Nov - The R-390A Frequently Asked Questions Page
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1. John Flood From peuhs at bellsouth net Fri Nov 12 20 57 22 2004 Subject R 390 new old chap I return after a long hiatus long omission or loss and I have been lost Even forgot where to go and had to seek help from the only friend I could find in a hurry I used to be jlap and my name is still John Hope I will still be welcome here From karlheinz at direcway com Sun Nov 14 10 34 16 2004 Subject R 390 Propagation question While the frequency is actually way beyond what our 39x radios do handle I hope someone here can answer this My satellite dish signal loss always occurs when a certain amount of precipitation is between the dish and the satellite transmitter I observed that a lightning discharge in the general direction of the satellite south will restore reception for about 2 seconds Could it be that the funnel of highly ionized air acts like a reflective medium the same way that allows round the world HF transmission to be possible by the ionizing layers in the upper atmosphere Thanks for any enlightenment From djmerz at 3 cities com Sun Nov 14 13 55 09 2004 Subject R 390 Testing Hi server seems fine conditions for propagation are hindered by sluggish keyboard in the 390 band I ve been on a different band discussing 6BE6 converter tube grid blocking greater than 50 volts positive 6 appearing on the G3 grid when operating with too high G2 G4 voltage Does this ring a bell with anyone If not let2. I m having problems in finding out what tool to use Those darn small screws are hard to see especially at my age I was able to determine with an 8X magnifying glass that the cap screw is an Allen head cap screw The smallest allen wrench I have is 028 and it fits but jumps when I try to turn the screw I have no idea what standard sizes allen wrenches come in 1 16 is way to big 1 32 is 032 but that does not seem like too much of a difference from the 028 that I have Anybody know what size wrench I should be looking for 73 Bill K3PGB 12 From roy morgan at nist gov Mon Nov 22 17 16 48 2004 Subject R 390 Cosmos PTO adjustment wrote gt I m tackling the Cosmos PTO for linearity adjustment I think the Cosmos PTO s I have here use screwdriver slotted screws for the linearity adjustment gt I have no idea what standard sizes allen wrenches come in Check http www engineeringfindings com cat22 cat22pg364 pdf Small Parts Inc they seem to come in 28 35 and 50 thousandths Roy From wabate at dandy net Mon Nov 22 17 54 22 2004 Subject R 390 Cosmos PTO adjustment Roy Thanks for the info It looks like I need the 035 unless it is a non standard size which I doubt I have a friend checking for one Hope he can come through Also it is my understanding that the Cosmos PTO used allen slotted hear and bristo head cap screws for the linearity adjustment Go figure At least they didn t use them all on the same PTO H
3. R388 and my Icom PCR 1000 just to see how each performs on the same signal and antenna But mainly I ve been remembering how it was on cold winter evenings with my National NC 200 which I still have though it need much TLC and my long wire made up of every longish scrap of copper I could find old lamp cords fence wire phone cables going to school the next day with my log and it s newest entries to compare with my other nerd buddies who had Hallicrafters Allied Star Roamers hand me down Mil gear near the end of 9th grade I got a ratty old Viking mono tape recorder and immediately used it for recording my SWL activities for a while tape was my main expense in life It would be such a very cool thing to have those reels now but they re long gone Also I ve been doing some digital listening and using the Dovetron and Models 28 and 19 to print but there s not much unadorned 5 level out there anymore O well So you asked Cheers John KB6SCO From ham at cq nu Wed Nov 3 22 10 26 2004 Subject R 390 Re What s in YOUR RF Amps 1 Hi I would say that back in the good old days as in pre high school the main things on the air that I noticed 1 Radio Netherlands 2 Radio South Africa 3 The boys and girls in Moscow 4 The beeb I actually hate to admit it but the most fun was with an old Philco five tube radio My first R 390 just made things to darn easy Of course then I made it into high school and there were other
4. what is the capacitance Mine won t oscillate so I m trying to find a replacement Also what was the purpose of reducing the 2400 pf caps in the two 05 1 0 MHz cans to 1500 pf Thanks Fred WAOGMH From drewmaster8 13 at hotmail com Mon Nov 15 13 18 02 2004 Subject R 390 RE 3TF7 resistor replacement Charles B wrote gt Can some one give me the specifics on how to replace the gt 3tf7 Ballast tube with a 42 OHM resistor lt snip gt Bob Camp responded gt Alternately you can solder the resistor to the tube socket pins under gt the IF module lt snipped gt That is neat and unobtrusive but will add almost 4 watts of heat under the IF module Baked BFO anyone Bruce MacLellan responded gt I had a ballast fail on me last night I replaced it with two Two 51 ohm resistors in parallel is about 25 ohms that value is too low The desired value is 42 ohms A 47 ohm resistor will work A sufficient power rating is 5 watts a 10 watt unit would run cooler and be less of a tempation on which to burn your fingers Bruce wrote of MOV s from Mouser I believe he meant MOX metal oxide power resistor Methinks the simplest ballasubstitution to be swapping out the PTO and BFO tubes with 12BA6 then jumper out the ballasocket No resistor required An Alfred E Neuman impostor attempted to kick the beehive by writing gt I have heard from various experts that if one were to do this when gt somebody gt turns a light switch on in
5. 22 2004 Subject R 390 Framingham MA Flea report Nov 8 New R390 Greetings This is a small but usually well attended flea that is put on by the Framingham Amateur Radio Assoc two times a year spring and fall John gt From CT forgot his last name was there with some spare parts PTO knobs gears Next to him a someone had driven up from NY with a good looking R 390 URR a 51 for Collins and it was looking for a new home It had meters top cover power cord with connector all internal covers and a good looking engraved front panel It was stated that it was working and in current use Asking price was 500 Fair considering the going price in E land As the morning went on and I sold a few things I started offers At the end of the show I had 425 in hand and just enough left over to pick up the favorite coffee for she who must hold the door open and let it pass incoming inspection I was lucky enough to convince the seller that although less than he wanted with todays high fuel costs the elimination of about 100 pounds of ballast would help to reduce fuel consumption and help to offset the difference Powered up at home it seemed to overload on some of the local BC stations A quick adjustment of the gain control helped that and then the AGC was AG ing again I let it run on a local station a few hours and after getting the kids to bed started tuning around HF Not much heard Tried the BBC on 5975 and found them weak Got depressed
6. From bhagen at msn com Sun Nov 14 22 03 41 2004 Subject R 390 3TF7 The Amperite TJ311M01 is suppose to be a direct sub for the 3TF7and is still available from some internet tube merchants Bruce From brumac at juno com Bruce MacLellan Date Sun Nov 14 19 07 59 2004 Subject R 390 3TF7 resistor replacement Charlie I had a ballast fail on me last night I replaced it with two 51 ohm resistors in parallel inserted into 2 and 7 socket positions Use 2 watt or better A bit of shrink tubing on the leads will keep them away from the socket shield mount If you don t have carbon you can get MOV s in 3 and 5 watt values from Mouser It works well for me Bruce From wabate at dandy net Sun Nov 14 23 04 28 2004 Subject R 390 Front Panel Lerttering I have a 390A that I think was manufactured around 1957 by Motorola The front panel is a blue green 7 color original to the primer which I think is for the Navy The front panel is engraved and the lettering is black This surprised me as I thought it should be white lettering I repainted the panel and was getting ready to fill in the engraving with black when I saw a picture of an identical one on the internet with white lettering Which is right Or are both original Anyone have any ideas Thanks Bill K3PGB From flderoos at mmmpcc org Mon Nov 15 07 28 17 2004 Subject R 390 R390A 200 KHz Calibration Crystal Is the 200 KHz calibration crystal series or parallel resonant If parallel
7. at that point and went to bed The baby was crying at about 4 00AM and when I went in to sort things out I was wondering why the sun was coming up so early It turned out to be an aurora The baby and I checked out the light show and other radios on HF and they were dead as well I guess things are OK after all One thing I have noticed is that the tuning seems to be offset a couple of kHz depending of the filter settings Is this a sign of impending doom Now that I have some experience on the A It s nice to get this one as well The main question is should this go on top of or below the 67 EAC R 390A URR in the rack John Flood KB1FQG 7 Dearborn Rd Peabody MA 01960 Tel 978 535 6060 800 356 9464 Fax 978 535 8180 From ai2q at adelphia net Mon Nov 8 13 45 35 2004 Subject R 390 Framingham MA Flea report Nov 8 New R390 John Go through the entire alignment and you ll see what s needed Good luck with it Vy 73 AI2Q Alex in Maine From mikea at mikea ath cx Mon Nov 8 13 51 26 2004 Subject R 390 Framingham MA Flea report Nov 8 New R390 wrote gt Greetings Wherever you put it do please make sure it has some support from the back and ditto for the R 390A supporting them from the front panel only is A Bad Thing I m mounting mine on angle iron or 4 90 aluminum extrusions lust to make sure I don t stress the gearing There s not a whole lot to be done when the Wendigo is walking you might be lucky to pick up loca
8. distractions The radio dial has changed a bit over the years Used to be a lot of five level code out there Enjoy Bob Camp KB8TQ From ka4prf at us it net Thu Nov 4 08 32 45 2004 Subject R 390 J104 Hi all Is there anywhere in the world where I can get the connector for J104 either the UG 421 U or UG 969 U Please advise Thanks Chuck ka4prf us it net From mikea at mikea ath cx Thu Nov 4 09 43 33 2004 Subject R 390 J104 If you re talking about the non A R 390 power connector they are pretty scarce You might look for the entire power cable CX 1358 U as an alternative search key Also call Rick Mish in Toledo he s in the phone book or was or try E mail to him at radiomon accesstoledo com Mike Andrews From dhallam at rapidsys com Thu Nov 4 10 16 15 2004 Subject R 390 J104 Hi Try Bill Perry at William Perry Co 502 893 8724 They have all kinds of surplus military connectors among other things The power cords also show up on eBay occasionally 73 David C Hallam KC2JD From eldim at att net Thu Nov 4 11 40 19 2004 Subject R 390 J104 Okay talking on the subject of the R 390 Can anyone tell me if the two wire tube pullers on the rear accessory rack have Part Numbers Stock Numbers and oif they are listed in the R 390 Manual which I donot have a copy of I saw a picture in one of the Operators TM What exactly is the UG 421 U I found it listed in the FEDLOG but did not find the UG 969 U listed I though
9. there be no further propagation on this subject in the band I ll continue on the band I ve been using My 390a is getting dusty recently best regards Dan From chacuff at cableone net Sun Nov 14 16 19 04 2004 Subject R 390 Propagation question The cause of your dish loosing signal is rain attenuation The signal is blocked by enough water that the level that does get through exceeds the bit error rate of your receiver My guess is the lightning vaporizes the water in it s path and momentarily reduces the amount of water between your antenna and the satellite transponder causing an increase in signal strength and a resulting reduction in bit error rate to just below your receivers threshold Of course that s just a guess it could also just be coincidence Cecilx From ka4prf at us it net Sun Nov 14 16 52 12 2004 Subject R 390 3TF7 resistor replacement Can some one give me the specifics on how to replace the 3tf7 Ballast tube with a 42 OHM resistor I am wondering where the resistor leads are placed in the tube pin holds etc Any help would be appreciated The resistor goes between pins 2 and 7 Page 115 in the Y2K manual Chuck From Llgpt at aol com Sun Nov 14 18 37 27 2004 Subject R 390 3TF7 resistor replacement I have heard from various experts that if one were to do this when somebody turns a light switch on in any part of the house the receiver will change frequencies Can you confirm or deny this Alfred E Neuman
10. 23 12 27 57 2004 Subject R 390 BFO Pitch wrote gt Hi again gt gt I had the IF subchassis out of my R390A last week to check gt underneath to see if there were any problems i e burnt Pitch WITHOUT instruments gt before connecting it back onto the knob What has always worked pretty well for me is to set the selectivity at one of the narrower positions but usually not the narrowest tune in a place with NO SIGNALS turn the BFO on turn up the RF and AF gain so I can hear a lot of band hiss and adjust for lowest pitch Ken W7EKB From wabate at dandy net Thu Nov 25 20 58 33 2004 Subject R 390 Schematic I found a pdf of the R 390A manual on the net but the schematic is cut up into 8 1 2 X 11 pieces Does anyone know where I can DL a full size version of the two schematics Thanks Bill K3PGB From tetrode at comcast net Fri Nov 26 13 51 49 2004 Subject R 390 Schematic Bill Check out James A Moorer s R390 page at his Jammin Power site there are full size hi rez schematics in the PDF file named TM 11 856A wide PDF which is the second one from the bottom in the R 390 literature section It s a 32MB file but if you like R 390s then your used to big things The schematic looks good even at 400 size http www jamminpower com main r390 jsp IMHO James deserves a big thankyou from everyone in the boatanchor community His freely available high rez manual scans are obviously a labor of love and its his own dime host
11. I HI 73 Bill K3PGB From ka4prf at us it net Tue Nov 23 05 45 36 2004 Subject R 390 BFO Pitch Hi again I had the IF sub chassis out of my R390A last week to check underneath to see if there were any problems i e burnt resistors etc There weren t Anyway I had inadvertently turned the BFO Pitch shaft when it wasn t hooked up and consequently I think my pitch maybe off Anyone know the proper procedure for adjusting the Pitch WITHOUT instruments before connecting it back onto the knob Thanks Chuck From kc8opp at yahoo com Tue Nov 23 06 41 50 2004 Subject R 390 BFO Pitch Charles Tune in a known freq station WWV works good If your dial is set right it should read XX 000 depending on the freq Tune for max carrier level at the lowest bandpass possible to make sure your centered on the freq Turn on the BFO and zero beat Should be 0 on the BFO dial Comments welcome 73 s Roger KC8OPP From kc8opp at yahoo com Tue Nov 23 08 56 20 2004 13 Subject R 390 Cosmos PTO adjustment Bill Here is what I found and it fits a couple of the PTO s that I have been into Some of them have slots for a tiny jewel screwdriver bit but then there is the allen type Contact your Snap On dealer and order up MS2A this is a multi spline L shaped wrench Four flutes at 033 inches When it comes in take your magnifier with it is very small Good luck and let me know what you find 73 s Roger KC8OPP From kgordon at moscow com Tue Nov
12. R 390 Reflector November 04 Edited From drewmaster8 13 at hotmail com Mon Nov 1 13 17 37 2004 Subject R 390 R 390 Problems Update wrote gt With just a paper clip jumper you may be putting too much voltage on the gt BFO gt and VFO tube filaments A 22 ohm 5 10W resistor is preferred lt snip gt The transformer winding supplying the PTO and BFO tube heaters supplies nominally 25 2 VAC In the original configuration the ballastube drops about 12 6 volts leaving 12 6 volts for the seriesed 6BA6 tube heaters in the PTO and BFO With Two 12BA6 and a Paperclip 25 2VAC is applied to the seriesed 12BA6 tube heaters in the PTO and BFO Each 12BA6 receives its rated 12 6 volts No additional series resistance is required That is the simplest Ballasubstitution 12BA6 is probably the most common tube ever made being the IF tube of choice in millions of radios with the All American Five tube lineup No trouble finding those Drew From ka6uup at pacbell net Mon Nov 1 14 50 56 2004 Subject R 390 Re R 390 Digest Vol 6 Issue 26 Check the 3TF7 ballast tube Chuck From jpl15 at panix com Wed Nov 3 21 51 47 2004 Subject R 390 What s in YOUR RF Amps wrote gt Hi gt snip gt gt So what stations are people listening to these days gt Now that I m approaching my dotage 52 I ve been reliving my childhood by working the SW worldwide broadcasts especially HCJB R Duetschland even R Habana Cuba on the R390 the
13. Yours doesn t count From terryo at wort fm terracom net Tue Nov 16 10 31 50 2004 Subject R 390 FS Mini BNC stuff I have an assortment of mini BNC cables connectors and parts I no longer need Quantity discounts if you d like a bunch Just make me an offer Here s what I have 6 RG 174 cables of mini BNC male to cut end that are 6 8 feet long These are 3 00 each 5 RG 1428 U same size as RG 58 cables of mini BNC male to cut end that are 3 6 inches long These are 1 50 each 3 RG 174 cables of mini BNC male 2 straight 2 right angle to cut end that are at least 6 long These are 1 25 each 1 RG 1428 U same size as RG 58 cable of mini BNC female to cut end that is 3 long 2 00 for this one 15 RG 174 cables of mini BNC male to standard BNC male various lengths 8 16 long Make great test leads for troubleshooting the modules in the radio 1 00 each 2 RG 174 cables of mini BNC male to standard BNC female about 7 long These are 1 50 each 1 RG 174 cable of mini BNC male to standard TNC male about 12 long 1 00 for this one 2 cables of mini BNC male to standard BNC female one of RG 55 about 16 one of RG 58 about 8 long These are 1 50 each 3 RG 174 cables of mini BNC male to right angle mini BNC male about 12 long 1 25 each 2 RG 174 cables of mini BNC male to right angle mini BNC male about 5 long 1 00 each Original R 390 with tags P114 and P116 at each end Jackets on cables
14. any part of the house the receiver will change gt frequencies Can you confirm or deny this In this rushing about hither and thither busy busy busy age many of us just don t have sufficient time and energy to kick about a good ol dead horse and play the controversies Wei i Li has recognized that unfortunate hallmark of present day life and has given us powerful freeze dried knowledge comprising tidbits coursing through this forum over the years complete with all of the high spirited equine percussion for which one could ask Goto r 390a net click on references Pearls of Wisdom Ballast Tube then just add water Drew From bhagen at msn com Mon Nov 15 17 25 41 2004 Subject R 390 The ballast still Yikes The simple mod is change the two tubes to 12ba6 s and jumper the ballast with a U made from a paper clip which is the David Medley way Ten minutes and less than 5 00 and in ten minutes you can reverse it if you think it gives the audio too much bass Bruce From bill at iaxs net Mon Nov 15 21 39 00 2004 Subject R 390 The infamous or notorious Ballast Tube What s all this about infamous and notorious These are euphemisms Obviously the ballast tube is immoral It cannot be born again It has nothing to say to the unborn fetus and it does not have an opinion about gay marriage The will of the people has been made manifest Let us have no more talk about immoral ballast tubes William Hawkins Defender of My View of the Faith
15. email was bounced back Anyone know if this unit is still available and if not is there a simular modification around that I can get my hands on Thank you Chuck B From kgordon at moscow com Mon Nov 22 00 29 45 2004 Subject R 390 Operating Hours MTBF Bob Camp wrote a while back gt The list has been a bit quiet recently Again so I ll resurrect an older post gt Here s my question How much do you operate your R 390 and how long gt does it operate between maintenance events lt snip gt gt So any body want to contribute to the data base Sure Although this isn t an R 390 I ran an RAL 7 for 6 years without ever turning it off Finally thought I better check for flat tubes in it so shut it down to check them Didn t find any so turned it back on for another 4 years Finally I discovered that the rectifier tube had gone really gassy when I noticed some tar running out of the power supply I replaced the tube and also turned off the big 300 watt ballast tube 876 which wasn t really needed in the first place 10 So that was about 87000 hours MTBeforeF Not too shabby Ran it for another 2 or 3 years after that then turned it off when I left home So now 35 years later I have another one Wonder how long it will last Ken W7EKB From ka4prf at us it net Mon Nov 22 05 55 04 2004 Subject R 390 SSB unit Hi all someone told me that there s an outboard unit that allows one to receive LSB amp USB better w
16. ing the bandwidth for all those huge files too 73 John 14
17. ional features beyond just adapting to SSB There were lesser units on the amateur market but the didn t last long One great thing about the B and W was a front mounted speaker of high quality But then all their gear was great 73 Frank Gilmore KOJPJ ex W5PVX From ai2q at adelphia net Mon Nov 22 12 42 20 2004 Subject R 390 Baker and Williams I have a Hammarlund HC 10 hitched to my 51J 4 If someone s interested and makes me an appropriate offer I might be persuaded to part with it I even have the original owner s manual Vy 73 AI2Q Alex in Maine From N4BUQ at aol com Mon Nov 22 12 42 23 2004 Subject R 390 Baker and Williams and the little PD 1 solid state unit I have one and it works pretty good Barry III N4BUQ From Llgpt at aol com Mon Nov 22 14 12 43 2004 Subject R 390 Baker and Williams Alex and group Why not just do the Lankford age and product detector modification I have that on my 51J 4 and it works spectacularly The age mod takes care of the crappy audio when listening to fading sw broadcasters and the product detector is superb No need to vary the bfo as it is a true product detector center the bfo in the passband and listen away to USB or LSB with equal ease The articles were in HSN 26 and HSN 28 Les Locklear From wabate at dandy net Mon Nov 22 15 29 15 2004 Subject R 390 Cosmos PTO adjustment I m tackling the Cosmos PTO for linearity adjustment I have Dave s article on how to do it but
18. ith his R 390A He said that it was made by Barker amp Williamson Anyone know the email or URL of B amp W I would like to investigate the unit mentioned thanks Chuck ka4prf us it net Chuck The B amp W unit is the Model 370 Single Sideband Receiving Adapter It operates on the frequency conversion principle with its low IF frequency at 17 to 20 Kc Upper or lower sideband is selected by changing the mixing frequency A filter at 17 Ke selects the desired band of frequencies There is a 17 Ke injection oscillator to re inject the BFO signal for SSB CW or enhanced am operation The thing contains an audio amplifier 6V6 and speaker These units seem quite hard to find I have one one other fellow I know of has one also I also have an original manual and will be happy to provide copies of it to anyone who needs one it is not on the BAMA site When I get the time I ll scan it and send it in for all to have Other sideband adapters that can be used with the R 390A or other radios with 455 kc IF frequencies include Hammarlund HC 10 quite rare and expensive Hammarlund SPC 110 rack mount equivalent even more rare and expensive Military CV 591 aka MSR 4 made by TMC sideband adapter Any modern rice box that will receive SSB and tune to 455 Kc Roy From klycotek01 at mchsi com Mon Nov 22 11 48 57 2004 Subject R 390 Re B and W SSB Adaptor I sold those when I was a B and W dealer and later a lot of used ones came through the do
19. l BCB stations when it s really severe Do keep us posted on the R 390 please Any word on the T 827 That was my point actually in some Amerind First Nations Native American tales the aurora borealis is associated with the Wendigo being on the prowl not someone something you want to encounter Hence my reference to the Wendigo walking Roy From ba williams at charter net Mon Nov 8 23 00 29 2004 Subject R 390 Framingham MA Flea report Nov 8 New R390 John If you are talking about SSB tuning this sounds normal The Operators Manual shows how to set the BFO depending on the filter selected and either USB or LSB In a nutshell you set the BFO half the filter width For example you use 2 on the BFO for the 4 kHz filter Good catch on the radio Barry From hcjoel at direcway com Tue Nov 9 12 10 57 2004 Subject R 390 Off Subject Help My beloved HRO S5OTI receiver did not turn on last night No filament power Looks like power tranformer is kaputt Any suggestions were I might find a replacement Thanks From nhoj at epix net Wed Nov 10 13 43 33 2004 Subject R 390 HRO trans Harry It is unlikly the winding opened up Check closely for bad connection I just replaced a trans in a HRO 60 and added an extra 6volt trans for the fancy fil circuit Good luck John K30PC From redmenaced at yahoo com Wed Nov 10 19 15 42 2004 Subject R 390 Oh NO MARS left overs What happens to radio equipment from the MARS when
20. ned to cold and windy New England I ve been doing some listening of the tropical shortwave bands so I can hear some more of that soft Latin American beat and reminisce The long winter nights and reduced static make for good listening conditions on the lower freqs so now s the time to do some DXing there And the tubes in the radios also help keep the room warm too The tropical bands are considered Mhz Meters 2 30 2 55 120 3 15 3 45 90 4 70 5 15 60 So far I ve heard no broadcast on the 120 meter band and from what I ve read it seems a lot of station that were once there have moved to the 90 and 60 meter bands for increased coverage and better listening during QRN Last night I heard stations on 5025 Cuba loud 4990 4915 4885 Brazil nice music 3291 3280 3250 There were a few other stations too such as the domestic bible beaters and some chatter on 2552 USB as well but I wasn t interested in this stuff More stations should become listenable as conditions improve too Here s a few links to checkout the freq list is very useful for station ID help as most language is non English http donmoore tripod com genbroad tropical htm http www hard core dx com nordicdx dxlab latinam4 html http www sover net 7Ehackmohr sw htm freq list 73 John 3 From kherron at voyager net Mon Nov 8 09 02 30 2004 Subject R 390 Fwd Drake Fwd Bristol Driver and Allen Driver set for sale From flood at Krohne com Mon Nov 8 13 11
21. on brittle and flaking 5 RG 174 cables of mini BNC male to mini BNC male one 12 long and four 5 1 25 each 13 female mini BNC panel mount connectors by Amphenol Removed from equipment 1 00 each 3 mini BNC coaxial relays SPDT with 115VAC coil winding 3 00 each Small amounts of cables can be crammed in a 3 85 priority mail flat rate envelope For quantities and the relay s I ll have to pack up and get a quote 73 Terry O WB9GVB From stevehobensack at hotmail com Tue Nov 16 18 46 53 2004 Subject R 390 200 khz crystal Hash SHA1 Fred my crystal went on the fritz also but I managed to repair it I opened the can and removed the 200 khz crystal I opened the crystal and found one of the fine wires came off the quartz due to some kind of green corosion The wire was too short to reuse so I used a piece of nr38 copper wire that I cut and bent to size I filed a find point on my iron and tack soldered it in It wasn t pretty but it worked Some types of those crystals are really fragil because the fine wires actually suspend the crystal in space instead of the normal pressure plate type of contact 73 Steve N8SYE From ka4prf at us it net Wed Nov 17 09 59 05 2004 Subject R 390 Solid State replacement Hi again On Chuck Rippel s web page he has a Solid State Replacement modification for the Ballast Tube introduction printed He says anyone interested in purchasing this unit should email him which I did and my
22. ors when fully SSB receivers came along There were several similar units popular in early 60s and prior B and W was a no nonsense unit that worked very well and was a companion to the 5100B transmitter and 51SB SSB Adaptor Add one to a 75A3 or similar and you had a great receiver Lakeshore Eldico and Central Electronics made various models with various results Most of the Central units were in kit form and I had to rework so many I quite taking them in trade as did my friend Bob Henry The jewel that people wanted but was rather expensive was the Hammarland HC 10 and SPC10 9PC was rack mounted It was literally the whole front end if strip and all from a HQ 170 180 with the excellent SSB system stagger tuned IFs and other features Being a Hammarlund dealer I sold them 11 as fast as I could get them many went on NC300s and 303s I put one on an AR 88 and it is still there Also used others on a my R388 and R390A and a couple of commercial receivers But when all is said and done the TMC strip rack panel adaptors were a terrific bargain when several surplus stores were selling them for 50 I bought four and three had off freq crystals they had your choice of variable tuning or crystal controlled USB LSB I bought a handful of crystals from International and made them do what they were supposed to do Still have one and like it for it s simplicity A natural with the R390A Sooo it is all in what you are looking for in addit
23. t that these were RF Connectors Is that the funny screw on POWER CONNECTOR If so then I stand corrected 73 Glen Galati KA7BOJ Tacoma WA eldim att net From brookbank at triad rr com Thu Nov 4 12 21 32 2004 Subject R 390 J104 and tube pullers On the subject of tube pullers talk to your local chiropractic and or orthopedic doctor the use them to place fingers in traction They work great on tubes also Pat From dps4 at juno com Thu Nov 4 14 42 47 2004 Subject R 390 J104 I bought the tube pullers from Fair Radio a couple of years ago They called them military tube pullers small and large As I remember they were reasonable 2 00 each David Seckel W8GWI From tetrode at comcast net Sun Nov 7 18 53 49 2004 Subject R 390 Tropical Band listening Well let s see if this gets through without bouncing this time have had a heck of a time trying to reply to this thread What s in your RF Amps Being that I just returned from an Aruba honeymoon I have very fond memories of our trip Warm aqua ocean no hurricanes palm trees bikinis the westerly growing divi divi trees white sandy beaches more bikinis friendly folks mostly friendly wife and the delightful aroma of fine food 30 sunscreen and Cuban cigars I tried a little DXing of the 120 meter band with a Sony portable I brought along but I didn t know quite where to tune so I didn t hear anything and really wasn t trying too hard either So now that I ve retur
24. the operator dies Especially if the Army won t come to get it Joe From stevehobensack at hotmail com Wed Nov 10 20 32 41 2004 Subject R 390 HRO 50t1 power transformer Hash SHA1 Harry you can run the revr from outboard power until you find a suitable replacement the b voltage doesn t have to be exact You can remove the bad transformer remove the end bells and examine for shorts opens etc I just got a flyier from Fair Radio They have a variety of power transformers Peter Dahl can hand fabricate a replacement Good luck 73 Steve N8YE 5 From ham at cq nu Wed Nov 10 21 00 01 2004 Subject R 390 Oh NO MARS left overs Hi Well I suspect a lot depends on the survivors I guess that 90 or the time it winds up in the dumpster Certainly a significant part of what s left goes up for sale There are disposal regulations on the stuff but I doubt anybody cares as long as it s not exported I d say it s fair game Take Care Bob Camp KB8TQ From flood at Krohne com Thu Nov 11 14 11 54 2004 Subject R 390 Framingham MA Flea report Nov 8 New R390 Thanks for all of the replies Hope to start the alignment this weekend I ve already found out the hard way that the dial lamps are 28 Volt not the 6 volt of the A However for a split second the dial was very bright My five year old son who thinks the radio is great because of the army reference on the data tag said Do that again Daddy Perhaps I should read the manual
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