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1. do HAGERMAN TECHNOLOGY Cornet Phono Preamp Kit User s Manual Cornet Phono Preamp Kit Manual 2 A A Warnings This product uses dangerous and potentially lethal voltages Extreme care must be taken while assembling this amplifier and should only be attempted by a skilled technician The instructions in this manual are a suggested guide only and no liability is assumed by Hagerman Technology LLC Copyrights amp Trademarks Copyright Hagerman Technology LLC 2002 2007 All rights reserved No part of this document may be photocopied reproduced or translated to another language without the prior written consent of Hagerman Technology LLC Disclaimer The information contained in this document is subject to change without notice Hagerman Technology LLC shall not be liable for errors contained herein or for consequential damages in connection with the furnishing performance or use of this material See Chapter 6 for warranty information Cornet Phono Preamp Kit Manual 3 1 Before You Begin Description Congratulations You have just purchased one of the highest performance per dollar audiophile products available The Cornet was designed to be a simple phono stage capable of achieving excellent sound quality The circuit topology consists of common cathode class A gain stages passive equalization and cathode follower output buffers Vacuum tube rectification for the high vol
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4. respectively two each Cornet Phono Preamp Kit Manual Component Qty 4TuF 450V 10 000uF 10V 470uF 10V luF 630V PP 100nF 400V PP 47nF 630V PP InF 630V PP 10nF 250Vac 1N5821 MJE340 Heat Sink Power Cord Ground Jack Standoffs 0 75 Feet AC Input Fuse Switch Res 220 1W mere MR RE Rr rFNNANNNNAANAMN ra Res 910 1W Res 3k3 1W Res 6k8 1W Res 10k 1W Res 47k 1W Res 150k 1W Res 330k 1W Res 1R8 5W RCA Jack R RCA Jack W Transformer Socket 8 pin Socket 9 pin 12AX7 12AU7 5AR4 U H NANG SAN R UM LV 00 Minimum quantity DigiKey AES 493 1461 ND 493 1275 ND PF4105 ND PF4104 ND P3517 ND P3497 ND P11423CT ND 1N5821DICT ND MJE340G ND HS216 ND Q120 ND J587 ND 4818K ND SJ5523 0 Q205 ND F2419 ND SW620 220W 1 ND 910W 1 ND 3 3KW 1 ND 6 8KW 1 ND 10KW 1 ND 47KW 1 ND 150KW 1 ND 330KW 1 ND 1 8W 5 ND S H267R S H267W P T370BX P ST8 193 P ST9 214 12AX7 12AU7 5AR4 References C2 Cx C10 C13 C14 C15 C16 Cx Cl C3 Cx C5 C7 C8 C9 C20 D1 D2 D3 D4 R6 R7 R8 R10 R11 R12 Ry R15 R17 Rx Rz R23 R2 R13 R20 RI R9 R14 R3 R5 R16 R4 R19 R21 V4 V1 V2 V3 Cornet Phono Preamp Kit Manual 6 3 Assembly Circuit Board Solder the sockets onto the backside of the circuit board This is the side without silk screening Make sure the orientation of the octal socket is correct Then install the six standoffs on socket s
5. es Turn on the power and check for smoke If all goes well after 60 seconds of warm up check to make sure the power supply and tube voltages are as specified on the schematic Check plate voltages on the 12AX7s as they should be around 140V If all is well power down and install bottom cover Connections Connect the Cornet just like any other phono stage The input and output jacks are RCA types Make sure the ground lead from the turntable is connected to the grounding screw between the input jacks Cornet Phono Preamp Kit Manual 10 5 Specifications The following specifications are subject to change without notice Item Gain Input Impedance Output Impedance RIAA Response Bandwidth 3dB Distortion SNR Overload Size PCB Size Chassis Input Power Tube Compliment Specification 43dB 47k ohm plus 40pF 1k ohms 1dB from 25Hz to 25kHz 15Hz to 30kHz minimum 0 02 1kHz 75dB ref 5mV A weighted 250mV 1kHz 5 25 x 8 50 12 x 8 33W 12AX7 ECC83 x 2 12AU7 ECC82 x 1 5AR4 x 1 Cornet Phono Preamp Kit Manual 11 6 Warranty amp Service Warranty Hagerman Technology LLC warrants this product free of defects in materials and workmanship for 10 years 90 days for tubes If you discover a defect Hagerman Technology LLC will at its option repair or replace the product at no charge to you provided you return it during the warranty period transportation charges prepaid to Ha
6. german Technology LLC This warranty does not apply if the product has been damaged by negligence accident abuse or misuse or misapplication has been damaged because it has been improperly connected to other equipment or has been modified without the express written permission of Hagerman Technology LLC This warranty is limited to the replacement or repair of this product and not to damage to equipment of other manufacturers Any applicable implied warranties including warranty of merchantability are limited in duration to a period of the express warranty as provided herein beginning with the original date of purchase and no warranties whether express or implied shall apply to the product thereafter Under no circumstances shall Hagerman Technology LLC be liable for any loss direct indirect incidental special or consequential damage arising out of or in connection with the use of this product Service Refer to Chapter 4 for troubleshooting information If the problem persists contact Hagerman Technology for service at http www hagtech com Hagerman Technology LLC PO Box 26437 Honolulu HI 96825 USA 808 383 2704 voice 808 394 6076 fax e Je 10 000U Hm GO 9 e x ee w e 470N e F 470N OE ee ou le ee e Jo o i Je e 5x e
7. ide Install all of the resistors and solder in place except R15s Use the guide in the back of this manual Don t forget to clip leads Repeat for the diodes signal capacitors and finally the large electrolytic capacitors Make sure the polarity of the electrolytics is correct is positive polarity Install R15s as shown below using the ground connection of the socket s pin 9 Use a wire for R22 C11 and C12 are unused but you can add small 100nF caps if you desire Add heat sinks to MJE340 transistors and solder in place as shown The heat sinks do not attach to board The metal part of the transistor faces away from the mickey mouse ears Cornet Phono Preamp Kit Manual 7 Finally add short lengths about 2 of signal wire to the input and output connections on the circuit board including ground Chassis Remove from plastic Apply rubber feet to bottom panel put aside Install grounding jack with ring terminal on inside Enlarge the RCA jack holes to 0 375 and install RCA jacks with their insulating washers White pair goes on left red on right Insert power switch and ac input connector Mount the transformer with 10 screws with washers between mounting tabs and chassis do not tighten yet with primary wires towards the outside Inside the chassis slide the AC voltage select board onto the screws Put on nuts loosely Ok now tighten down the screws from above securing the transformer in place Do not ove
8. r tighten or the washers will deform excessively Tighten the nuts holding the board down on the inside Finally solder C1 10nF 250Vac cap into place Replace the 8 bolts holding the transformer together with the supplied stainless steel types do not remove insulators Mount circuit board inside Cornet Phono Preamp Kit Manual 8 Wiring it up You can optionally use 1285K ND solder tabs and A27804 ND crimp terminals for wiring to the circuit boards This allows you to plug and unplug as in the photo above Normally you can solder wires straight to the boards Connect transformer secondary wires to the cornet circuit board The violet wire is unused Cut it short and insulate so that it touches nothing Connect the primary wires to ac voltage select board Refer to ac voltage chart on schematic for proper hookup Add ground wire from ac input connector to voltage select board Add neutral wire Add wire from line to power switch and then another from there to voltage select board Refer to schematic You can use tie wraps or tape to bundle wires together Keep primary wires separated from secondary Trim input output and ground signal wires to an appropriate length and solder to their respective RCA jacks and ground terminal Install tubes and fuse Unit is now ready for testing Cornet Phono Preamp Kit Manual 9 4 Testing 8 Installation Testing Double check all of your work before applying power Wear safety glass
9. tage provides a gentle turn on without the need for muting circuits The moderate gain accommodates all moving magnet and high output moving coil cartridges Features e All vacuum tube signal path e Pure class A amplifier stages e No feedback e Cathode follower low impedance outputs e Vacuum tube B rectification e Constant current sinks Tools This is a kit product and construction should only be attempted by skilled electronic technicians refer to warnings at the front of this manual You will need an array of shop tools and a good soldering iron If you are at all unsure of this send it back Cornet Phono Preamp Kit Manual 4 2 Parts to Buy Kit The Cornet kit does not need to be built as specified You may make any circuit and component changes you wish but you had better know what you re doing Feel free to substitute vacuum tubes or capacitor types A recommended parts list is given below Parts List This parts list is for a stock 43dB RIAA MM phono stage Parts should be ordered directly from www digikey com and www tubesandmore com AES Included with your box 2 kit are Cornet circuit board 1 AC voltage select board 1 Chassis 1 6 x 4 self tapping screws 20 Terminal ring 1 10 x 1 screws 4 10 nuts 8 10 rubber washers 4 8 x 1 75 screws 4 8 nuts 4 Upgrades Signal coupling capacitors can be improved substitute AES CAUD1 450 and CAU1 450 for CS and C6

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