VK-P12SE Manual - Balanced Audio Technology
Contents
1. and S202 3 Gain switch S2 The following section describes the operation of these controls gt t D x ai ve B Susosgu Sveuecosgw Lopes tre I ses oe 2 2 a a INPUT g viet uze1 i z HIGH N Z V102 sz ig V202 LOW Figure 1 Cartridge loading switches 101 and S201 Resistance The 47K load resistor is permanently connected to the cartridge input If a different loading value is desired it can be obtained by switching in additional resistors installed on the VK P12SE PC board This is accomplished by using the two DIP switches 101 and S201 that allow multiple choices for resistive and capacitive cartridge loading Four positions are reserved for the choice of resistance and four for capacitance Out of each group of four one position is loaded with female pins and allows the user to install any desired value component this position is marked USER Gold plated solderable pins are supplied with the VK P12SE accessory kit that should be attached to either resistors or capacitors supplied by the user This allows for easy installation and upgrade of user supplied components The following resistors can be added in parallel with the 47K load Switch position Resistor Value 1 100 Ohm 2 1K 3 10K 4 User Defined Any parallel combination of the these values is also allowable Capacitance Various values of capacitors can be connected in parallel to the input via switches 102. 1 and S201 With these switches in the OFF position there is no capacitive loading to the cartridge The capacitance choices include Switch Position Capacitor Value 100pF 470pF 1000pF User Defined CON DWI Any possible parallel combination of these values is also allowable Input Mode Direct or Step Up Switch The VK P12SE comes equipped with internal step up transformers which allow the user to achieve the best possible signal to noise ratio and dynamic range in any system configuration including systems with very low output moving coil cartridges down to 1mV or less By changing the position of the 102 and S202 switches user may choose between Direct and Step Up input modes In Direct mode the cartridge is connected directly to the vacuum tube amplification stage In the Step Up mode the cartridge signal is routed through the step up transformer in order to boost it before it reaches the amplification stage This allows for an additional gain of 2OdB It is recommended that for phono cartridges with the output of more than 25mvV the Direct mode be used For sources with lower output voltage the user should experiment in order to find the combination providing the best performance Using the Step Up transformers will usually provide a lower noise floor see the Specifications chapter Gain Switch By moving the switch S2 from High to Low position the amplifier s gain is reduced by about 15dB While the High
3. change specifications at any time without obligation or liability to previous purchasers 7 Miscellaneous Any implied warranties relating to the above product shall be limited to the duration of this warranty This warranty does not extend to any incidental or consequential costs or damages to the purchaser This warranty gives you specific legal rights You may also have other rights which vary from state to state
4. eferenced to 1mV Low position 75dB High Position 78dB With Step Up 86dB Absolute Polarity panel Cartridge Loading Resistance Capacitance to 1000pF Inputs XLR Outputs available Tube Complement 4 6C45 s Power Consumption Dimensions D Weight Selectable through front switch Selectable from 100Q to 47kQ Selectable from 100pF Two sets one RCA and one XLR Balanced XLR to RCA adapters 4 6922 s 2 6SN7 s and 150 VA Max 19 W x 5 5 H x 14 35 Ib unpacked Five Year Limited Warranty Terms and Conditions 1 Limited Warranty Upon receipt of the attached warranty registration form Balanced Audio Technology warrants the purchased product to be free from manufacturing materials and workmanship defects for five years from date of original purchase excepting vacuum tubes subject to the following conditions Failure to return the enclosed registration form within 30 days from original purchase will result in a warranty period of one year from the date of manufacture 2 Vacuum Tubes Vacuum tubes including replacements under warranty are warranted for one year from the date of the original VK P12SE purchase 3 Limited to Original Purchaser This warranty is for the sole benefit of the original purchaser of the covered product and may not be transferred to a subsequent purchaser of the product 4 Conditions and Limitations This warranty is subject to certain cond
5. es through exactly the same signal path elements and components Output Muting The output of the VK P12SE phono stage has a mute relay that disables it for about 45 seconds every time the unit is turned ON When the unit is powered up it automatically self mutes until the proper operating points of the circuitry are reached It will then go into normal play mode Changing the power switch position from ON to OFF even for short time will make the unit reset its power sequencing circuit and mute its output t will then require about 45 seconds for the unit to become operational again Configuration Switches WARNINGS Please make sure that the VK P12SE is turned OFF and your preamplifier is in MUTE before changing the state of any internal configuration switches in VK P12SE Hazardous voltages are present on the unit s printed circuit board DO NOT operate the VK P12SE with its top cover removed This section describes the setting of internal configuration switches that are located inside the VK P12SE phono preamplifier In order to access these switches do the following 1 Turn the VK P12SE OFF and disconnect the power cord from the power line receptacle 2 Remove the top cover using the supplied Torx T 10 wrench Figure 1 depicts the locations of the VK P12SE internal configuration switches These include 1 Left and right channel cartridge loading switches 101 and S201 2 Direct Step Up input mode switches 102
6. gain position provides the most universal setting it may be desired to reduce the overall system gain when using some high output phono cartridges Fuse Protection A blown fuse in the VK P12SE is an indication of a serious problem If a replacement fuse fails as well no further attempts should be undertaken Please contact the factory for professional service The proper fuse ratings are as follows For 100 120 VAC Units 2A 250V Slow Blow For 200 240 VAC Units 1 5A 250V Slow Blow WARNING Factory supplied fuses should be only replaced with the same type and rating parts Servicing The Balanced Audio Technology VK P12SE should require no service other than changing tubes to maintain its high performance The vacuum tubes used in the VK P12SE are high quality 6922 s and 6SN7 s rated for approximately 5000 hours of use Please direct any further service inquiries to the factory Cleaning To remove dust occasionally wipe the front and top surfaces of your VK P12SE with a damp soft cloth If fingerprints appear you may use a mild non alkaline soap solution Do not use abrasive cleaners as they may damage the fine finish of the unit VK P12SE Specifications Total Energy Storage 200 joules Gain at 1kHz The following user selectable values are available Input Mode Switch Gain Switch Gain Direct position Low 44dB High 59dB With step up Low 64dB High 79dB Signal to Noise Ratio A weighted r
7. itions and limitations as follows This warranty is void and inapplicable if the product has not been used in accordance with the instructions found elsewhere in this manual or if it has been misused or abused damaged by accident or neglect or in transport once in possession of the purchaser The warranty is also void if the product has been repaired modified or tampered with by anyone other than Balanced Audio Technology or its specifically authorized agents 5 Remedy If this product contains a materials manufacturing or workmanship defect that cannot be repaired at the dealership where the product was purchased it must be packed in original packaging and returned to Balanced Audio Technology via insured freight at the owners expense If replacement packaging materials are required they will be supplied by the factory at a nominal charge Returned products must be accompanied by a written description of the defect and a return authorization number available from the factory via phone or fax Upon receipt of defective product Balanced Audio Technology agrees to repair the product without charge for parts except vacuum tubes if the unit is more than one year old or labor The product will then be returned via prepaid insured freight with carrier at the sole determination of Balanced Audio Technology This constitutes the purchasers sole remedy 6 Design Changes Balanced Audio Technology reserves the right to modify its products or
8. p_i T Balanced Audio Technology VK P12SE WARRANTY REGISTRATION FORM Unit Serial Number Purchased From Dealer Name IMPORTANT NOTE In order to receive the full five year product warranty please mail this completed form together with a copy of your sales receipt to Balanced Audio Technology at the address below within thirty days of purchase Failure to do so will result in the product being warrantied for one year from the date of manufacture 1300 First State Blvd Wilmington DE 19804 Tel 302 999 8855 Fax 302 999 8818 p_i T Balanced Audio Technology VK P12SE Special Edition Balanced Phono Stage Owner s Manual 1300 First State Blvd Wilmington DE 19804 Tel 302 999 8855 Fax 302 999 8818 NOTE Your VK P12SE Phono Preamplifier was preset at the factory to the following configuration Input Mode Direct Gain High Input Resistive Loading 47kQ Input Capacitive Loading None Please refer to the chapter on configuration switch setting for information on optimizing the unit parameters Introduction Thank you for your purchase of the Balanced Audio Technology Special Edition VK P12SE balanced phono stage Please read this owner s manual to obtain the full benefit of the VK P12SE in your system It will provide you with the needed safety information and operating procedures for this exceptional unit WARNINGS To prevent the possibility of serious injury electrical shock or fire DO NOT o
9. perate with the cover removed DO NOT expose to rain or moisture DO NOT defeat the ground power plug DO NOT replace fuse with anything other than the same type and rating as supplied by the factory Package Contents Included in the box should be the following Description Quantity VK P12SE Balanced phono stage 1 Power Cord 1 Spare Fuse See Fuse Protection 1 XLR Input Shorting Plugs 2 Torx Wrench T 10 1 Spare Top Cover Screws 5 User s Manual 1 Save all the packaging material in a safe dry area for the unlikely event that you need to return the VK P12SE to the factory for service Reseating Tubes Normally reseating tubes upon delivery is not required However if any tubes have noticeably drifted out of position due to unusually high transportation stress it will be advisable to reseat the tubes Use the supplied Torx wrench to remove the top cover Reseat the tubes in their sockets and reinstall the top cover NOTE When using the Torx wrench make sure it is fully inserted so that the screw head is not stripped Physical Placement It is recommended that you provide for at least 6 of free space around the unit for proper ventilation Mount the unit on a hard surface with proper ventilation underneath Do not stack the VK P12SE phono stage on top of other units nor vice versa General Description of VK P12SE Phono Preamplifier The VK P12SE balanced all tube phono stage is designed to provide the ma
10. ximum possible performance while operating in conjunction with the wide verity of phono cartridges available today The unit offers unmatched versatility in system configuration by providing the following features Wide range of user selectable gains from 44dB to 79dB See Specifications section for choices Built in high quality step up transformers that can be used with very low output phono cartridges Selectable cartridge loading for both resistance and capacitance Absolute polarity reversal switch Please refer to the Configuration Switches section of this manual for information on how to configure the VK P12SE phono stage for optimal performance in your system Connecting the VK P12SE to Your System Cartridge Input The back panel of the VK P12SE phono stage is equipped with two sets of input connectors RCA input connectors XLR input connectors Either set can be used for connection This gives the user the flexibility in connecting the phono cartridge cable to the VK P12SE Whenever possible the balanced XLR inputs should be used They provide the best possible performance Please contact the factory regarding the best ways of connecting your tonarm to the VK P12SE NOTE Connecting to RCA Inputs When connecting your cartridge to the VK P12SE RCA inputs it is necessary to install the supplied shorting plugs into the unused XLR inputs Output Connection The VK P12SE is equipped with XLR output connectors An
11. y high quality set of balanced interconnects can be used to connect the VK P12SE to your balanced preamplifier Single ended preamplifiers can be connected to the VK P12SE output through the use of XLR to RCA adapters available from BAT Description of Controls Power Switch The power switch toggles between two positions OFF and ON Putting the unit in the OFF position even for a short period of time will reset the soft start and mute circuits The VK P12SE will then require about 45 seconds to return back to normal operation When you turn the unit ON the VK P12SE will automatically go through a gentle power on sequence At the end of this sequence the unit will automatically unmute However since the source volume may be unknown at this time it is advisable to turn the volume control on your preamplifier fully counterclockwise and place the mute switch in the Mute position before turning the VK P12SE ON Phase Switch The Phase switch on the front panel of the VK P12SE allows the user to compensate for recordings made in inverted polarity It toggles between two positions 0 and 180 The LED will light when the unit is put in its 180 state With this switch in its 0 position the VK P12SE performs as a non inverting preamplifier Switching into the 180 position will invert the absolute phase of the signal It is important to note however that in both 0 and 180 positions of the Polarity switch the signal pass
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