Options
1. Plan1: No RCA&XLR terminals included,Sold as DIY kit
2. Plan2: Included all RCA&XLR terminals, Sold as DIY kit
3. Plan3: Included all RCA&XLR terminals and 600:600 coupling transformer, Sold as DIY kit
Specifications
Input and Output:
Balanced input - balanced output,
Balanced input - single-ended output.
Single-ended input - single-ended output,
Single-ended input - balance output.
Weight: about 1.5Kg
PCB size:
Main board:230*260mm (2mm thick)
Signal Input board: 230*70mm (2mm thick)
Power requirement:
AC/6.5V/2A (±3%) _ AC/280V-0-280V/100MA (±5%) _ AC/14V/3A (±10%)
Required tubes:
6X4/EZ90 ×1
ECC88/6DJ8/E88CC/6922/6N11 ×2
12AU7/ECC82 ×2
Warm reminder of purchase
Pls plug tube into socket before soldering tube socket to PCB board, That can avoid glass of tube is damaged while plugging in after assembly.
Resistors must be suspended soldered to keep space between resistor and PCB board, Because some resistor would be hot while working,Suspended installation can dissipate the heating quickly and make the amplifier works reliable
This Product Designed For The senior audiophile Who can understand the circuit ,The Assembled Board will be Tested Well Before Sending ,As the knowlege of uses is different ,The incorrect assembly or damage is out of ours product warranty ,We only provide technical service ,Your purchase means you agree this statement
Because purchased components may different when purchasing from supplier, Thus part of the components may have difference with pictures, But the quality and performance would be the same.
This board need you have electronic technology and detectability,it&39;s for senior audiohile whom capable of assembling tube products only.
Assembled preamp board for reference only
Bent the leads of diodes in proper distance
Solder resistors and diodes
Compatible transistors and pin out definition
Default transistor is K179, It is for 12AU7 quiescent working point and amplification adjustment, 14DB is about 5 times,17DB is about 7 times, 20DB is about 10 times
Pls plug tube into socket before soldering tube socket to PCB board, That can avoid glass of tube is damaged while plugging in after assembly.
The transistor can be paralled if working current it too low
Soldering volume potentiometer with FPC flexiable printed circuit to amplifier board
Install volume potentiometer on PCB with a L angle
Install RCA and XLR terminals on signal input PCB
600:600 input coupling transformer for PLAN 3,With the coupling transformer the input&output can be converted between balanced and unblanced
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