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Old 17th December 2015, 12:24 PM   #1
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Location: Bulgaria
Default Another variants of using PCB from Ebay

6J1 Valve Pre Amp Dual Channel Tube Preamp Preamplifier Board PCB | eBay
1. You can use this preamp for 5 $ /in triod mode now/ for 6S41S, GU50, 6AS7, 6S19P......if put it in penthode mode with current about 10 ma.
2. You can use it like phase splitter, if connect 2 resistors about 50-80 kohm in plate and in cathode /cathode cap disconnect/ and add caps about 0.22 - 0.33 in plate and cathode.

ECC88 Stereo Tube Preamplifier with Power Supply PCB DIY | eBay
PCB for 8 $. Like phase splitter with separate PS.

Vacuum Tube SRPP Headphone Amplifier Pre-amplifier AMP Board PCB for 6N11/6DJ8
1. You can use it / for 6 $/ like regular preamp. Instead output cap put cap 0.22-0,33 uF and disconnect 470 kohm from output.
2. You can use this PCB like phase inverter /upper triod/ and prestage /downer triod/ Disconnect downer plate from 75 ohm and connect res about 30 kohm to +U /You can use some variants of +U/. Instead 75 ohm You can connect about 30 kohm to cathode and to ground. Add 30 kohm in upper plate. Disconnect upper grid from downer plate and add interstage cap about 0.22-0.33 uF /You can try and mode Loftin White between prestage and phaseinverter. Maybe You can use more decisions for this variant.

The same with this for 8.90$: Tube 6N3 Buffer Audio Preamplifier Pre Amp Amp DIY PCB Bare Board | eBay

If You have more ideas, You can inform us, please.
I'm afraid vendors will increase the prices....

Add this for 2.5 $ in Your tube amp for bass speaker: http://www.ebay.com/itm/DC-3-to-18V-...3D141295480233
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Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....

Last edited by azazello; 17th December 2015 at 12:38 PM.
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