Hello,
I have an project that i work on for several years (in my spare time). Its an servobias to mentain bias for valve amplifier (output tubes).
Specification:
Price for 4 tube version is 98Euro and for 2 tube version is 82Euro excluding sipping cost (~ 12Euro with tracking number).
For more info LINK
I have an project that i work on for several years (in my spare time). Its an servobias to mentain bias for valve amplifier (output tubes).
Specification:
- work with SE, PSE and PP class A with 4/2 tubes
- size 100mm X 49mm X 15mm (W*L*H) for 1-4 tubes and 81mm X 49mm for 1-2 tubes
- hole size 3mm
- power input 6.3Vac - 12.6Vac
- consumption ~ 28mA
- grid voltage -20V ... -120V (module can handle up to -200V)
- can control an external relay for HV delay (delay can be adjusted, min 5s to 1000s in one second step) to connect/disconnect HT
- small OLED display to show information and setup the module (can work without after inintial setup)
- rotary encoder with push button (can work without after initial setup)
- max voltage read from tubes cathod (K1...K4 inputs) 1V
- can detect valve current runaway, in this case all valve will be maxim negativated and HT relay is decoupled
- with double click on rotary encoder servobias go in "half mode" PDA (to preserve valve life)
Price for 4 tube version is 98Euro and for 2 tube version is 82Euro excluding sipping cost (~ 12Euro with tracking number).
For more info LINK
Attachments
Thats interesting. Where are you shipping from?
Did you compare your module with your competitions? Like audioamp.eu
Did you compare your module with your competitions? Like audioamp.eu
Hello, i ship from Romania. I did compared, and i decide to make more versatile version of servobias, to allow user use many tipe of tubes (if Ra/Raa match).
The whole ideea is to wire the module, set de desired current and forget about any maintenance. This way even if tube are not perfect matched, the Servobias set them where sould be.
Best regards!
The whole ideea is to wire the module, set de desired current and forget about any maintenance. This way even if tube are not perfect matched, the Servobias set them where sould be.
Best regards!
Only 5 pieces of each type remain from last batch.
Due the semiconductor shortage, next batch will be little more expensive.
Due the semiconductor shortage, next batch will be little more expensive.