Universal PCB for ECC88, E88CC, 6922, 6N2P, 6N6P and ECC81, ECC82 and ECC83

PCB features: Possibility installation:

• additional filter capacitor for anodes
• capacitor blocking cathode resistor
• protective diode in CCDA circuit
• rebalancing resistors

Different compare ECC88 and ECC81,82,83: Heater PSU For ECC88 leg 9 is connected to the shield that separates triode in the tube - it can be shorted to ground. For ECC81-83 leg 9 pin connected the center of the filament, so you can power the 12.6V (between legs 4-5) or 6.3V voltage (between 4-5 legs shorted and 9 leg).

SRPP - Shunt Regulate Push-Pull

CCDA- Circuit - constant-current-draw amplifier

Theory for CCDA:

• https://www.tubecad.com/2009/03/blog0161.htm

Offer applies: 1 x bare PCB + circuit diagram