After I published the first part in 2 months ago about planning to make 95A amplifier.
Now I finish these mono-block amplifiers with some modifications from original schematic.
1) Using main power transformer instead of connect directly to power outlet
2) Using 80 full-wave rectifier tube instead of parallel 25Z5 tubes
3) Replace 221B with 221G choke (higher inductance)
4) Add WE313CC as voltage regulator & bleeding tube
5) Add LC filter to each screen grid for make lower noise voltage
6) Change some resistor & capacitor values based on real characteristic tube's curve
Expand some holes to put Neutrik connector both AC inlet (powerCON) and XLR input.
Almost US made components except transformers & choke from P&C Japan.
All 43 tubes are Raytheon 4 pillar (engraved base), 80 tube from Visseaux (France).
Top view
Close-up
Techlab PK-322 600 ohm attenuator
Raytheon 4 pillar
Visseaux 80 tube
Bottom view
Speaker terminals
Ready to use
Neutrik powerCON AC Inlet
Neutrik XLR input connector
Original Schematic of WE95A amplifier
Schematic of modified WE95A amplifier
It's sound very good especially instrumental. Transparency & good tonal balance.
Maybe need more burn-in time to get it's real sound.
Finally I finish this project and post to this blog within 2022.
Happy new year to everybody!
Cheers!!!