WJA Electron Audio

WJA Electron Audio

Power-amp design

6C45PI input & 2A3-40 output valves providing 2 stage SET
No electrolytics in the main circuit or HT power supply (just in DC supply for input heaters)
Constant current source fed VR tubes for input stage
Constant Current Source anode load 6C45PI input stage
Constant current supply for 6C45PI filaments.
D3a input as option. (higher gain)

Performance

About 6 to 7 Watts a channel.
Design modelling using LTSpice running on Ubuntu & WINE

UPDATE: Replaced AC heaters on 2A3-40s with the famous Rod Coleman heater supply.  Money well spent!  No hum at all.  Only 700µV (yes microvolts) of ripple on my loudspeaker terminals.

Power-amp design

6C45PI input & 2A3-40 output valves providing 2 stage SET
No electrolytics in the main circuit or HT power supply (just in DC supply for input heaters)
Constant current source fed VR tubes for input stage
Constant Current Source anode load 6C45PI input stage
Constant current supply for 6C45PI filaments.
D3a input as option. (higher gain)

Performance

About 6 to 7 Watts a channel.
Design modelling using LTSpice running on Ubuntu & WINE

UPDATE: Replaced AC heaters on 2A3-40s with the famous Rod Coleman heater supply.  Money well spent!  No hum at all.  Only 700µV (yes microvolts) of ripple on my loudspeaker terminals.

Important links

Contact

WJA Electron S.A.R.L.
216 Route du Mas de Soulié
46230 Cremps, France
International VAT Number: FR08503863136

© 2024 Created with InfinITiServe 

Contact

WJA Electron S.A.R.L.
216 Route du Mas de Soulié
46230 Cremps, France
International VAT Number: FR08503863136

© 2024 Created with InfinITiServe 

Solverwp- WordPress Theme and Plugin

Scroll to Top