Electrically, yes. The Soviet 6N9S is a "copy" or "upgrade" to the 6SL7 depending on who you ask.
Both will work well. 6SL7 will be less microphonic most of the time. Unless your amp is on an amusement ride (from the vibration) (Gravitron Ride (On-Ride) - YouTube), that probably doesn't matter.
Both will work well. 6SL7 will be less microphonic most of the time. Unless your amp is on an amusement ride (from the vibration) (Gravitron Ride (On-Ride) - YouTube), that probably doesn't matter.
Last edited:
The worry I'd have about that PCB is that the 6P14P/EL84 tubes are placed so close to each other.
I had a Dyna ST35 with EL84s on PCBs. Over time and use, the PCBs literally cooked, got brittle, traces came off, and the amp died. I still have the iron, but the amp chassis is long gone...
I had a Dyna ST35 with EL84s on PCBs. Over time and use, the PCBs literally cooked, got brittle, traces came off, and the amp died. I still have the iron, but the amp chassis is long gone...
Modern boards deal with the heat a lot better than the older ones. I wouldn't worry about the spacing unless you built it inside a sealed box.
Too bad the chassis is gone. You could have rebuilt it “better than new” using Dave Gillespie’s boards and modified bias system.
http://www.tronola.com/A_New_Look_At_An_Old_Friend.pdf