HellfireStudios
Well-known member
I'm looking to incorporate a 6922/E88CC/6DJ8 tube in my Nady TCM1050 w/ U47-ish mods (actually the circuits pretty close except for the larger x-former coupling cap). After the compelling argument for the tube from FAR, I was wondering two things:
1) Has there been any attempts/successes with this tube?
2) How to implement the changes to the circuit (I've done some research, but have come up with very vague info)?
This may help the more knowledgable..
Quoted from Fox Audio Research's website:
"The first thing to say is that the pin out is just different enough that it doesn't work with 6072 wiring but it's only two minor changes."
and
"Techie Note:
The tube socket is wired so that both triodes are working in parallel. This reduces random "shot" noise another 3 dB. With the 1.15 V fixed bias, the combined plate current went from 555 uA with the 6072 to 840 uA so the 6922 is conducting harder as expected with the lower plate resistance. This changes the operating point of the amplifier slightly but voltage at the plate is now 34V which coincidentally is that same as a u47."
Any help in understanding and implementing this technical stuff would be much appreciated.
-James-
1) Has there been any attempts/successes with this tube?
2) How to implement the changes to the circuit (I've done some research, but have come up with very vague info)?
This may help the more knowledgable..
Quoted from Fox Audio Research's website:
"The first thing to say is that the pin out is just different enough that it doesn't work with 6072 wiring but it's only two minor changes."
and
"Techie Note:
The tube socket is wired so that both triodes are working in parallel. This reduces random "shot" noise another 3 dB. With the 1.15 V fixed bias, the combined plate current went from 555 uA with the 6072 to 840 uA so the 6922 is conducting harder as expected with the lower plate resistance. This changes the operating point of the amplifier slightly but voltage at the plate is now 34V which coincidentally is that same as a u47."
Any help in understanding and implementing this technical stuff would be much appreciated.
-James-