Hi guys if I reverse engineer this phono stage do you think I will be able to determine the tube types used?
thanks.
thanks.
Well the octal socket must be a 5??4 rectifier of one type or another, at the other end of the scale from GZ34 on current rating, and by the heater wiring the novals look to be twin triodes of the 12A?7 variety, probably 12AX7 judging by the gain required of a phono stage. Some resistor values around the sockets would help..
You should be able to have a good idea which of several tubes could be used, but perhaps not
the exact original one (s) for certain. Did you get this unit without any tubes?
the exact original one (s) for certain. Did you get this unit without any tubes?
Thanks. Looking forward to getting it up and running to compare to my Charles King phono stage 🙂
What do you know about this phono stage chassis? Was it a published design, or just one of a kind?
How did you get it with no tubes, and has it ever been powered up and working?
How did you get it with no tubes, and has it ever been powered up and working?
I think it was a one off that was a clone of a 10y or a off shoot of a 10y that did work at some point. However that’s all I know 🙂
Ok, then remember to use a Variac to bring up the voltage for the first time to reduce
the chance of electrolytic capacitor failure.
the chance of electrolytic capacitor failure.
Thanks. I will also get a circuit drawing with the help of a friend to get a better idea of what is going on.
Will do!! Once I have a drawing I will post it up. Someone sent a msg indicating DHT are most likely 01a tube family.