I´ve split it and soldered wires so i can run it disassembled.
Didn´t have a neon so stuck in a zener instead.
Checked the tubes one 6j5 dead one bad.
Didn´t check them since they were NIB NOS Brimar just stuck them in.
Time for a new trip to storage and some non "drive by engineering" check recheck doublecheck then fireup.
Didn´t have a neon so stuck in a zener instead.
Checked the tubes one 6j5 dead one bad.
Didn´t check them since they were NIB NOS Brimar just stuck them in.
Time for a new trip to storage and some non "drive by engineering" check recheck doublecheck then fireup.
A standard diode would be better 1N4007 has been used in the past..
1n4148..etc
Regards
M. Gregg
Express trip to storage.
Soon to be tested !
I guess these have a series resistor 110v...no resistor required just straight from grid to cathode.
They will come on for about 5-10 seconds then as the tubes warm up they go off...
Regards
M. Gregg
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Just for reflection,
I have found that I tend to run the amp many hours at a time..
I don't even think about the tube offset or the bias... (never enters my thoughts)
I never even think of it as OTL...
Just switch on and play..I find I tend to head straight to the amp and power on as soon as I come home.
It’s on mainly on one heater for 4-6 hrs a day..Most days..
Strange....most amps I have bought or built tend to get switched off after a time..not this one..when I go to turn it off I don't want to..normally under pressure for someone to go and do something..YMMV
Regards
M. Gregg
I have found that I tend to run the amp many hours at a time..
I don't even think about the tube offset or the bias... (never enters my thoughts)
I never even think of it as OTL...
Just switch on and play..I find I tend to head straight to the amp and power on as soon as I come home.
It’s on mainly on one heater for 4-6 hrs a day..Most days..
Strange....most amps I have bought or built tend to get switched off after a time..not this one..when I go to turn it off I don't want to..normally under pressure for someone to go and do something..YMMV
Regards
M. Gregg
Volume halfway up the chitter chatter starts .
A quick check on the HP 3582A/339A wasn´t to breathtaking either.
I didn´t come close to your readings before THD skyrocketed.
My tubes probably needs a burnin period before measuring again so i´ll leave it on repeat and forget about the electric bill for a while.
A quick check on the HP 3582A/339A wasn´t to breathtaking either.
I didn´t come close to your readings before THD skyrocketed.
My tubes probably needs a burnin period before measuring again so i´ll leave it on repeat and forget about the electric bill for a while.
Resistor failure probably to low voltage rating.
It´s starting to come alive, sounds better for every minute.
Can´t turn it all the way up starts distorting badly at 75%.
I´ll let run at 50% for a burnin period before starting to measure which stage is doing what.
Have start figuring out a way to trick it into playing a little louder .
It´s starting to come alive, sounds better for every minute.
Can´t turn it all the way up starts distorting badly at 75%.
I´ll let run at 50% for a burnin period before starting to measure which stage is doing what.
Have start figuring out a way to trick it into playing a little louder .
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