Does anyone have a schematic for the AQ-1006 single ended 845 amplifier that used a doubler for the B+ and AC for the 845 filaments?
Thank you but the amps I'm working on don't have bridge rectifiers and the filament on the 845 is AC heated.
The high voltage is a voltage doubler and the voltage for the regulated front end supply is tapped off of that.
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Do you find power transformer part # here? The original website is not accessible or updated, these infoes could be the last archives I think.
I do find a 845 but not AQ1006 with AC heater supply here, just do without DC rectifier.
Do you find power transformer part # here? The original website is not accessible or updated, these infoes could be the last archives I think.
I do find a 845 but not AQ1006 with AC heater supply here, just do without DC rectifier.
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I think these are early amps and there was a lot of changes on the later ones. The ones I'm working on use a voltage doubler for the high voltage and all the filament/heater supplies are AC. I have everything working now. It just would have been nice to have the proper schematic but I have it figured out. Thanks again.
Feel free to drop your reverse engineered schematic here, could be useful for someone in your position years from now
all the ASL 1006 that i repaired, about 5 of them had dc filament heating, an mda3500 and huge cap....
strange, but these versions had the cathode followers made into cascaded cathode followers just so they can add a coupling cap, crazy thing.....so what i did was to restore it to original schematic..
strange, but these versions had the cathode followers made into cascaded cathode followers just so they can add a coupling cap, crazy thing.....so what i did was to restore it to original schematic..
The audio circuit seems to be the same as the schematic in post #2.
The 845 B+ is a doubler and the raw B+ for the regulator is tapped off of the doubler and the bias voltage is half wave. All the heaters/filament are AC.
I think that says it all.
the circuit itself leaves so much to be desired....the psu filter caps are prone to burst or bulge....
I would use 3*4700uF 450V in series and go (R) C L C C
First R to get rid of EMI so 15 ohm for that. Then 1600uF 5H 2*1600uF
First R to get rid of EMI so 15 ohm for that. Then 1600uF 5H 2*1600uF
that is how it should be done....btw, i also encountered a choke that had an adjascent turn shorts....in that amp....