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6G4A super amp, 125P5B


 :
4/26/1999 10:33 AM
sosRicardo 6G4A super amp, 125P5B
I can't find any reference to this 125P5b power transformer. Can anybody out there help me?
 
4/26/1999 11:40 AM
J Fletcher
I have a 6G4A Super with an 8087 power transformer, same as the 50's version. Same as the 4X10 Bassman too. The 125P5B sounds like a Fender #,maybe a bit later than mine. I see on the 6G6 Bassman they use a 125P5A, and it has a 5 volt winding.Are you looking for a replacement?...Jerry
 
4/26/1999 6:46 PM
RICARDO
Jerry, I wish i had the 8087. What I need to know is whether or not I can substitute a rectifier tube with directly heated cathode. I like the GZ34, but wish to fool around. I am about to replace the filters. Stock filters are 25mfd-525wvdc. Does your amp have 20mfd-600v filter caps shown in the schematic?
 
4/28/1999 12:09 PM
J Fletcher
Don't remember for sure, but I think mine are 20u@ 600v. Is your concern that you might draw too much current for the 5 volt winding to safely handle? I can't advise whether it's a good idea or not to draw 3amps from this winding, but I suspect it's safe. I like mine the way it is,with a GZ34....Jerry
 
5/3/1999 12:29 PM
Ricardo
Jerry, thanks for the continued interest. The amp is not operating at present, but I suspect the power transformer is OK. It's just different . Once it's running I'll get back to you with the operating voltages, which I suspect are much lower than yours. I'm assuming These lower voltages because of the different filter caps[20-525]. The amp also has a different fixed bias voltage supply and I suspect it will sound nothing like the 6G4 amps I heard before deciding to purchase one.
 
5/3/1999 12:29 PM
Ricardo
Jerry, thanks for the continued interest. The amp is not operating at present, but I suspect the power transformer is OK. It's just different . Once it's running I'll get back to you with the operating voltages, which I suspect are much lower than yours. I'm assuming These lower voltages because of the different filter caps[20-525]. The amp also has a different fixed bias voltage supply and I suspect it will sound nothing like the 6G4 amps I heard before deciding to purchase one.
 
5/3/1999 12:29 PM
Ricardo
Jerry, thanks for the continued interest. The amp is not operating at present, but I suspect the power transformer is OK. It's just different . Once it's running I'll get back to you with the operating voltages, which I suspect are much lower than yours. I'm assuming These lower voltages because of the different filter caps[20-525]. The amp also has a different fixed bias voltage supply and I suspect it will sound nothing like the 6G4 amps I heard before deciding to purchase one.
 

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