Hello all,
I have recently acquired a heathkit aa-23 25 watt "hifi" amp. It sounds ok... but it is LOUD, way too loud.
I know it needs a single 1 meg pot. for the volume control (dirty). Its a mono block and listening in mono kind of sucks.
The tubes in order from input to output
6eu7 Westinghouse premium
6eu7 Daystrom
12au7 Daystrom
7591 Philips times 2.
rectifier tube is 5AR4 Westinghouse
To me there is way to much gain. As a Bass guitar amp it sounds nice with a EH 12at7 instead of the 12au7 (though still very loud). With it as a Bass guitar it sometimes "pops". I was thinking about splitting it in two and having a single 6eu7 feeding a 7591 in class A. Unfortunately the B+ voltage is quite high ~470 VDC and class A operation for 7591 is 300 VDC.
Sell, keep as Bass amp, or with less gain might sound better. Was originally used as PA amp for a Church.
James
I have recently acquired a heathkit aa-23 25 watt "hifi" amp. It sounds ok... but it is LOUD, way too loud.
I know it needs a single 1 meg pot. for the volume control (dirty). Its a mono block and listening in mono kind of sucks.
The tubes in order from input to output
6eu7 Westinghouse premium
6eu7 Daystrom
12au7 Daystrom
7591 Philips times 2.
rectifier tube is 5AR4 Westinghouse
To me there is way to much gain. As a Bass guitar amp it sounds nice with a EH 12at7 instead of the 12au7 (though still very loud). With it as a Bass guitar it sometimes "pops". I was thinking about splitting it in two and having a single 6eu7 feeding a 7591 in class A. Unfortunately the B+ voltage is quite high ~470 VDC and class A operation for 7591 is 300 VDC.
Sell, keep as Bass amp, or with less gain might sound better. Was originally used as PA amp for a Church.
James