The Amp Garage

So I tried to tackle the noise issue with help from ChatGpt? Chat GPT had me put a 47pF cap between the sleeve and ring lugs for the input jacks. I tried it in 2 and had no effect. When I plug a guitar cable into one of the jacks the radio station plays on either channel including the one channel th...

I just bought a vintage Vox AC10 on impulse.(paid way too much :( The amp cosmetically looks clean as a whistle. Inside some of the electrolytics have been replaced everything else is original including the speakers. Almost looks like it has never been used. the amp is a little noisy and I am pickin...

It has been around 10 years since I built my #124 Since that time I have gotten away from amp building and have forgotten a lot. I fired up the 124 and noticed the Jazz/Rock switch is up/down. I was reading the notes on the amp and this is described as having a middle position, I am wondering If I i...

Thanks! Are there any schematics available?

Just got a mint filmosound projector any recommendations of how to convert
to guitar amp. I heard a guy playing one at a grammies party and it blew my mind.

I have some solid core ptfe 20awg I got from apex JR I have no doubt it can easily handle the 12o V from the IEC jack running to the switches and fuse my concern is the shielding on that wire is so thin won't that necessarily lead to increase interference created by the AC current passing through th...

thanks
i have bought from apex jr before excellent stuff
should i twist the pair? building an 18 watt marshall

Hi
what wire do you guys recommend to wire
from the IEC internally to the fuses and switches in
an amp? Since it is carrying AC should it have thicker insulation?
18 vs 20 gauge? Recommended supplier?

Thanks

so i scored a 50watt combo 1979 hiwatt with partrige transformers has a real warm sound with marshellesque type breakup. So i took it apart today and everything is original including old mullard pre amp tube probably original. The EL34 not original are GE. so I tested the tubes and one tested "low g...

Hi looking for recommendations for best sounding current production
12ax7 and el84's?

Thanks

Hi I just bought a 1979 50 watt custom combo hiwatt it has partrige transformers and seems all original. I paid $1250 doe any have any mods for this amp such as how to jump the two channels? It came with an old EV12L is this a good speaker match? I was thinking about replacing it with a celestian al...

I biased the amp to -35v as per the suggestion on this video
Is that the correct value?
http://www.youtube.com/watch?v=p3dEY9FcSuo
Thanks

that will be my next job have to order some more caps.
just curious what happens if you use cap rated at higher voltage thn need but the correct capacitance value. Don't plan to do this but have always been curious about this

Wow, so I changed the power supply caps and bias cap,
I am not sure if its my imagination but my amp sounds at least twice
as loud Everything feels tighter. Cant believe I waited so long to do this.
What a no brainer!!

Do the earlier versions before AB763 sound different ? would this still be considered the typical blackface circuit I know around the time this amp was made was when CBS took over and they were heading towards silverface era?

Thanks!! I am always amazed how much information you guys know!!