Gr8Scott
Wookieologist
Re: '68 Blackface Bassman 50w?
Has the amp had a cap job within the last 20 years? If not, the old caps could be the cause. My AA864 circuit conversion did that when I left one of the original cap values in the pan that didn't need to be there from the silverface design. Component drift is also another reason that this sort of thing happens.
Find an amp tech and describe the problem to him. Ask him if he thinks it will require a transformer change. I'll bet he will say no. If he says no, ask him how much it is likely to cost to have that problem fixed. Deduct that amount from the amount that the guy is asking and strike that deal with him. The cool thing about doing this is that you can have that same amp tech do a subtle mod or two while he is in there for a few bucks that will boost the mids on one channel etc (essentially adding a larger resistor between the bass knob and ground on whichever channel has the most gain by itself). If this is an AB165 circuit amp (and it likely is), that will give you a little broader tonal palette.
These are great amps and you may still yet have a phenomenal amp if you give it a try. Best of luck to ya sir.
Has the amp had a cap job within the last 20 years? If not, the old caps could be the cause. My AA864 circuit conversion did that when I left one of the original cap values in the pan that didn't need to be there from the silverface design. Component drift is also another reason that this sort of thing happens.
Find an amp tech and describe the problem to him. Ask him if he thinks it will require a transformer change. I'll bet he will say no. If he says no, ask him how much it is likely to cost to have that problem fixed. Deduct that amount from the amount that the guy is asking and strike that deal with him. The cool thing about doing this is that you can have that same amp tech do a subtle mod or two while he is in there for a few bucks that will boost the mids on one channel etc (essentially adding a larger resistor between the bass knob and ground on whichever channel has the most gain by itself). If this is an AB165 circuit amp (and it likely is), that will give you a little broader tonal palette.
These are great amps and you may still yet have a phenomenal amp if you give it a try. Best of luck to ya sir.
