The Amp Garage

Hiya.... just to be clear, the Corona Dope #10-4702 dries flexible & what is typically used for the surround on paper cones, correct? And if this isn't the correct stuff, what is?
Thnx, Kenny ॐ

I'd also cut C8 down progressively. Reduce C9 and C10 to 22nF. But for what you want I'd redesign it to a single channel to add your gain stages. Thanks TUBEDUDE!! I'd love to have a great single channel setup instead of 2 just 'okay' channels. Do you imply that have my tech perform some sort of ca...

Good evenin' all~ I obtained this early 60's Hilgen BASS amp. Historically, Hilgen was a NJ company that was tied in with Sano, Giulietti, then what would ultimately be rebranded to Univox. Not that Univox had a model quite like this, but several other Hilgens did; 7591, GZ34, & a host of pre's. Thi...

Greetings.... What's a good choice for my Mesa Boogie DC-3 tube cooker? It's not necessarily a heavily used amp, so sound quality may be a tad more important than longevity. I'm looking at either a quad of RI Tung-Sol EL84's or some of the Soviet 6P14P-EV's. Any thoughts on these 2 choices, or any o...

I just picked up an old 60's Hilgen guitar amp, my 3rd one this month, and only one of the tone pot's taper is backwards
Do I simply reverse the connections to the outer lugs, leave the middle, and I'm in business?
YES, it's been a lonnng day~
Thnx, Kenny ॐ

Greetings,,, from this here schematic, can one tell where the NFB is, or if it even has one??

Well folks, all in all, faster than it takes to change all 6 strings on a gtr., it's done!!
I live it when everything simply falls into place..... thanks again!!
and it sounds AWESOME ÷÷

And THAT Green wire doesn't go directly to the speaker lead,,, it goes into the tranny first.... I'm good there?
thnx a mill~ॐ

Thnx Max,,, so take this green wire, & insert my double throw on/off switch there,, Green wire to one pole, & a wire from that (former) connection to the other pole.... then I can chassis mount somewhere on the back? Again, that Green wire goes into te tranny,, No issue, right? the only destination ...

The end of the resistor is connected to that Green wire which goes into the tranny, with ANOTHER Green wire emerging from the tranny & going to the speaker....
So, lifting that R38 as it sits (the tan side of board) on either end, won't remove the NFB?

OK,,, here's what I'm staring at, R38/68k NFB.... Being an above average solderer & welder, I'm still skittish around traces that one can easily be ruined ..... Given what I have here, depending on the clipped results, I'll probably want to insert a simple on/off switch.... If I quickly hit that low...

Thanks MARTIN & everyone else!!

My on/off toggle has 2 connects,,, the end of the resistor will go to one, & a lead will go from the other 'connect' and complete the circuit at the point I clipped it? thnx

Thanks again, so just to put a lid on this baby, if I simply wanted to hear just how it sounds w/o the NFB, I could "interrupt" the wire from the spkr jack to the nfb R? And if I liked it as is, w/o any NFB, I could let it hang as is, perhaps just taping it off? thnx

Yèr all rockstars!! Thanks!! FWIW, this is all about my new old Ampeg AC12, which proceded their model GU-12, (favoured by Keith Richards during Exile & other players) 'round 1969 thru 1971. From everything I've been able to dig up, the only difference between the 2, is that they yanked the NFB on t...