The Amp Garage

If you are trying to give an old amp some extra life, then clean them. If considering a new build, forget it, buy new ones instead. There's no sonic signature or improvement in using old surface corroded parts and yes future problems. Not too different from using NOS electrolytics,and for the same r...

Just got a couple of old Dynaco FM tuners one mono, one stereo both picked over for parts. No real useful tubes. Not such a thing :wink: I mean, probably you can't pop them straight into your Fender or Marshall, but the World does not end at 12AX7 ;) *Any* tube (excluding rectifiers, that is) can b...

What katopan said.

Same here.

Or you'll be stuck with a full redesign-reconstruction-rebuilding-plain building nightmare.

You don't have a formerly good, now broken amp which by definition only needs repair, but full re engineering.

Who will pay for that?

And even so, success is not guaranteed.

Sorry.

Since you will cut and punch your new front panel, design it so you reuse as many pot holes as possible , the few unused remaining behind the thin front panel which might even be thin plastic, wont weaken the chassis appreciably, at the same time a couple new pot holes amd maybe a couple tiny toggle...

Hey, nice build

True. Notice speaker surface doubling vs. the guitar amp, nominally almost double power and use of big fat efficient speakers. Not mentioned because it's a given: that bass 4x12" must be fat/bulky too, not just a plain 1960 type. The Ampeg 4 x 12" V4 is such an example of a killer 4x12" for bass (al...

I guess uf has to be divided by one million to convert to Farads.

Actually it's the other way round

With due respect, your friend has no clue. He just heard "tubes are GOOD" and follows that line. Which is true, but problem is: it's *easy* to get 50 tube watts: you use 2 bottles, pick your flavour. 100Watts? ... almost as easy, just use larger iron and 4 bottles. 200W? ... you just use huge iron a...

Well, that's the most versatile solution. The point is that using a poor supply, specially very small caps , and a small transformer which means thin, high resistance wire plus a very lossy rectifier tube which only adds to the equation, means that +B sags *a lot* , which means you are adding a very...

I think the voltage/wattage conversion of respectively 9 and 12 volts are a bit too high. ........................ into a fixed 8 ohm (dummy) resistor. However, a real "8" ohm speaker usually has a lower ohm reading . If you put 9 V ac into a Greenback (http://celestion.com/product/24/heritage_seri...

Even a single sheet of aluminum at the bottom works wonders, apparent gaping holes at ends won't really hurt unless interference is not exactly aligned to profit from in-out holes. RF shielding is different, specially if a high power generator is lurking inside, because RF wavelengths are tiny, and ...

[quote="roberto"] Dear all, I've just receipt a broken Marshall 8008 paid 25 euros and I would like to tweak it to find how can I like it, Not much to tweak, sorry. - C2 R2 and R1 make a highpass at 18 Hz; yes - C1 and R1 make a lowpass at 10260 Hz; no, the lowpass is C2 + R2 + whatever VR1 is set t...

Thinking laterally: If you are so tight with your budget, why not just build a *two* EL84/6V6 amp? Ample power for most uses, you use what you have at a sedate pace, (amp will last forever) and anyway most people find their current amps too loud and start endless threads on how to tame them ... you'...

That said, if you dare, you can open those overjuiced wall warts and Technically, this is correct. From a personal longevity viewpoint, it's a disaster. The problem is the word "open". Wall warts are a safety cage that keeps the AC mains demons safely bottled up inside. Cracking them open usually e...