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In Reply to: RE: guitar amps???? posted by vinnie2 on April 17, 2016 at 04:06:50
You have a signal generator and scope?
I find the guitar the best to test amp, at all volumes. One with single pole pickups, like a nice Telecaster or Strat. And one with humbucker pickups, like a Gibson Les Paul or 335.
Do you have photos of the transformers and speaker? Esp the manufacturer's stamped codes. These will help a lot, for dating the amp, seeing how OEM it is, and any upgrades or restorations needed.
Does the amp have single electrolytic caps or multi-cap can(s) in the main PSU?
Follow Ups:
A guitar is not an option I am afraid. What is the next best bet? I do have a 'scope.
I will post some pictures in a day or two.
Edits: 04/17/16
Do you have access to a microphone or electric organ or piano?A signal generator would be nice. At least, to check to see if the amp & speaker can make a nice sine wave tone. But, the SG won't help you check for complex overtones, overdrive, harmonics, saturation and all those other things that make a tube guitar amp sound so good.
Edits: 04/17/16
I think I will use my signal generator for the initial testing. Can I run music from my tube preamp to check out how it sounds?
Sure worth a try. Need to rig a 1/4-inch mono jack to the signal source. Never tried that setup, may sound a bit odd with the compressed nature of the music source & the EL84 guitar amp. And that narrow range onboard speaker.Maybe a nice acoustic guitar CD?
Edits: 04/17/16
"Acoustic guitar CD". Now that I have. Worth a try.
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