#1
I recently was given a Epiphone Electar Tube 30 tube amp that does not work.

It has two small tubes and two larger tubes. is there a way to test them with a multimeter?

I also have a 2X12 Crate amp. would tubes be interchangable?

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#2
i wouldnt try it. turn it on and see if they glow. the big tubes are preamp, the little ones are power.

also, no, in most cases tubes are not interchangable, and theres a special process you need to go thru to swap out tubes.
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#3
It appears you don't have a lot of experience with tubes. They can't just be swapped in an out between amps. You need to have the correct type of tubes, and they need to be biased properly.

What happens when you turn on the amp? Do the tubes glow? What color do the glow (should be an orange-ish glow)?

I recommend doing some research on tubes before you do anything. There's a good thread on tubes here on UG. You can also check out eurotubes.com for information. There are plenty of sites with good info on tubes.
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#4
like test tube babies?
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#5
Quote by TK1
i wouldnt try it. turn it on and see if they glow. the big tubes are preamp, the little ones are power.

also, no, in most cases tubes are not interchangable, and theres a special process you need to go thru to swap out tubes.



actually, small tubes are pre and big tubes are power. i know you can use a multimeter to test the current flow, but it may not tell you how much life is left in the tubes as far as i know.
#7
They make machines to test the bias of tubes and the microphonics and such, they aren't cheap.
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#8
yeah...pretty much all you can do is check voltages (which is pretty useless for diagnosing tube issues), that's about it unless you go and buy a tube tester (see eBay) depending on type, will run anywhere from $100 to $5000 depending on make/model/state of repair.
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#9
If the tubes glow orange then your best bet is some replacements. At least the power tubes they go the fastest.