Vox AC30-retubing? - Jemsite
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post #1 of 12 (permalink) Old 05-21-2011, 11:08 PM Thread Starter
 
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Vox AC30-retubing?

I'm using a "borrowed" Vox AC30 for shows and practices. Its the singer/rhythm guitar players amp. I play through it because he's mostly on acoustic.

Anyways, we were playing one night, and the strangest sounds were coming out of it. It sounded like radio waves! It has done it a few times, and it crackles all the time. I'm wondering if its in need of a new tube set, or just a cleaning.

It get played about 7 hours a week, for the past year. Thats a fair bit of use. Should i look into new tubes?
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post #2 of 12 (permalink) Old 05-22-2011, 09:09 AM
 
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Re: Vox AC30-retubing?

How old is the amp? Tube amps require regular maintenance. Tubes are just a part of that service schedule. It could also likely need caps, a bias job, a few drifted screen resistors replaced... If you don't know about that stuff it is well worth taking in to a tech for a checkup.
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post #3 of 12 (permalink) Old 05-22-2011, 10:09 AM
 
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Re: Vox AC30-retubing?

Sounds like a bad preamp tube. Likely V1 or the phase inverter.
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post #4 of 12 (permalink) Old 05-22-2011, 10:22 AM Thread Starter
 
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Re: Vox AC30-retubing?

Thanks guys. The amp is probably 2-3 years old, but its only been used for the past year.

I'll take it into to a reputable tech shop. Any idea how much this would cost?
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post #5 of 12 (permalink) Old 05-22-2011, 11:13 AM
 
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Re: Vox AC30-retubing?

Maybe try a different speaker cable first. You can get full retube kits from tubestore, and eurotubes, probably much less that taking it to a shop.
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post #6 of 12 (permalink) Old 05-22-2011, 11:31 AM Thread Starter
 
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Re: Vox AC30-retubing?

Different speaker cable? But its a combo amp.

Would a tube set be around 200$-ish?
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post #7 of 12 (permalink) Old 05-22-2011, 01:05 PM
 
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Re: Vox AC30-retubing?

Yeah, even combos have speaker cables, but an AC30 should have a good one from factory...

A full retube should be cheaper for an AC30 since it uses El84s instead of larger power tubes. Shop around and buy a set of pre's and powers individually. It's only 3 12ax7s and 4 EL84s I think, so it shouldn't be terribly expensive.
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post #8 of 12 (permalink) Old 05-22-2011, 01:10 PM
 
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Re: Vox AC30-retubing?

oh, never even thought of it being a combo.
http://thetubestore.com/vox-ac30cc.html
https://ssl.eurotubes.com/cart/index...ategory_id=131
you can get a all new tubes for under $100
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post #9 of 12 (permalink) Old 05-22-2011, 04:51 PM Thread Starter
 
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Re: Vox AC30-retubing?

Awesome, thanks for letting me know!
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post #10 of 12 (permalink) Old 05-22-2011, 06:03 PM
 
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Re: Vox AC30-retubing?

No problem
Thetubestore is located in canada, so no chance of duty fees
Plus, shipping is reasonable
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post #11 of 12 (permalink) Old 05-22-2011, 06:54 PM Thread Starter
 
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Re: Vox AC30-retubing?

I may do that, or a very good friend of mine is a very reputable amp/electronic tech, I may just take it too him and tell him to do whatever it takes to getting back up to snuff.
He's also a musician, who does all his own amp work.

its good to know all it needs it tubes.
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post #12 of 12 (permalink) Old 05-22-2011, 07:18 PM
 
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Re: Vox AC30-retubing?

Id hope it only needs new tubes.
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