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FDP Forum / Amp Mods, Repairs, and Projects / Peavey C30 died

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picnic
Contributing Member
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NJ/FLA

I like guitars and amps
Mar 12th, 2017 06:45 AM   Edit   Profile   Print Topic   Search Topic

I was getting some static and checked the tubes. Power tubes were fine. one preamp 12ax7 made some scratchy noise and the amp sound stopped.

Pre amps are cold, EL84's still light up. I'll get 3 12ax7's tomorrow. I also found on the local CL, another C30 in tweed, old style front. Probably get that one for $250-275. I like these C30's.

Any ideas of what might have happened. As far as I know, the pre's are original. I put in new JJ EL84's back in December

ultra80096

USA

Mar 12th, 2017 08:01 AM   Edit   Profile   Print Topic   Search Topic

From what you describe, probably just a preamp tube. The filament heaters are wired in series so if one goes, they all go.

My experience with my Delta Blues 115 was a sudden "nothing". Got brave, pulled the chassis, unfolded the circuit boards & found a broken wire jumper. Replaced that & it's all good again.

SonicBlue

Sunbury-on-Thames

Mar 12th, 2017 08:23 AM   Edit   Profile   Print Topic   Search Topic

The wire jumpers in Peaveys turn quite brittle with age. The last time I had my C20 apart (to do some tone stack mods) I found several had broken after I opened out the boards. I ended up replacing them all with heavy gauge copper wire to stave off further problems.

ultra80096

USA

Mar 12th, 2017 08:28 AM   Edit   Profile   Print Topic   Search Topic

Yeh, I was thinking at some point doing the same, next time I have it apart. It's a '93. Did you use stranded wire, or solid?


willie

Too Near Atlanta GA

Amp Tech Emeritus
Mar 12th, 2017 08:48 AM   Edit   Profile   Print Topic   Search Topic

The classic 30 is notorious for solder joint fractures in the filament circuit. The amp is built on a tri-folded PCB, with many vital voltages feeds using small gauge solid core wires from one PCB to the next...over time they tend to fracture and render all sorts of failures; especially the loss of filament voltage.

w

Peegoo
Contributing Member
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The spotlight

looks like a prison break
Mar 12th, 2017 08:52 AM   Edit   Profile   Print Topic   Search Topic

picnic, if you're savvy with draining the filter caps, try re-flowing all the solder joints on the jumpers. Use a very clean, hot iron and a dot of fresh solder on each one.

Be *very* gentle when handling the three boards together.

SonicBlue

Sunbury-on-Thames

Mar 12th, 2017 02:02 PM   Edit   Profile   Print Topic   Search Topic

Ultra, I used solid copper wire.

picnic
Contributing Member
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NJ/FLA

I like guitars and amps
Mar 12th, 2017 08:47 PM   Edit   Profile   Print Topic   Search Topic

thanks for all the advice. I watched a couple of YT vids on going inside a C30 and doing cap replacements. the triple folded boards look fragile. Probably over my pay grade.

good news is I scored another C30 tweed cab off craigslist this morning for $250. Gigged with the amp this afternoon and it sounded fine.

Hammond101
Contributing Member
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So. Cal. USA

Mar 13th, 2017 10:01 AM   Edit   Profile   Print Topic   Search Topic

These are famous for breaking the jumpers as Willie says. In the early amps Peavey used the jumpers as structure to support the board. They later added support to the middle board and the amps became a bit more reliable.

Those jumper/buss wires cam be replaced but it is a bit of a pita. Once one fails they are all due for replacement as they have become weak. Also a pita is the way you must contort the boards to get them out of the chassis. Also there is no real way to test your work until you put the boards back in. The amp does sound good however.

These are my 2nd least favorite amp to service. The Vox AC30 reissues from China being my least favorite.

willie

Too Near Atlanta GA

Amp Tech Emeritus
Mar 14th, 2017 07:22 AM   Edit   Profile   Print Topic   Search Topic

Hammond101- Ditto on the hierarchy of PITA amps to service :-).

It is reassuring to know there are proficient and knowledgeable techs on here keeping the faith after many of us have either passed on or taken a back seat in the rocking chair. :)

w

Peegoo
Contributing Member
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The spotlight

looks like a prison break
Mar 14th, 2017 09:02 AM   Edit   Profile   Print Topic   Search Topic

NURSE! Get that man his tapioca!

And a soldering stick!

willie

Too Near Atlanta GA

Amp Tech Emeritus
Mar 14th, 2017 10:27 AM   Edit   Profile   Print Topic   Search Topic

I hate tapioca!!! :)
Hey, all good things do come to an end sometimes, and I figure 54 years was enough...then you try to find new good things...such is the case :)

I think back on the amp techs I've met on here from way back '99, 2000 and so...and there were several that became good friends, allies and business cohorts...some just "runnoft", some were chased away, some passed away, and some just faded away, and a few are still lurking here.

Lot's of lore and logic laced with luck has been passed on here. There was a time when I would get many emails a day asking for tech advice. So much so that at one time, I spent a couple hours a day, in addition my job of actually working on amps and guitars, answering tech questions via email and on-line. It is gratifying to know there are some good techs hanging here that know their stuff and continue to help folks with tech issues.

Now back to the subject at hand....hope the Classic 30 gets back to work soon.

willie

(This message was last edited by willie at 12:29 PM, Mar 14th, 2017)

Hammond101
Contributing Member
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So. Cal. USA

Mar 14th, 2017 10:52 AM   Edit   Profile   Print Topic   Search Topic

Thanks Willie, that means a lot coming from you.

As for the tapioca, it might be a good thing. I'm having back issues this week. Ouch! Putting an amp up the bench would not be fun.

willie

Too Near Atlanta GA

Amp Tech Emeritus
Mar 14th, 2017 12:12 PM   Edit   Profile   Print Topic   Search Topic

It will wear on you after the years my friend...on that you can be sure. ;)

w

Bubbalou

USA

THE LOW END OF UPPER TEJAS
Mar 14th, 2017 01:32 PM   Edit   Profile   Print Topic   Search Topic

"It will wear on you after the years my friend...on that you can be sure. ;)"

Yep, that is why I sold my 27lbs GK amp head and bought a 6lbs Genz Benz amp head and to Small 12" Neo cabs for bass.
Two of the heaviest amps I had to repair was a 1965 Fender Super Reverb and Twin Reverb amps. After 2 back surgeries I can not longer lift heavy stuff

Hammond101
Contributing Member
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So. Cal. USA

Mar 14th, 2017 02:02 PM   Edit   Profile   Print Topic   Search Topic

I had a guy bring be a Quad Reverb last month. No casters. Fun......Not!

I'm usually pretty durable however I tweaked my back over the weekend changing the jib on my buddy's sailboat. Pain and pleasure all at once.

Peegoo
Contributing Member
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The spotlight

looks like a prison break
Mar 14th, 2017 02:04 PM   Edit   Profile   Print Topic   Search Topic

Oh...you're talking about heavy amps.

I thought this was about tapioca wearing on you.

As you were.

picnic
Contributing Member
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NJ/FLA

I like guitars and amps
Mar 14th, 2017 03:41 PM   Edit   Profile   Print Topic   Search Topic

so the C30 I bought Sunday morning, gigged with Sunday afternoon up and died Sunday night when I plugged in at home. So now there's two out of commish.

I did some searching for amp techs around Ft Lauderdale and found a good one I think. Over the phone he knew the amp and has worked and dozens. The C30 is a popular amp at the Univ of Miami and he has fixed plenty.
I took the amp to his shop and it turned into an hour BS session. So lets see how the fixes and prices go. $65/hr bench time

Back to remodeling the new house. The Mrs said my break is over

Hammond101
Contributing Member
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So. Cal. USA

Mar 14th, 2017 04:22 PM   Edit   Profile   Print Topic   Search Topic

Shucks, sorry to hear that. If it's a bus wire have him change them all and increase the wire gauge.

Building a support for the center circuit board with a piece of aluminum angle and a couple of stand offs should keep it from happening again.

picnic
Contributing Member
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NJ/FLA

I like guitars and amps
Mar 15th, 2017 08:13 PM   Edit   Profile   Print Topic   Search Topic

a bad JJ EL84 killed the first amp. When the 2nd amp started humming, I swapped out the power tubes and unknowingly put the bad JJ in. Toasted the second amp. I bought the JJ's new in December.

both repairs are the same. some parts, tubes and bench time.

Next 20 Messages  

FDP Forum / Amp Mods, Repairs, and Projects / Peavey C30 died




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