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FDP Forum / Amp Mods, Repairs, and Projects / On the bench: Peavey Classic 30

Peegoo
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Just beyond Mars

there's a world of fools
Mar 22nd, 2019 12:23 PM   Edit   Profile  

This one came in a few days ago.

It's got a full set of Mesa-branded tubes, as well as a Celestion G12 speaker, which tells me the original Peavey speaker must've blown up. It's quite rare to swap out a speaker on the Classic 30 because Peavey did such a fantastic job matching a speaker with this amp straight from the factory.

The amp works, but the complaint is crackly/poppong noises at all volume levels. I figure the tube sockets need re-tensioning, because this beast looks like it's been rode hard and put up wet.

It may also need re-flow of the ribbon cable connections between the PC boards, because this is a common issue.

Another possibility is the tube sockets' connections to the PC board; Peavey solders these directly to the board (no flying leads like in a classic Fender) and these solder connections sometimes fail.

I'll also do the chopstick test on the large resistors in the power section to make sure they're all sound (heh!).

I have to make a new handle for it because the vinyl is pretty shredded; I could glue it back in place, but that's only a temporary fix.

More to follow.

Pinetree
Moderator Emeritus
(with many stars)

When I was crazy...

I thought you were great.
Mar 22nd, 2019 12:24 PM   Edit   Profile  

There had BETTER be pitchers.





willie

Too Near Atlanta GA

Amp Tech Emeritus
Mar 22nd, 2019 03:49 PM   Edit   Profile  

Ahh yeah, the tri-folded marvel...

Make sure to carefully check the solder connections on the little bus wires that connect the PCBs. They are notorious for developing fractures.

w

SonicBlue

Sunbury-on-Thames

Mar 22nd, 2019 03:54 PM   Edit   Profile  

Last time I had my Classic 20 apart I replaced all the short jumper wires between boards with thick copper wire, so many had become brittle and fractured.

While you have the boards on the bench, ask the owner if he would like the Classic 30 mods done. The boost switch mod actually turn it into something useful.

Classic 30 modifications.

Peegoo
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Just beyond Mars

there's a world of fools
Mar 22nd, 2019 04:12 PM   Edit   Profile  

He just wants the thing to work properly. He's not a gear freak or a tweak monster.

But THANKS for the link to the C30 mods, SonicBlue. I've printed that out and stuck it in my ref book.

(This message was last edited by Peegoo at 07:43 PM, Mar 22nd, 2019)

Peegoo
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Just beyond Mars

there's a world of fools
Mar 22nd, 2019 05:25 PM   Edit   Profile  

The issue was the tube sockets and the tubes. I started by plugging in the amp and tapping on each tube. Two of the power tubes made a huge popping/crackling racket, as did one of the preamp tubes.

Since there's no rear panel or tube cage on this amp, the tubes took a beating. The pins of all of them were bent a bit--probably from getting snagged on the power cable being pulled from the cabinet. Most all the sockets' contacts were loose and needed tensioning. I also cleaned 'em up: I use a piece of an old A string, blasted with CRC contact cleaner, to scrub the inside of the sockets' contacts.

I blasted all the pots with cleaner, scrubbed all jacks with cleaner and a brush, and blew 'em out. Also cleaned the contacts in the effects loop jacks because these sometimes become oxidized and make the amp cut out when nothing's plugged in there.

All the ribbon cable solder joints were fine; no noisy resistors, and the Molex connectors were all good too.

The pinch connectors on the reverb send and return cables are so dang fragile I figured I'd break them just by moving the chassis around on the bench. But they worked fine.

Two chassis mounting screws were missing (there are eight total) because two of the little captive nuts in the chassis were cross threaded by some earlier ham-fisted goober that had this apart. I pulled the captive nuts out and chased the threads with a 10-24 tap, and found two matching screws in my parts bin.

I got it all back together and let it warm up for 10 minutes, and then played it pretty loud for almost an hour. All is good.

This one was easy.

Some pics

Peegoo
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Just beyond Mars

there's a world of fools
Mar 22nd, 2019 05:29 PM   Edit   Profile  

Here's the pic I sent to the owner when I smoke tested the amp and it was all working great.

"Your amp was not sick, it was pregnant! It had a baby on my living room floor."

stratcowboy
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USA/Taos, NM

Mar 22nd, 2019 06:13 PM   Edit   Profile  

While true enough that the stock Classic 30 sounds good straight from the factory, when I had mine I put in a Weber Blue Dog. A significant enhancement in my estimation. If I were ever to get another Classic 30, I'd do that again in a blink.

Leftee
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VA

Knuckleheading
Mar 22nd, 2019 06:38 PM   Edit   Profile  

Nice work!

I had a ‘90s C30 for a few years. I stuck a G12H in it. Not that there was anything “wrong” with the stock speaker.

I’m a speaker tweaker.

littleuch
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Ocala, Florida

#Meat...ooh!
Mar 22nd, 2019 06:57 PM   Edit   Profile  

This thread reminded me that I had a C30 once upon a time. As I recall I got the Delta with the 15" speaker and really dug it, but the verb died a week into it. So I took it back to the store and got the C30. This thread also reminded me that I too had replaced the speaker, a Weber blue dog I believe. It was the amp that I was using in a backyard affair when the cops were called. It was Whipping Post that did us in. Fun amp, but a loud little bugger.

Leftee
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VA

Knuckleheading
Mar 22nd, 2019 07:06 PM   Edit   Profile  

This amp punches well above its weight for sure!

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Mar 22nd, 2019 08:25 PM   Edit   Profile  

I gigged with one of these in the 90s. These little amps kick real butt, and give you boo-teek tone for blue-collar dollars.

I always considered the Peavey Classic 30 the "poor-man's Vox AC30," but even a rich guy was smart to get one because the Peaveys didn't have the nasty habit of catching fire like the older Voxes used to.

Great little amp. Crank it up and it will walk across the floor all by itself.

willie

Too Near Atlanta GA

Amp Tech Emeritus
Mar 22nd, 2019 09:05 PM   Edit   Profile  

One of the Peavey snafu's was not having a grill on the back of the classic series amps to protect the very fragile EL84's...they do make an after market product (or did) that does just that...

Well done Peegoo....you done good.

w

Leftee
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VA

Knuckleheading
Mar 22nd, 2019 09:14 PM   Edit   Profile  

I beleive that later in production they came with a cage.

Leftee
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VA

Knuckleheading
Mar 22nd, 2019 09:24 PM   Edit   Profile  

Posting to confirm that, yes, later amps came with a cage across the width of the back to protect the tubes.

I found this out because I went looking on Reverb to confirm my post above. And I found one. At a nice price. And it’s right here in town.


Crrraaaaaaap!

Dang it!

(-;

Peegoo
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Just beyond Mars

there's a world of fools
Mar 22nd, 2019 09:42 PM   Edit   Profile  

Thanks Yoda [willie]. I have one of those red cast aluminum tube pin straighteners from the 1950s. Works like a charm: plug the tube in and pull it out, and the pins are perfecto.



Leftee, you're such a fish.

You've earned it! haha

(This message was last edited by Peegoo at 11:44 PM, Mar 22nd, 2019)

Leftee
Contributing Member
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VA

Knuckleheading
Mar 22nd, 2019 09:48 PM   Edit   Profile  

LOL

I own it.

Not the amp though. He turned down my offer.

FDP Forum / Amp Mods, Repairs, and Projects / On the bench: Peavey Classic 30




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