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Username: glocke

Post Number: 49
Registered: 9-2002
Posted on Saturday, June 11, 2005 - 7:14 am:   Edit Post

I recently won a late 60's/early 70's ampeg B25 off of ebay and it looks like it may need some are the issues:

1) No sound output. May be as simple as a tube replacement (tube all the way to the left does not light up, all the other ones appear fine).

2) Getting shocked. While testing it out, I used my series I, plugged in via the 1/4 inch mono jack and recieved a little bit of a shock. Switched to my fender jazz and this did not happen. Interestingly enough, this happened once before with a different ampeg B2 and a fretless elan.

I am in lower bucks PA (close to philly), and would like to tkae it somewhere other than my local guitar ceneter to get it worked on.
Username: keith_h

Post Number: 88
Registered: 2-2005
Posted on Saturday, June 11, 2005 - 5:40 pm:   Edit Post

I can't help you with a recommended repair shop however some basic things you should be able to do yourself if you can locate the tools.
The first thing to do is locate a tube (valve) tester and test all of the tubes (valves). I would check with a local TV repair shop. Radio Shacks used to have them also but I'm guessing they don't in todays world. If you were closer I could dig mine out. While I would highly suspect a tube (valve) that does not have the filament glow, without knowing the tube (valve) type I would not guarantee that not seeing the filament is a problem. On some tubes (valves) they can be hard to see. If you do test the tubes (valves) yourself be sure to note where each tube (valve) goes in the chasis.
I would also verify all fuses are ok and that the speaker/s work.
If none of this resolved the problem then you are into schematics and electrical diagnosis, and unless you have worked with electronics recommend finding a repair shop.

Advanced Member
Username: kungfusheriff

Post Number: 324
Registered: 8-2003
Posted on Saturday, June 11, 2005 - 11:26 pm:   Edit Post

First, can we all stop saying we 'won' something on eBay? We were willing to pay more money for an item than anyone else, period.
Second, you bought a broken amp. Unless the seller described the item as "as-is" you should seek a refund, because there are plenty of B-25s in working order to be had.
That said, Jess Oliver's company had a reputation as the premier bass amp company back then, so I doubt he would have allowed poor designs to hit production. Check the solder joints carefully.
As Keith said, the second thing you should do is try swapping out the tubes for units you are confident are in working order, but only if they are correctly biased and sold as a set. Mis-matched tubes can cause damage, I'm told.
I would hunt for tubes at radio and electronics trade shows...a number of years ago, my Dad, a radio fiend, found a set of NOS tubes for an Ampeg M-15 I then owned at a computer show for a few bucks. That set included several highly obscure tubes, items that usually trade at high price.
Good luck.
Advanced Member
Username: gare

Post Number: 215
Registered: 11-2003
Posted on Monday, June 13, 2005 - 6:07 am:   Edit Post

I agree with the Sheriff about a refund.
You may also want to checkout
I recently retubed one of my Mesa's. They'll sell you a matched set of tubes set up the way you wanted them , hi-gain etc. They're also very easy to deal with, prices are reasonable, and quick. I ordered on Thursday and had them in my hands Saturday.
Good luck
Username: glocke

Post Number: 50
Registered: 9-2002
Posted on Monday, June 13, 2005 - 11:59 am:   Edit Post

thanks for the was sold as seemed like a good price at $200.00, other B25's around here are in the $400.00 and up range...
Username: ctjim

Post Number: 7
Registered: 4-2005
Posted on Thursday, June 16, 2005 - 7:00 am:   Edit Post

I own an older ampeg, mid 70's amp. While perusing the web found a reference to a shop in Lemoyne, PA. Downtown Sound. Supposed to "know" ampeg's, and have a supply of parts. For what its worth.
Good Luck!
Username: glocke

Post Number: 51
Registered: 9-2002
Posted on Monday, June 20, 2005 - 5:45 am:   Edit Post

Just thought I would post an update.
Turns out all it needed was a new tube..found a matched set of tubes for these (extras a buddy had) and it worked great...Still plan on having a tech look at it though....

thanks again for all the replies/
Username: keith_h

Post Number: 99
Registered: 2-2005
Posted on Monday, June 20, 2005 - 6:30 am:   Edit Post

Glad to here it was a simple repair and everything is working well now.

Username: godoze

Post Number: 91
Registered: 10-2004
Posted on Tuesday, July 05, 2005 - 7:54 am:   Edit Post

should you ever need any tech repair you should get in touch with Rob Martyn at dtownguitars.

In doylestown...
Username: glocke

Post Number: 52
Registered: 9-2002
Posted on Wednesday, July 06, 2005 - 1:56 am:   Edit Post

hey, dtown is right down the road from me....I didnt know that store was there...
Advanced Member
Username: dean_m

Post Number: 391
Registered: 7-2002
Posted on Wednesday, July 06, 2005 - 7:15 pm:   Edit Post

Hey glocke,
You can always email Bob at Ampeg for a list of authorized shops.
His email is Tell him Dino sent you


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