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Help, I fryed my Blues Junior ... can I salvage it? (pics)

Messages
65









Well, the title says it all. I fryed my Blues Junior a few weeks ago after accidentally switching the pre/power tubes and replacing them in the wrong position. Damn thing caught on fire!:thud

When it receives power it will not turn on and I am assuming I fried an IC chip or interrupted signal flow somehow, thus it does not function at all right now. It's a Blues Junior, so I'm not looking to spend a couple hundred dollars to fix it. Any suggestions?

Thanks,
Andrew

PS - I know, I know, what a dumb***
 
Last edited:

shark_bite

Member
Messages
5,189
Check out S2 amps... for some extra money, you might be able to get a really cool amp out of it, and since they gut the BJ insides and replace them with handwired guts, they probably don't need anything you broke.
 

wsaraceni

Member
Messages
7,870
looks like a hole burnt right through the board. i agree with sharkbite. i think with the money you spend having a tech look over it (i assume you'll need a tech since you didnt just fix it already) it would probably be cheaper to gut and put in a handwired board. if not, you could probably sell it to someone who wants to gut one for themselves although i cant imagine it would be worth a whole lot.
 

PatrickE_FenderADV

Silver Supporting Member
Messages
27,459
BillM is on TGP and posts often... maybe he can offer some insight since he is a BJr expert. From my perspective, it's toast and I think the s2 option is on you now. BUT... they're pricey. I think it's over $400. Google S2amps.
 
Messages
65
BillM is on TGP and posts often... maybe he can offer some insight since he is a BJr expert. From my perspective, it's toast and I think the s2 option is on you now. BUT... they're pricey. I think it's over $400. Google S2amps.
Thanks, I'll look into that. Might just sell locally if I can, or possibly part out. It's basically a nice 1x12 cab now ...
 

shark_bite

Member
Messages
5,189
BillM is on TGP and posts often... maybe he can offer some insight since he is a BJr expert. From my perspective, it's toast and I think the s2 option is on you now. BUT... they're pricey. I think it's over $400. Google S2amps.
True, but think of it this way... if you don't have a BJr, it's more like $800. You buy the amp, then you buy the conversion. That's still a pretty good deal considering what they give you back, at least as long as they give you what they say they're giving you - I've never played one myself so I'm not exactly an authority on the subject. If I had a dead amp and it would only cost me $400 to have it wired to the spec of any amp I want, though? I'd probably jump on it, considering the alternative would be a dead amp I cannot use and not just a "lesser" amp (stock BJr in working order). Let's put it this way -- if it were me, I'd be seeing this unfortunate incident as pushing me to try something I've been curious about but never curious enough about to pull the trigger.

On the other hand, the OP has a possible answer right there... see if anyone else is interested in grabbing this thing for a couple hundred bucks and going the S2 route themselves. It'd be cheaper for them, and you could at least get a little money back out of it.
 

big mike

Cathode biased
Platinum Supporting Member
Messages
13,091
Problem is, I don't even think you can get a couple hun for it now.
It fried the board...did it take the transformers with it? The whole thing is now suspect except for the cab and speaker.
 

PatrickE_FenderADV

Silver Supporting Member
Messages
27,459
True, but think of it this way... If I had a dead amp and it would only cost me $400 to have it wired to the spec of any amp I want, though? I'd probably jump on it, considering the alternative would be a dead amp I cannot use and not just a "lesser" amp (stock BJr in working order). Let's put it this way -- if it were me, I'd be seeing this unfortunate incident as pushing me to try something I've been curious about but never curious enough about to pull the trigger.
Very good point... you could pick the 5E3 conversion and turn the BJr into a Deluxe. Get better components and all of sudden you have a killer amp that maximizes your initial investment in the Blues Jr without selling off bits and pieces and losing cash.
 
Messages
65
Very good point... you could pick the 5E3 conversion and turn the BJr into a Deluxe. Get better components and all of sudden you have a killer amp that maximizes your initial investment in the Blues Jr without selling off bits and pieces and losing cash.
Wow, just looked at the S2amps site ... evidently I can turn my BJr into a 1974x, neat!
 

Billm

Member
Messages
574
This is a simple repair. I've fixed a bunch of these. The big 2.2K resistor is very likely the only part that needs replacement, despite appearances.

Loosen the board--instructions on my site: http://billmaudio.com/wp/?page_id=17.

Clip the damaged resistor, R47. Unsolder the stubs from the rear.

Use an X-acto knife to scrape away the burnt, charred portion of the board. Clean up the smoke damage with a little Bon Ami on a damp rag. An eraser helps, too. Inspect the cap for damage, chances are it's fine. If you see any tan foamy stuff around the + lead of any of the filter caps, replace all of them. The IC electrolytics suck anyway.

Mix up some 20 minute epoxy and get some rough-woven cloth. Wet the edges of the burn with epoxy. Soak the cloth with epoxy and patch the hole. Add epoxy to fill. You only need a fingernail-sized piece of cloth.

After it cures, put it back together. It should be fine.

You might want to inspect the ribbon cables for burns at either end, but they're probably OK. It seems like any tube short or operator error (being kind here :) ) just kills R47.
 

JDJ

Silver Supporting Member
Messages
3,671
Time to gut it and put in a tweed Champ or Harvard or Princeton circuit.
 

evanjackson

Gold Supporting Member
Messages
1,346
I did the same thing to my Pro Junior...don't feel bad.
But now thanks to Bill M I can fix it maybe...
 
Messages
65
This is a simple repair. I've fixed a bunch of these. The big 2.2K resistor is very likely the only part that needs replacement, despite appearances.

Loosen the board--instructions on my site: http://billmaudio.com/wp/?page_id=17.

Clip the damaged resistor, R47. Unsolder the stubs from the rear.

Use an X-acto knife to scrape away the burnt, charred portion of the board. Clean up the smoke damage with a little Bon Ami on a damp rag. An eraser helps, too. Inspect the cap for damage, chances are it's fine. If you see any tan foamy stuff around the + lead of any of the filter caps, replace all of them. The IC electrolytics suck anyway.

Mix up some 20 minute epoxy and get some rough-woven cloth. Wet the edges of the burn with epoxy. Soak the cloth with epoxy and patch the hole. Add epoxy to fill. You only need a fingernail-sized piece of cloth.

After it cures, put it back together. It should be fine.

You might want to inspect the ribbon cables for burns at either end, but they're probably OK. It seems like any tube short or operator error (being kind here :) ) just kills R47.
Crap. I sold it. Oh well ... I will pass this on to the new owner.
 




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