So my Budda SD80 died to day!

[Vrad]

I plugged into my Budda SD80 today. It made a whole bunch of noise. Then turned off and smoke came out. Won't turn back on.

I opened her up and noticed that 2 metal oxide resistors (the only 2 on the board) have black burn marks on them. If I had to guess, I would say these are the B+ decoupling/voltage dropping resistors.

So my concern is...
1) Did they fail on their own?
2) Did they fail as a result of another component failure?
3) Does their failure lead to other component failures.

Any help would be appreciated.

I emailed Budda to see what they can do. So I'd probably wait until I hear from them to before I do anything myself.

 

[Meathead]

Make sure those burnt looking things have cooled down...then put some duct tape on them, you don't want air getting in there and it'll look better than burnt stuff. It should work now.

That's all I got.

 

[Red_Label]

Wow... no advice here, but I wish you the best of luck. I've heard lots of good things about that amp and have been curious about them for a while.

 

[Loudness250]

Wow, that bites! I had a weird thing like that happen to my 2203x reissue. A couple resistors near the hum balance pot fried and the hum balance pot itself went up in smoke and partially melted. I replaced the resistors and tested the hum balance pot to see if it was still alive and then fired it up, It worked and never did that again. I'm not recommending anybody else take a shot in the dark like that but it seemed to be just a fluke occurance with mine.

 

[ratter]

I would shoot an email/call to Jeff Bober at East Amplification too. Budda isn't his responsibility anymore but I'd be willing to bet he replies helpfully...

 

[6AM]

Edit for a better answer :

I would assume those are the screen grid resistors. Replace them, put in new power tubes, and you should be fine.

 

[Vrad]

I would shoot an email/call to Jeff Bober at East Amplification too. Budda isn't his responsibility anymore but I'd be willing to bet he replies helpfully...

I'll do that. Thanks man!
I really don't want to have to do it myself if I don't have to... LOL!

 

[duesentrieb]

I would assume those are the screen grid resistors. Replace them, put in new power tubes, and you should be fine.

Most probably.

You forgot "rebias" though

Good luck, Vladimir

 

[Vrad]

I would assume those are the screen grid resistors. Replace them, put in new power tubes, and you should be fine.

Most probably.

You forgot "rebias" though

Good luck, Vladimir

Hey Olaf,
I was hoping you'd pop in.
Any ideas on what caused them to fail? Think there's something else wrong?

 

[duesentrieb]

I would assume those are the screen grid resistors. Replace them, put in new power tubes, and you should be fine.

Most probably.

You forgot "rebias" though

Good luck, Vladimir

Hey Olaf,
I was hoping you'd pop in.
Any ideas on what caused them to fail? Think there's something else wrong?

How many power tubes are in there?
Which type (EL34)?
What is the rating of the tube fuse (if there is any)?
If there isn't a tube fuse, how is the rating of the mains fuse?

Sorry for the question, but it is for the "diagnosis", Vlad

 

[duesentrieb]

ok, found a pic of the rear: has 4 6L6, no external tube fuse (internal??) . . .

Anything else, Vlad?

 

[Vrad]

ok, found a pic of the rear: has 4 6L6, no external tube fuse (internal??) . . .

Anything else, Vlad?

Yes 4 6L6s. The fuses are on the power jack. But when I opened the amp, those resistors had black burn marks on them. I'll take a picture and post it up here. They were really close to the filter caps. So they could be the screen-grid resistors.

 

[duesentrieb]

Lets wait for the pics. Close to the filters, hmmm, does not sound like . . . ah, lets wait for the pic.

Normally I'd expect four screen grid resistors, but who knows . . .