Tube Amp Archive

the location which the bad cap was in is at the tip of the arrow, now it is the reddish cap.

Hi Everyone and thanks for your help. I now have afully functioning - except for some dusty pots, Klemt S100 amp. I replaced the 47uf caps I had blown by wrong orientation with the one Structo suggested: F&T 2x32uf http://www.tubesandmore.com/products/C-EC32-32-500FT I replaced the 1K power resistor...

Yes, the possibility that the caps are dust has occurred to me, I already ordered a new, more suitable cap, (more like the caps in the schematic than that old atom was) see above link, to replace both with, an F&T 32 32 500V, this should arrive before the new power resistors. I agree with the divide...

I purchased some 25W wire wrapped that seem like they will work.

I am wondering why it fried since it spans the 2 caps I just replaced.

Ideas welcome

Yes, the capacitors I replaced connect at points 1 and 2 for the positive leads, similar to the schematic. I am replacing the 2 caps with one F&T : http://www.tubesandmore.com/products/C-EC32-32-500FT As a kind fellow suggested above. This is a 32 32uF 500V which seems more similar to the schematic....

I hadent seen your replies above. Correct that it is a 40 40 and I replaced it as I mentioned with 2 47uFs which should be OK according to other info I looked at saying that the 40 40 was the same as 2 40uF caps, so replacement with 2 47uf s might have worked, but, the problem still persists and the...

Replaced the big old ATOM Dual cap with 2 47uF capacitors. First put them in backwards and that blew the fuse, then turned them around. When I turned on the amp, the tubes did the same climb up in ma draw to >200, as I was observing this, the power resistor suddenly smoked and melted. This is a 1K o...

Hi all, again thanks for the help. I will try to take some of the measurements tomorrow. I was ordering some new capacitors and had an issue with replacing this 40mfd sprague atom electrolytic cap in that the original cap has 2 leads coming out of the positive side, (and one in the negative). I was ...

Hi, you guys are great. TO answer a few questions at once: I have tried changing polarity (switching the AC leads). THe bias pots are the little white wheeled things in this pic. THey seemed to work fine, but I can check them with a meter. THis big electrolytic cap, a sprague ATOM 2740 450V 40mfd is...

Thanks, there are no known schematics of this unit. Here are some pictures though, and it seems like the circuitry is very simple. The top has 4 EL34s, I do have a matched set but since they are getting toasted I am using some old ones. THe bottom of the board has this metal tube which prodcues the ...

Hi, it has adjustable bias, there are small pots. When it is stone cold, it allows proper biasing to 45ma , but, after about 10 minutes, if I check again, the ma will climb to> 200 ma and the output will become distorted then fade away. There are some caps as well as a goofy german power supply/tran...

Hi, I have a Klemt S100 100W amp with 4 EL34s, 3 ECC808s and one ECC82. When I turn it on it is great and I biased the tubes to 45ma each. But, after a couple of minutes it heats up and if I check the tubes they are pulling over 200ma, the sound also goes bad, crackly and then fades as the tubes get...