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A Very Compact Hybrid Amp
Apr 13, 2009 at 2:18 PM Post #796 of 2,218
Yeah, this relay activity is independent of source (it occurs even when nothing is connected to the CTH) and tube--I have tried several.

I think I'll wait for Alex (or someone else?) to chime in to triy to pin down a more specific issue, before I try a more global rebuild. But, that option is out there.

I could almost live with this as a 6v only amp, but I want to use this as a bedside amp and the 6n1ps I have are noisy with my iems. The 12au7s are quieter.
 
Apr 13, 2009 at 2:41 PM Post #797 of 2,218
Quote:

Originally Posted by cfcubed /img/forum/go_quote.gif
same.
SNIP
One general note WRT e12 trips - We do not expect nuisance trips during music, unless due to A/C line flux.
SNIP


It is my understanding that the CRD's should limit AC line fluctuation trips in almost all except most extreme cases.

I have terrible power here at work and do not experience any nuisance trips with the proto or proof builds.
 
Apr 13, 2009 at 2:43 PM Post #798 of 2,218
Quote:

Originally Posted by tacitapproval /img/forum/go_quote.gif
I could almost live with this as a 6v only amp, but I want to use this as a bedside amp and the 6n1ps I have are noisy with my iems. The 12au7s are quieter.


Something is up - I doubt you'll have to live with this amp in "either/or' state. Also, if you need some spare parts, I may be able to save you a little on shipping, let me know.

I have a few bits laying around
wink_face.gif
 
Apr 13, 2009 at 3:03 PM Post #799 of 2,218
A situation like this can be really hard to diagnose.

I'd replace parts in stages. First all the buffer and splitter bjts. Those are most likely to have been damaged if you had shorts on the board. It's almost impossible to tell which one(s) though.
 
Apr 13, 2009 at 3:35 PM Post #800 of 2,218
Ok, Alex, I will change out those parts. Should I throw in the e12 transistors as well? Other parts I should get, while I am at it? Other than resistors, and some caps, I don't have a lot of spare parts.

Bill, thanks for the offer. I will take you up on it, if you have the parts to spare?
 
Apr 13, 2009 at 3:43 PM Post #801 of 2,218
Quote:

Originally Posted by tacitapproval /img/forum/go_quote.gif
Bill, thanks for the offer. I will take you up on it, if you have the parts to spare?


I sent you an email.

It actually sounds like your e12 is working properly. I'd start with the buffer Q's and work from there...
 
Apr 13, 2009 at 5:16 PM Post #803 of 2,218
Does the e12 trip without any headphones with 12au7's?
When i had issues with certain caps tripping e12 it would trip with Senn hd580/600 but not on k501. I would also let the e12 get steady with no phones then plug in phones, issue was solved with new bom parts. Do you have any parts above the board on sips or long leads? anything else directly touching the case like rca or pot?
 
Apr 15, 2009 at 12:21 PM Post #808 of 2,218
Quote:

Originally Posted by sachu /img/forum/go_quote.gif
Do you have an update on your amp? Wondering if you were able to isolate the problem.



A care package is on the way to Tacit with all new Q's - he should get it by the end of the week...
 
Apr 15, 2009 at 12:29 PM Post #809 of 2,218
Quote:

Originally Posted by wiatrob /img/forum/go_quote.gif
A care package is on the way to Tacit with all new Q's - he should get it by the end of the week...


heh...now that's what I call service. I hope to have the two CTH boards on my desk come alive soon.

Good luck with the transplants Tacit..
 
Apr 17, 2009 at 2:51 AM Post #810 of 2,218
Finished casing the first one up, hooray! You can see another three in the background ready to be cased up.

Got through the tops with a holesaw and drill, just clamped it onto some wood and it went through pretty easily. Important to use some oil so it doesn't heat up too much, makes it cut through easier.

Case only gets slightly warm after an hours use, so hopefully I wont have to drill any ventilation holes.
 
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