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A Very Compact Hybrid Amp - Page 116

post #1726 of 2213
Thread Starter 
It may mean a bad relay but I am still not convinced. The only way to tell, however, is to try to remove it without damaging the board.

And you are certain that pins 1&12 see 11.5V when the green light is on?
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #1727 of 2213
Pins 1 and 12 are definetly 11.5V when green light is on
post #1728 of 2213
Thread Starter 
Then I guess you'll have to pull the relay and test it out of the circuit. It seems to be the only alternative.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #1729 of 2213
for the cost of the relay and the fact that I dont have any thing to test with .I am considering paying some one to replace it as it may have been my soldering that caused the problem bbut the way I see it the voltage is fine at pins 1 and 12soit must be the relay. It may be a simplistic view but I think if the relay is being removed it may as well be replaced
post #1730 of 2213
Thread Starter 
OK. Please keep us informed on how you are doing. We need to have another CTH working!!!
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #1731 of 2213
it will take about a week for parts then i will let you know the outcome
post #1732 of 2213
I think this is going to have to be my next build. Is the BOM on the site updated with the latest recommended parts?
post #1733 of 2213
Quote:
Originally Posted by aphexii View Post
I think this is going to have to be my next build. Is the BOM on the site updated with the latest recommended parts?
Yes, it has been changed.
post #1734 of 2213
Quote:
Originally Posted by sachu View Post
Yes, it has been changed.
Excellent, thanks!

Now to dig through my parts drawers and see what I already have before I place my mouser order
post #1735 of 2213
Quote:
Originally Posted by runeight View Post
Billyk these voltage are all well within spec. Are you having any further problems?
Sorry for the delay in answering, no internet!
Anyway, things are just great! It was the tube. When I swapped it back in the trouble came back. So I have a live and kicking CTH.
I really love this little beauty. I am just in awe of the wonderful noise it makes and had a blast building it. Only two issues to troubleshoot, a cold joint on the pot made for a loud buzz and the bad tube that was giving me the distortion issue.
Having trouble picking out a favorite tube, have a 12BH7A in there now. The clarity and definition are astounding, even with my poor ol' Senn 515s. Like I said in my sig. gotta stop building this stuff and save for some good cans!!
post #1736 of 2213
Thread Starter 
Great to hear that all is working now and that you like the amp!! If you have some time, I'm sure we'd like to hear your further listening impressions.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #1737 of 2213
I have a BOM question. Both digikey and mouser are out at least part of the BC337/25 or BC327/25 sets. Are the BC32725TACT-ND and BC33725TACT-ND at digikey suitable? I see no difference spec wise and suspect it's a packaging difference. Surprised that they are half the price of the other ones. Also is 604-1061-ND ok for C1L,C1R? Only difference I see is voltage stuff. Sorry for the stupid questions, just not positive of compatibility. Thanks!
post #1738 of 2213
Thread Starter 
My quick look says you're ok on both counts. The cap will fit and the transistors seem to be the 25 class.
Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #1739 of 2213
Huzza!! Yet another CTH lives.. This one was a courtesy build for Kabeer who is going to power the legendary Yamaha YH-1000 with it.

The CTH with the power up problems has been fixed as well..
post #1740 of 2213
YOU should know that it's IMPOSSIBLE for an amp like the CTH to power any amp with a model ending in 1000 (YH-1000, K-1000)!
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