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Old 19th April 2009, 01:05 PM   #721
labjr is offline labjr  United States
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I'm only wondering which rectifiers sound best in the F5 since it appears there are regular bridge rectifiers in the factory model.
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Old 19th April 2009, 03:43 PM   #722
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Soft recovery type might be the way to go, but I'm sure the experts will have great explaination of what's better.

http://www.referenceaudiomods.com/Me...ry_Code=DIODES
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Old 20th April 2009, 03:34 PM   #723
RonD2 is offline RonD2  United States
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Quote:
Originally posted by bobodioulasso

Did you try to disconnect one channel at a time from psu?
Yes. Connecting either channel one at a time gives the same 24v output.
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Old 20th April 2009, 04:00 PM   #724
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Both channels the same fault!
Logical would say your PSU is the issue.
Sounds crazy?
Did you check the PSU with charging resistors ( bulbs) instead of amps?
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Old 21st April 2009, 06:05 AM   #725
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Quote:
Originally posted by bobodioulasso
Both channels the same fault!
Logical would say your PSU is the issue.
Sounds crazy?
Did you check the PSU with charging resistors ( bulbs) instead of amps?
Sorry for incorrect words.
Instead of "logical" read: logic
instead of "charging" read: loading.
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Old 21st April 2009, 01:37 PM   #726
RonD2 is offline RonD2  United States
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Quote:
Originally posted by bobodioulasso

Sorry for incorrect words.
Instead of "logical" read: logic
instead of "charging" read: loading.

I agree with the logic, but....

I removed one of the boards and tried it in another working amp's PS and it gives the same result.

I built a backup board last night and will test it tonight. If it works then I can troubleshoot the failed boards but I am not sure how best to do that.

Thanks for your help! I really miss the amp.
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Old 21st April 2009, 03:53 PM   #727
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I cannot understand what happened simultaneously to your both channels!
Anyway:
You can serial connect a 110v bulb between mains and the amp, that will allow you some live measurements without burnig components...( do not connect any speaker.)
If no result:
Checking the boards shouldn't be too difficult as they are so simple.
First, have a carefull look at them in case you could notice something wrong. Something burnt, bad soldering...?
If no result, unsolder the the transistors and check them.
If you have new transistors, it may be faster to replace all of them an make a trial with serial bulb connected. (current limiters transistors are facultative)...
What else to check?
some resistors two trimpots, that's all.
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Old 23rd April 2009, 11:06 AM   #728
dinama is offline dinama  Italy
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The boards arrived today.
Many thanks cviller.
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Old 23rd April 2009, 07:13 PM   #729
Ren is offline Ren  United States
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Boards arrived today in perfect condition.

Many thanks, Christian! They look great.

BR,

Ren
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Old 23rd April 2009, 09:10 PM   #730
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Christian -

My boards arrived in today's mail. They all look GREAT; and, the black rectifier boards are absolutely AWESOME.

Many thanks for this Group Buy.

Regards,
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