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PrimaLuna Prologue 5 Issue and schematic
PrimaLuna Prologue 5 Issue and schematic
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Old 2nd December 2019, 06:43 PM   #11
rayma is offline rayma  United States
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Quote:
Originally Posted by vishalk View Post
My thoughts were a psu issue aswell, If I had a schematic I could work my way through it all.
Some of their amplifiers have a HV kill circuit that protects against a bad output tube.
I would look for a bad output tube first, then if the tubes are ok, look at that circuit itself.
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Old 2nd December 2019, 07:03 PM   #12
vishalk is offline vishalk  United Kingdom
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So it is mravimsky! It looks exactly the same under the hood, well you learn something new everyday.

So perhaps I can find schematics for the cayin which will help.
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Old 2nd December 2019, 07:11 PM   #13
vishalk is offline vishalk  United Kingdom
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Originally Posted by rayma View Post
Some of their amplifiers have a HV kill circuit that protects against a bad output tube.
I would look for a bad output tube first, then if the tubes are ok, look at that circuit itself.

I tried different power tubes which were new and working and it was still the same issue rayma, even tried a different preamp and preamp tubes.
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Old 2nd December 2019, 07:12 PM   #14
rayma is offline rayma  United States
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Originally Posted by vishalk View Post
I tried different power tubes which were new and working and it was still the same issue.
Ok, see if it has that HV protection circuit, that sounds more likely to be the problem.
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Old 2nd December 2019, 07:32 PM   #15
Galu is online now Galu  Scotland
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@ rayma - In case it's relevant, there is a plate fuse situated on top of the Adaptive Autobias board.

The manual gives instructions on how to locate and replace it:

http://www.absolutesounds.com/pdf/ma...chures/PL5.pdf

Forgive me if this is too obvious a cause.
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Old 2nd December 2019, 07:52 PM   #16
petertub is offline petertub  Sweden
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PrimaLuna Prologue 5 Issue and schematic
Quote:
Originally Posted by vishalk View Post
Well primaluna won't give me a schematic, rayma they should be fitted as standard with 105c capacitors so they do last long.

I think perhaps the auto bias maybe the issue or one of the capacitors have failed.

I'm going to recap it all and see if that solves the issue. If not then I'll have to send it to get repaired.
One should let primaluna keep their amps if they refuse the customer essential
documentation ! Shame on them ! They gain nothing on hiding the design,
competitors will reconstruct the schematics the only loser is those
poor customers that hve bought the stuff and encounters problems.
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Last edited by petertub; 2nd December 2019 at 07:53 PM. Reason: Spelling
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Old 2nd December 2019, 07:59 PM   #17
rayma is offline rayma  United States
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Quote:
Originally Posted by Galu View Post
@ rayma - In case it's relevant, there is a plate fuse situated on top of the Adaptive Autobias board.
The manual gives instructions on how to locate and replace it:
http://www.absolutesounds.com/pdf/ma...chures/PL5.pdf
Forgive me if this is too obvious a cause.
I don't know anything about these amps, but if there's a fuse, it shouldn't turn on and off like he says it does,
when powered off.
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Old 2nd December 2019, 08:25 PM   #18
vishalk is offline vishalk  United Kingdom
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Quote:
Originally Posted by petertub View Post
One should let primaluna keep their amps if they refuse the customer essential
documentation ! Shame on them ! They gain nothing on hiding the design,
competitors will reconstruct the schematics the only loser is those
poor customers that hve bought the stuff and encounters problems.

I completely agree peter useless service, i even explained the issue and that i would appreciate a schematic.
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Old 2nd December 2019, 08:28 PM   #19
vishalk is offline vishalk  United Kingdom
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Quote:
Originally Posted by Galu View Post
@ rayma - In case it's relevant, there is a plate fuse situated on top of the Adaptive Autobias board.

The manual gives instructions on how to locate and replace it:

http://www.absolutesounds.com/pdf/ma...chures/PL5.pdf

Forgive me if this is too obvious a cause.

Hey Galu! man i checked this fuse and it was ok!
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Old 2nd December 2019, 08:33 PM   #20
vishalk is offline vishalk  United Kingdom
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Thanks to mravinsky for the schematic which the cayin ta-35 which is similar if not the same as the prologue 5


Screen Shot 2019-12-02 at 20.31.42.png
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