Audioromy FU13 (813) diagram and mods - Page 3 - diyAudio
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Old 3rd March 2009, 04:26 PM   #21
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THanks, Andy
I think Ill just go sit in a corner now with my 101 reader on tubeamps.
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Old 3rd March 2009, 09:05 PM   #22
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Kroken skal tidlig krkes

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Old 3rd March 2009, 11:14 PM   #23
Cobra2 is offline Cobra2  Norway
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Note, the schematic is "generic"; a simplified mix of 813 and 845 amp from Audioromy.
(There are no 12AX7 in the 813 amp)
@ Andy: (your Norwegian name would maybe have been "Anders Evenes")

Arne K
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Old 4th March 2009, 08:38 AM   #24
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I have been reading Rren und Hren and; being an industrial design engineer with an interest in usability, one thing that strikes me is that it would be better to rebuild the amp with bias measurement and adjustment on the outside. I really like the Classic 16.2 and the Mr Liang amps for this. They even have voltmeter(s) built inn.

Any thoughts on this?
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Old 4th March 2009, 08:56 AM   #25
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(your Norwegian name would maybe have been "Anders Evenes")

No - I'm solid Welsh. When I was a jazz musician I lived and played in Oslo for 6 years (lots of Club 7), and also had the good fortune to do a lot of educational tours round Norway with Rikskonsertene ("the rich concerts"). Learned to speak it fairly well in the end. Lovely place, and some lovely people - some without too much humour and some with absolutely wonderful sense of humour. Interesting immigrant population as well - many quite freaked out by how different Norway is to their own backgrounds. I mean - a country where they bury their fish in the ground and keep cheeses in bed......

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Old 4th March 2009, 10:22 AM   #26
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Ahh yes and Norwegians are known for being nonconformist inventors who never capitalize on their ideas, so in that spirit, here is a sketch of my previous proposal.
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File Type: jpg audioromybiasadjmodule.jpg (31.4 KB, 1238 views)
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Old 4th March 2009, 04:43 PM   #27
Cobra2 is offline Cobra2  Norway
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Good idea, please make me a billet alu-block...

Arne K
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Old 27th March 2009, 02:38 PM   #28
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Default Audioromy 813 rectifier flash

Ive recently observed an unusual phenomenon with my amp; on starting the rectifier tube sometimes emits a purple flash in the top of the tube. Today it also made a small snap sound and it seems the left filament glows earlier than the right, as seen from the front of the amp. It is the standard 5Z3P tube. Any suggestions anyone?
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Old 28th March 2009, 09:43 AM   #29
Koifarm is offline Koifarm  Netherlands
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Trond, i had the same phenomonem. A week later the tube was defect. So get a replacement on reserve.
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Old 28th March 2009, 10:39 AM   #30
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Hi guys,
29 post of discussing mods for the FU-13 and still no schematic ?

Koifarm, you seem to know the machine inside out. You must have drawn one?

Is it UL or triode-strapped?
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