Audioromy FU13 (813) diagram and mods - Page 10 - diyAudio
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Old 2nd September 2011, 10:15 AM   #91
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Somehow I think it is not your transformer. Take the relay out of the circuit and power it up slowly (do you have a variac)?
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Old 2nd September 2011, 12:23 PM   #92
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I have a variac, and have also considered the relay. Will do that.
But I dont really want to have the amp in my living room any more due to the voltage.
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Old 6th September 2011, 12:16 PM   #93
multi is offline multi  Australia
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Finished modifying the Soundstage 813 to Peter Millets circuit.
Got rid of feedback switch, alps pot and input switch only kept the power supply.
A huge improvement in the sound, screechy treble gone, very dynamic and plenty of bass, can even play Telarcs's Stravinsky Rite of spring. I don't think there is much wrong with the out put transformer on this amp. Using millets circuit ONLY one interstage cap not 4.
Same as the Audioromy 813 impossible to get get a circuit. I was told if they handed out the circuit people would copy it!!!! What a joke.
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Old 8th February 2013, 11:54 AM   #94
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is this amp still available? is there any info i can get? or anyone have one fully working non modified / lightly mod and thinking of selling it?

sorry for bumping an old thread, just super curious about this amp o_O

Thanks.
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Old 3rd October 2013, 03:59 PM   #95
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Quote:
Originally Posted by savim View Post
I replaced the faulty cap for 47uF/160V/105C. Now FU13 works as usual. I believe, that the original cap was from faulty batch. I run the unit more than 3 hours and it was really hot, specially inside. It is american product. Now I will work over the bias to reduce it to ca 65 mA. Then I will try to reduce NFB and see impact on the sound.

Savim
My amp has blown the fuse following what sounded like chattering of a relay. The capacitor adjacent the relay isn't bulging but I presume could still have failed. Does the failing of the capacitor result in the relay chattering? How to easily diagnose a failed capacitor? Any other advise appreciated.
Should i just replace the capacitor and failed fuse and try powering up again?
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Old 3rd October 2013, 07:32 PM   #96
Koifarm is offline Koifarm  Netherlands
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When i had the same problem there was nothing to see at the capacitor.
Just replace the capacitor as decribed earlier in this thread.
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Old 3rd October 2013, 07:38 PM   #97
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Quote:
Originally Posted by Koifarm View Post
When i had the same problem there was nothing to see at the capacitor.
Just replace the capacitor as decribed earlier in this thread.
Thanks Koifarm. I will relace the capacitor and fuse and then try powering up. Many thanks again.
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Old 4th October 2013, 11:33 AM   #98
multi is offline multi  Australia
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is this amp still available? is there any info i can get? or anyone have one fully working non modified / lightly mod and thinking of selling it?

sorry for bumping an old thread, just super curious about this amp o_O
Thanks.
yesman94
These amps are very unreliable. terrible sound unless modified
the power transformer On mine went; a friend of mine bought two of these amps very cheap, both of them had blown power transformers. my friend replaced the transformers and modified the amps to Peter Millets 813 circuit.
Phil
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Old 4th October 2013, 12:09 PM   #99
Koifarm is offline Koifarm  Netherlands
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Hallo Phil,

New amps are not avaible. You have to build them yourself or buy a used one.
I use mine now for 6 years and it is still my best sounding amp ever.

Ronny
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Old 21st October 2013, 01:17 PM   #100
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Replaced the capacitor and fuse and powered it on yesterday. Everything works fine. Thanks for your help Ronny.
I concur that this amp sounds very good and this is my amp of choice amongst various valve and solid state amps. Stupendous value!
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