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#1
11th June 2012, 02:10 PM
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Help! KAT 6550 schematics and instructions needed
Hi guys.
I'm very sad since I've lost my KAT 6550 schematics and instructions  The worst thing is that my great KAT has gone out of order... and only then I found no schematics around! The problem is that one of the two rectifier heats really a lot and the choke begin to buzz very loud ... I need to double check all the voltage checkpoint and see what has gone wrong.  Please could you be so kind to send me a copy of the complete instruction manual if you have them? Thank you Luca Sfarzo Italy 
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#2
11th June 2012, 02:38 PM
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Re: Help! KAT 6550 schematics and instructions needed
Hi Luca
You Have PM I have KAT 6550 schematics and instructions in Part
__________________
 The Blues man   Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2 If you have trouble reading my posts its because I am a dyslexic member Last edited by colin.hepburn; 11th June 2012 at 03:02 PM.
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#3
11th June 2012, 03:39 PM
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Re: Help! KAT 6550 schematics and instructions needed
Hi Luca, I have had just that problem with a members 6550, the balancing resistors that someone had fitted to the AC side of the 5U4 valves had gone OC on one valve, so the high voltage DC was half wave, do you have these resistors on yours?, they were a mod. to stop rectifier flash over. BOB in cold wet England,
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#4
11th June 2012, 04:17 PM
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Re: Help! KAT 6550 schematics and instructions needed
Email sent Luca
__________________
The Blues man Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2 If you have trouble reading my posts its because I am a dyslexic member
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#5
11th June 2012, 05:03 PM
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Re: Help! KAT 6550 schematics and instructions needed
Hi Bob,
thank you for your hint. As far as I have understood from your reply, those resistors are a mod. I remember that my only design mods were the zener diode bridge and some other minors. I do not not remember I modded the AC side of the rectifier valves. All my other mods were about swapping caps/resistors/cables with better versions (AudioNote, carbon and so on).  Colin has been very kind to me, too, but, unluckily, he has only a part of the KIT instructions. So I'm still looking for someone who can kindly post me such document (a scan version fits the same !).  Please, If you have additional ideas on what may happened, and what I could check, let me know!  Best regards, Luca
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#6
11th June 2012, 05:15 PM
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Re: Help! KAT 6550 schematics and instructions needed
Quote:
I have resent the KAT 6550 but only in part if anyone can help with the full manual for luca pleas pm him
__________________
The Blues man Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2 If you have trouble reading my posts its because I am a dyslexic member
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