Help Ariand f34bMk1V

Dave MacFarlane

Dave MacFarlane

Joined
Nov 20, 2015
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Location
Fife, Scotland
Fuse blew - did usual - removed all valves, left speakers in - blew again - found MR67 diode 5ohms either direction - got diagram forced out of Yarland - o/p and P.S, but didn't resemble P.S - 200 ohm res excluded and FW rect. not right diagram - no time to trace cct. - replaced MR67 and schottky diode, still blew fuse - need wizard to say - oh, that's OK, its just component x,y,z. - save my amp!
Any ideas as to where to go next? I am not right up on valve Power supplies, and I can't figure the half schottky - only one side is connected.
Dave.
 
Yes, Peter, I am proud and unproud to say - I should have removed the valves on the second attempt - I replaced the diodes yet again ( I had craftily ordered 4), and switched on with no valves - OK - then put back 1 valve at a time (Ionly did this with the el34's - from my experience, this is what goes - but you can do this with the little valves as well) - one of the valves supplied was slightly different shape than the rest - I left it till last - each time switching off between changes - lo and behold, that valve blew the diode - fortunately I had a matched pair EL34's from my Marshall guitar amp - replaced diode again - inserted new pair, and hey presto - hasn't hiccoughed in a year!
If it proves to be a valve, buy a matched pair - you can get them from Watford valves, from about £30.00 matched pair.
Good luck, feel free to come back to me.
Dave.
 
Have you had any luck? did you manage to fix your amp? If you are short of specialists,
If you need me, I can repair it for you for a small fee, and guarantee it.
Dave.
 

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