Hopefully will be a simple repair. They are a very good looking pre-power combo.
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Hopefully will be a simple repair. They are a very good looking pre-power combo.
Thanks Man.
Initial report back from repair:
“Both Output Relays not engaging.”
Looking for schematic/ Service manual now.
:rolleyes:
lots of potential issues with relays alas.. some are sealed as well which leaves only electrical cleaning..or replacement
My amp circuit design knowledge is non existent Grant, so glad somebody smarter than me is looking after it.
But always good to have at least a little knowledge.
Reached out to Densen for Service Mnual/ Schematic as well as on DiyAudio, so see what comes back.
But still...BUMMER!
Hopefully that will be all that's wrong. Annoying, but not the end of the world.
Yes, hopefully an easy fix. Nice looking combo mate. :-)
Aye,
see how it plays out.
Not necessary an easy fix unfortunately, sorry to say Gaz.
If the output relays aren't 'engaging' it could be that the protection circuit is detecting a fault and keeping the relays open.
Possible faults are blown output transistors or faulty psu on one rail.
I hope your 'tech' is sufficiently experienced to work it out, it can be a challenge without a circuit diagram but many amps have similar topography.
Hope it works out OK.
Densen should be able to supply a schematic. I e-mailed Krell for one for the KSA50S, didn't hold out much hope as they hadn't made them in 25 years and they'd changed hands since. Took them just 40 minutes to reply with it.