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Jadis DA30: fuse keeps blowing

Since 8 months I own a 2nd hand Jadis integrated class A tube amplifier. It has worked fine until recently, when the left channel stopped playing, some 60 seconds after power-up. I opened the case, checked for any blown/ destroyed/ burned component, but the only thing blown was the left channel fuse. This I replaced and all was well again. Unfortunately, a few days later the left channel fuse blew again, within 60 seconds after power-up...

I have switched all the tube pairs (left pair to right and vice versa), but the left channel fuse keeps blowing, ruling out a faulty tube. Please note that after replacing the fuse, the amp is playing fine, but after some on/off cycles the fuse pops within a minute after power-up.

Has anyone experienced a similarly vague problem with a (Jadis) tube amp? What could be causing this?

Thanks for your assistance! Bernhard
dudok12

Showing 3 responses by mattzack2

mattzack2's avatar
mattzack2
175 posts
 
Dudok -

Did you resolve your fuse problem? My Orchestra is still in the shop. Tech found one of the Jadis KT88's shorted. I bought a matched quad of Gold Lions and had them installed and biased. Got it home and the KT88's started glowing red when I cranked it up, the sound quality was terrible, and finally blew the external fuse. I brought it back to tech, swapped tubes, and as of today, they are feeding a square wave into it and seeing a lot of distortion. Did Jadis offer you any suggestions?
Matt
mattzack2's avatar
mattzack2
175 posts
 
I have the exact same problem on an Jadis Orchestra Reference. I also replaced the left channel internal fuse, which again blew in just a couple of minutes. I rearranged KT88 tubes from ABCD to CDAB. Fuse did not blow, but bias was way off and sound was horrible. I tried to rebias the tubes but the 120 mV DC was floating up over 200 mV as it warmed up. I have several calls into Pierre Gabriel with no response, and also tried Jadis France. They told me that Pierre was moving locations but would be in touch soon. Right now system is completely down. Please contact me or make your solution public in the Audiogon discussions. Thanks - Matt
mattzack2's avatar
mattzack2
175 posts
 
I still have not heard from Pierre Gabriel after about a dozen phone calls and emails. I am very surprised and very disillusioned about Jadis support.
I am trying to get a recommendation for a Jadis service tech in the Chicago area. I did get a fine recommendation for a Jadis service tech in California, but I am hoping to find someone local.
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