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Mark III Trace AH250


BassInThePlace
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  • 2 weeks later...

[quote name='Thunderhead' post='306017' date='Oct 14 2008, 08:25 AM']Well, the two I've worked on both had blown and replaced main rectifier diodes (before I worked on them), bridged/repaired circuit traces where the originals had burned out, issues with the pots cracking their joints because the whole thing is badly designed with the entire preamp circuit board suspended from the (very low quality) pots and the jacks, plus nylon standoffs further back which make the whole thing flex as the transformers bounce up and down on the slightly too flimsy chassis, and stresses the front panel joints with every single movement. PCB-mounting pots is not inherently bad, but it must be done such that they are isolated from other forces - ie mounted on a board which is small, light and NOT connected to anything else. Likewise nylon standoffs are a GOOD thing when done properly because they allow movement and reduce shock on the board, but NOT in conjunction with other PCB-to-chassis parts - this is an absolute requirement in proper electronics design for mil-spec applications etc. The design and build quality is almost exactly like the very cheap guitar amps and low-end bass amps they made at the same time, not what should be inside a thousand-pound-plus professional bass head.

It's good to hear you've had no trouble with yours (yet), but on the strength of only two that I've seen, BOTH with problems, I am in no hurry to own one. It's sad to have to say that because they're one of the best-sounding amps I've played through.[/quote]
FWIW, I took some photos of my Trace V8's PCBs earlier in the week just so you could point out to me where all the problems are.
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British Audio Services in the States look like you're best bet for spares, but there is probably a minimum order. Maybe worth getting new rubber feet/corners to make it worth while. I got some bits from a Gavin at GM Audio (?) in Essex - I think he was working from part of the old factory, but I read that he's stopped trading now (someone correct me if I'm wrong about that..)

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