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Old 28th February 2005, 02:11 PM   #1
Dave S is offline Dave S  United Kingdom
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Default Leach Low-Tim Amp Finished

I finished my Leach amp about a month ago. It is currently my favourite SS amp out of the 5 DIY power amps I have, it is probably the closest one to the fabled "straight wire with gain".
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Old 28th February 2005, 02:14 PM   #2
Dave S is offline Dave S  United Kingdom
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PCB:
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Old 28th February 2005, 03:22 PM   #3
larryg is offline larryg  United States
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looks great!
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Old 28th February 2005, 07:33 PM   #4
Dave S is offline Dave S  United Kingdom
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Thanks Larryg,

It actually looks better in real life. The pictures made me realise how difficult it is to make things that looks really good - like Peter Daniel does for example.

Anyway I'm very pleased with it, despite the complex wiring it worked straight off. It has no audiophool components in it and it sounds better than all my other SS amps (different to rather than better that my fully Mullarded Leak ST20).

Makes me wonder what all the fuss is about with SE class A, black gates, fancy wires etc etc.

Dave
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Old 28th February 2005, 09:32 PM   #5
Mikett is offline Mikett  Canada
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Nice work. One possible improvement is to cut the angle brackets in half and mount the other half closer to the board. You want the wires of equal length and shorter is better.
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Old 1st March 2005, 07:07 AM   #6
Dave S is offline Dave S  United Kingdom
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One possible improvement is to cut the angle brackets in half and mount the other half closer to the board
Thanks - yes I thought long and hard about this. I would need to start again with the angle brackets and there is also an issue with the thermal compensation diodes. It would need one NPN/PNP pair per angle bracket otherwise thermal runaway may result. As it is, the wires are similar lengths because of the way they are routed. The square wave response into a 2.2uF load are reasonably well damped so the amp has a decent phase margin - I think this is the most important thing and hopefully this means the 6 ins long wires are not an issue.

I can see why people are re-laying the pcb for TO247s!!

Dave
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