Leach Low-Tim Amp Finished

Dave S · 28th February 2005, 02:11 PM

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".

Dave S · 28th February 2005, 02:14 PM

PCB:

larryg · 28th February 2005, 03:22 PM

looks great!

Dave S · 28th February 2005, 07:33 PM

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

Mikett · 28th February 2005, 09:32 PM

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.

Dave S · 1st March 2005, 07:07 AM

Quote:

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

28th February 2005, 03:22 PM	#3
larryg diyAudio Member Join Date: Feb 2004 Location: cary,n.c.	looks great! __________________ larryg

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28th February 2005, 07:33 PM	#4
Dave S diyAudio Member Join Date: Mar 2003 Location: Searchin' for Sweet Singletrack	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

28th February 2005, 09:32 PM	#5
Mikett diyAudio Member Join Date: Aug 2003 Location: Toronto	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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