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markp 18th June 2004 04:02 PM

Pictures of my amp
2 Attachment(s)
I finally got some pictures of my amp. It is dual mono with voltage regulation on the input/driver stages fed from a seperate winding on the transformer at a higher voltage. There are 4 pairs of outputs per channel with a 6800uF cap bypassed by a polystyrene next to each output, a total of 8x6800 per side. All parts are 1% where possible. Caddock, Holco, and Mills resistors are used throughout. It is based on my schematic that I posted last week. It has been on for 6 years and is played hard almost every day. I designed a two stage power switch which lets the input/drivers stay powered while the outputs can be switched off to save power letting the amp stay warmed-up all the time.

markp 18th June 2004 04:04 PM

picture number two
2 Attachment(s)
input/driver and voltage regulator boards

karma 18th June 2004 04:27 PM

wow its big how manny watts is it?

markp 18th June 2004 04:45 PM

Very conservatively, its 200 watts into 8 ohms. I get close to 400 into 4 ohms. When unplugged it plays for several minutes at normal levels!

karma 18th June 2004 04:52 PM

nice im going to add it to my picture gallery;)

markp 18th June 2004 07:54 PM

I forgot to add that all boards are 1/8" thick two ounce copper that I etched myself with the dry transfer method. All wiring is teflon silver with 10ga used on all power rails post bridge. The case is T6061 aluminum ranging from 1/2" to 1/8" thick depending on usage. Input RCAs are WBT and output bindingposts are Edison-Price. Total weight is 75lbs including two 10lb+ torodial transformers.

Brian Donaldson 18th June 2004 09:11 PM

Nice home brew heat sinks!

markp 18th June 2004 09:18 PM


Originally posted by Brian Donaldson
Nice home brew heat sinks!
They really do the job too. I have never seen them get anything more than warm even with some ugly two ohm loads.

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