Engineer's Amp

rkoonce · 19th September 2010, 05:00 PM

Hi Guys,

I just completed my version of Pete Millett's Engineer's Amp. I must say it's very nice to listen to. I removed the feedback after a listening session because I think it sounds better without. Thanks to Pete for making this circuit available. Excellent design. This amp was built as a studio monitor amp for Shawn Phillips.

Best regards,

Raymond Koonce

Yvesm · 19th September 2010, 06:09 PM

Wahou !

It's so red

kevinkr · 19th September 2010, 06:19 PM

It looks good... and red....

Very nice build quality.

escopunk · 19th September 2010, 06:37 PM

That is great looking, My kinda style.

Good job

SY · 19th September 2010, 06:48 PM

Raymond likes primary colors. Take a look at his other builds.

janneman · 19th September 2010, 08:30 PM

Quote:

Originally Posted by rkoonce

Hi Guys,

I just completed my version of Pete Millett's Engineer's Amp. I must say it's very nice to listen to. I removed the feedback after a listening session because I think it sounds better without. Thanks to Pete for making this circuit available. Excellent design. This amp was built as a studio monitor amp for Shawn Phillips.

Best regards,

Raymond Koonce

Hi Ray,

I'm tempted to get in an order, errr, request, myself

{For the others: I've actually touched and listened to this amp, or at least it's twin. Great amp!}

jan

aardvarkash10 · 19th September 2010, 09:39 PM

we had a marketing campaign that ran for a couple of years here in NEw Zealand for a brand of local beer (Lion Red) the tag line was "Its red, like a fire engine!"

I immediately thought of it when I saw your build...

Sure as its not red like a communist with that line-up of components!

Great looking piece.

rkoonce · 19th September 2010, 11:07 PM

This is the first time I've built anything of this magnitude on a circuit board. The board-stuffing was easy, sort of like paint by numbers, but, no matter how many times you go over that check list, you're gonna leave something out. It was a real facepalm when I found it :-}
The chassis work went really quickly this time. I had a sheet metal shop bend the aluminum and weld in tabs for the ends and bottom cover. I cut all the holes. I had everything powder coated at a local firm. It went from raw chassis to red in four days.
Transformers are as specified on Pete's website from Edcor. Nice transformers and if you order the Engineer's Amp combo, you get a price break. I took the end bells off to have then powder coated and cut threaded rods and used acorn nuts for appearance when I put them back together.
This was a fun amp to build. It sounds great (I prefer it without feedback) on my Cornwalls, *really* loud!

rkoonce · 19th September 2010, 11:10 PM

Forgot to mention, Shawn requested dual volume controls, so that's what I did. I replaced the load R on the circuit board with a really nice miniature stepped attenuator on each channel. I lifted one end of the grid stopper and connected the wiper there. Works like a charm.

19th September 2010, 06:19 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	It looks good... and red.... Very nice build quality. __________________ www.kta-hifi.net

19th September 2010, 06:48 PM	#5
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Raymond likes primary colors. Take a look at his other builds. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

19th September 2010, 09:39 PM	#7
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	we had a marketing campaign that ran for a couple of years here in NEw Zealand for a brand of local beer (Lion Red) the tag line was "Its red, like a fire engine!" I immediately thought of it when I saw your build... Sure as its not red like a communist with that line-up of components! Great looking piece. __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

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19th September 2010, 06:09 PM	#2
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	Wahou ! It's so red

19th September 2010, 06:37 PM	#4
escopunk diyAudio Member Join Date: Oct 2009	That is great looking, My kinda style. Good job

19th September 2010, 11:07 PM	#8
rkoonce diyAudio Member Join Date: Aug 2006	This is the first time I've built anything of this magnitude on a circuit board. The board-stuffing was easy, sort of like paint by numbers, but, no matter how many times you go over that check list, you're gonna leave something out. It was a real facepalm when I found it :-} The chassis work went really quickly this time. I had a sheet metal shop bend the aluminum and weld in tabs for the ends and bottom cover. I cut all the holes. I had everything powder coated at a local firm. It went from raw chassis to red in four days. Transformers are as specified on Pete's website from Edcor. Nice transformers and if you order the Engineer's Amp combo, you get a price break. I took the end bells off to have then powder coated and cut threaded rods and used acorn nuts for appearance when I put them back together. This was a fun amp to build. It sounds great (I prefer it without feedback) on my Cornwalls, really loud!

19th September 2010, 11:10 PM	#9
rkoonce diyAudio Member Join Date: Aug 2006	Forgot to mention, Shawn requested dual volume controls, so that's what I did. I replaced the load R on the circuit board with a really nice miniature stepped attenuator on each channel. I lifted one end of the grid stopper and connected the wiper there. Works like a charm.

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