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Old 26th June 2018, 01:02 AM   #8361
Refugee1 is offline Refugee1  United Kingdom
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I have seen so many well polished amps here that I could not resist.
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Old 28th June 2018, 06:49 PM   #8362
hectori is offline hectori  Chile
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Other Projects finished

7591A PP Design

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45 SE With D3a and 83 Tube

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Phono Preamp (With my also DIY Garrard 401)
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Old 29th June 2018, 12:35 PM   #8363
lexx21 is offline lexx21  United States
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Geez Hectori.....is there anything that you don't build to absolute perfection? You have done amazing work!
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Old 29th June 2018, 04:28 PM   #8364
Carlp is offline Carlp  United States
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Quote:
Originally Posted by hectori View Post
Other Projects finished

7591A PP Design
Wow, nice!
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Old 3rd July 2018, 05:08 PM   #8365
sunil is offline sunil  India
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Beautiful Hectori
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Old 3rd July 2018, 11:43 PM   #8366
mhouston is offline mhouston  Australia
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DHT2009, very neat. Looks pro.
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Old 16th July 2018, 12:32 AM   #8367
Mr_Zenith is online now Mr_Zenith  United States
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Default Thomas Mayer Monoblocks

Hello all,

I finally completed my first build in nearly nine years, a pair of monoblocks built to Thomas Mayer's "Low Cost" design. Despite its origins as an economical build, I simply viewed this as an engineering exercise; the money not spent on interstage transformers went toward decent OPTs, top-notch hardware, and beefy construction.

Chassis is quilted maple with bubinga feet and trim; top plate is 0.180" thick aluminum. All fasteners are 18-8 stainless, and the tube sockets are genuine Johnson ceramics picked up from local hamfests. The OPTs are a pair of James 6123s I purchased from a member of another forum. All wiring is point-to-point with 14 gauge solid copper wire used as a ground bus.

The large box at the rear of each conceals an Antek AS-1T350 toroidal transformer, which is mounted vertically on an aluminum 'L' bracket due to space constraints. They're absolutely perfect for this project. Both amps have a combined weight of 55 lb. (20.4 kg), and took four months of work.

Was it worth it? You bet - these things sound absolutely incredible! This was my second SE project, and I wasn't disappointed. Thanks to Thomas for sharing this design!
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Last edited by Mr_Zenith; 16th July 2018 at 12:38 AM. Reason: Johnny can't reed...
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Old 16th July 2018, 01:07 AM   #8368
Mr_Zenith is online now Mr_Zenith  United States
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And a quick shot under the hood...
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Old 16th July 2018, 01:09 AM   #8369
jdrouin is offline jdrouin  United States
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Wow, they look gorgeous Mr_Zenith? What’s the tube compliment? I think I see a 6N7 but can’t make out the rest.
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Old 16th July 2018, 01:29 AM   #8370
Mr_Zenith is online now Mr_Zenith  United States
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Thanks! I'll do you one better - the entire design can be found here.

Don't let the simplicity of the schematic fool you: this circuit is excellent. The bass is tight and controlled, and the mids/highs are neutral, as they should be in a well-designed SE amp. And the power supply is dead silent. This is not an "effects box" by any means.

BTW, the only changes I made to the schematic were omitting the ground lift switches and adding a CL-90 to each PT primary to control warmup. However, I will warn anyone reading this that there's another reason besides cost that most stereo builds aren't monoblocks. The effort involved is more than twice that of a single-chassis build - especially if you're building mirror-images.

Last edited by Mr_Zenith; 16th July 2018 at 01:36 AM.
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