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6V6 Amp- my design vs drlowmu design

Posted by sony6060 (A) on January 11, 2017 at 21:05:18

In Reply to: RE: DIY PPP 6V6 Amp posted by drlowmu on January 11, 2017 at 20:19:31:

I built this amp as monoblocks before. Sounded good.

A lot more thought went into this amp that is not apparent in the picture. Being PP type, symmetrical is very important and more so than your SE amps. The power supply is not as critical as SE amps, but is of good design.

On a stereo chassis I tried separate power supplies for each channel and did not like the sound. Some others also like a single power supply vs two on same chassis. Unless monoblocks, two separate power supplies is a mistake on one chassis IMO.

Transformer and choke will have a ferrite lined steel cage. Under chassis top will also have a ferrite shield. Fields will not interfere with each other. Audio transformers will be outside the ferrite shield. This is a choke input power supply. Choke is rated 1.5 x the current being used. A second choke & oil capacitor separates the next stage from power tube stage. Paper/oil caps are used through out.

All leads will be same length. That is why the symmetrical layout. Lead length is important as you know.

Power supply and Heyboer M6 lamination custom transformer has been calculated in PSU2. B+ current capacity is more than double the demand. Choke is 27 ohms or close to your 20 ohm limit.

Input jack that will be in the front center is about two inches from input tube.

All wiring is silver including the ground wire. The ground is placed above the 6CG7s on ceramic standoffs for equal length to all amp grounds. The power supply ground connects at the far end and the ground terminates to chassis only at the input jacks.

The amp will perform fine and layout is not only symmetrical, it is shielded to the point it acts like it is 3 feet square, but without bad news long lead lengths. The ferrite shields allow this short lead length. Which is more evil, long leads or ferrite sheet shielding.

Rectifiers are 5V4G. The rectifiers can be placed anywhere. It has no effect as to the location IMO.

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