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Old 10th July 2003, 04:30 AM   #1
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Default DRD: Simpler path to bliss?

Direct Reactance Drive amp:

And in kit form:

The circuit was in Vacuum Tube Valley Magazine a while back.

Welborne Labs have stopped selling other circuits in favour of this, possibly mainly to lower costs. They claim it sounds better than there previous well rated kits (Moondog, etc).

Theyve done a low voltage version in 2A3, 300B & 45s, with either SS or tube rectifier.

Supposed to give excellent detail. No NFB.

I guess that the comparable parts cost is maybe 40% of the Welborne pricing. What do you think?

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Old 10th July 2003, 11:17 AM   #2
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I find it humorous how they show brand names in preference to electrical characteristics, even basic values. And you can guarantee the quality of anything with the phrase "very unique".

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Old 10th July 2003, 11:32 AM   #3
Fuling is offline Fuling  Sweden
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I have built an amp using that topology and Im utterly impressed! Im using 6C4 (EC90) input stages and 12B4A power tubes, chokes and transformers are Hammonds (the cheap 125 and 15X series).

The sound is quite marvellous, in some aspects better than my "serious" 6B4G SE amp.

Give it a try, its an extremly clever topology!
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Old 10th July 2003, 01:25 PM   #4
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I guess that the comparable parts cost is maybe 40% of the Welborne pricing. What do you think?
I Think that all in all you can hardly do it cheaper (Top plate and wooden chassis...transformers dual mono setup) never mind 40% cheaper... If you consider shipping costs etc..etc..

[edit] Ooops saw the nude kits are without the chassis...still think it is priced pretty well.

It sure looks like an interesting topology...will try it in the not too distant future..

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Old 11th July 2003, 12:24 AM   #5
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Default anyone else buil one

FWIW, the designer has a bit of a fan club . . .
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