[BC] Gatesway board stuff

[DANA PUOPOLO]

One of the most famous Mac stereo amps was the 275. It was 75 watts per
channel using a pair of 6550's in each channel.

-D

------ Original Message ------
Received: Thu, 27 Oct 2005 11:26:12 PM PDT
From: "Phil Alexander" <dynotherm at earthlink.net>
To: Broadcast Radio Mailing List <broadcast at radiolists.net>
Subject: Re: [BC] Gatesway board stuff

On 28 Oct 2005 at 1:48, Milton R. Holladay Jr. wrote:

> There was a Mcintosh amp that got , IIRC, 80 wats out of a pair of
> 6L6s/5881s using a trick circuit

The Mac I recall was one of the original ultra-linear's and only got
30 W. I recall they got 80 from a pair of 6550's

The ultra-linear used tertiary windings in the cathode circuit and
43% taps for the screens. IIRC Mac built a 160 using PP parallel
6550's. Very low distortion for tubes and iron and terrific quality.


Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037





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