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An interesting amplifier find

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Posted on December 24, 2020 at 10:06:56
Byrd69
Audiophile

Posts: 2881
Location: East Syracuse, New York
Joined: August 23, 2004
 A friend called me yesterday to ask if I had the March 1961 issue of Electronics World. The reason he was asking is that he bought an amp that is topic of an article published in this issue. I checked....I do have it....in mint condition of course. Interestingly, the amp turns out to be the amp that is featured on the cover of the magazine.

Magazine link below....page 29.









Your interest may vary but the results will be same. (Byrd 2020)

I can't compete with the dead. (Buck W. 2010)

Cowards can't be heroes. (Byrd 2017)

Why don't catfish have kittens? (Moe Howard 1937)

 

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Sad thing is..., posted on December 24, 2020 at 11:45:38
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 I once had that signal generator. Bought it for about $5 from somewhere?

My father was a foreman in a factory that built custom order government contract transformers. I remember those oscilloscopes. They weighted as much as my first car.

 

Onlyist thing in that picture that I want.., posted on December 24, 2020 at 15:52:29
Ivan303
Audiophile

Posts: 48887
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
 is the guys shop coat.

OK, maybe the hair.




First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass

 

RE: Onlyist thing in that picture that I want.., posted on December 28, 2020 at 12:10:05
Palustris
Audiophile

Posts: 2408
Location: Cape Cod
Joined: September 12, 2008
 "Onlyist thing in that picture that I want is the guys shop coat."

That's a big mistake. I once found that same type HP signal generator and inside was a GZ34 that has now been in a range of amps and is still going strong after a decade. In that O'scope are a dozen 6922 family tubes. The amp itself looks very interesting and probably could be made to sound great with some new caps and a few circuit changes.

 

RE: "In that O'scope are a dozen 6922 family tubes"...., posted on December 30, 2020 at 08:08:40
Ivan303
Audiophile

Posts: 48887
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
 Those 6922s are likely abused beyond recovery.

Spent many an hour at the legendary Salt Lake Instrument digging through the MILLIONS of tubes in the late Bill Davis' inventory. Many 6922 'pulls' marked HP and Tektronix. The pulls were almost universally abused, noisy and otherwise not worth having. But did acquire quite a few Tektronix tubes still in the sealed tubes and HP labeled tubes in the small boxes.

Plus a bunch of Amperex ECC83 marked E for M, both pulls and new in boxes. Some of the 12AX7/ECC83s 'pulls' tested and sounded good, even in phono stages. Guessing it was because the E for M (Electronics for Medicine) gear was physiological monitoring equipment designed to measure and chart VERY small wave forms (heart and brain waves) and as such I would bet these tubes were per-selected for low noise.











First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass

 

RE: An interesting amplifier find , posted on January 8, 2021 at 23:24:51
Triode_Kingdom
Audiophile

Posts: 10044
Location: Central Texas
Joined: September 24, 2006
 Do you mean he bought a clone constructed in accordance with the article? Or does he have that exact amp?











 

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