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Re: [Amps] 572B/T160L tube class C

To: <>, "Aleksandar Petkovic" <>
Subject: Re: [Amps] 572B/T160L tube class C
From: "Carl" <>
Date: Fri, 20 Aug 2021 10:57:14 -0400
List-post: <>
Those spec sheets have been around for decades BUT:

Has anyone ever seen an O'Malley?

The Svetlana was not a true 572B clone, the anode was smaller and the plate dissipation lower. It did not work well in some amps due to instability, not a problem if you knew how to tame them. I ran pairs in several SB-200 6M conversions with no problems at 600W. Pulled off the market years ago as well as their make believe 811A which was a relabled Ryazan G-811 (their logo still visible under the new paint) which dates back to WW2 when a B-29 crash landed in the Far East after bombing Jap locations. They copied the plane as a TU-4, the ART-13 TX which used 811 modulators and seriously updated versions are still flying aka the "Bear" nuclear capable heavy bomber.


Message ----- From: "Aleksandar Petkovic" <>
To: <>
Sent: Friday, August 20, 2021 12:30 AM
Subject: Re: [Amps] 572B/T160L tube class C



73, Alek, VK6APK

On 20/08/2021 8:56 am, Fuqua, William L. wrote:
I am looking for full power data for the 572B/T160L operating ICAS class-c CW and AM. The only thing I have found thus far is in an ARRL handbook, but it is obviously the 811A specs.
Not the full 160W plate dissipation specs.

Bill wa4lav

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