According to the datasheets I have from Svetlana, 572B (8/97) is not
the same animal than 811A (3/97). Curves are definitely different.
572 is rated 160 watt dissipation in class B linear RF service, with
graphite plate. 811A is rated 60 W in similar service. Svetlana did
also make a series of 572-xx triodes for audio, all of which were
rated for lower dissipation. These had different curves again.
I would hesitate to say that the 572 and 811A are the same duck,
unless something has changed since the 1997 datasheets were issued.
John
K5PRO
>
>From: EVonvaltie@aol.com
To: <amps@contesting.com>
>Date: Tue, 23 Apr 2002 09:40:27 EDT
>Does anyone have any REAL information which shows any significant difference
>between the 811A and the SV-572. I have looked at the curves for both tubes
>and the curves quack like the same duck to me.
>
>Is this really another tube PR scam like the ones tube mfrs. have been
>running on the audio business for years?
>
>Eric von Valtier K8LV
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