[Amps] Replacing 811A with 572B

[jeremy-ca]

----- Original Message ----- 
From: "Peter Voelpel" <df3kv at t-online.de>
To: <amps at contesting.com>
Sent: Thursday, April 10, 2008 10:13 AM
Subject: Re: [Amps] Replacing 811A with 572B


> What is the difference bewteen 811 RF tubes and 811 audio tubes?
> Where was the Svetlana 811 built?


The black based ones were built in the Ukraine

I believe the later ones are Russian built by one of the audio tube 
companies. Sovtek?

I use Russian 811/572 only for modulator use and have never had problems.

Carl
KM1H