SB-200 users: a question.

[Wilson Lamb]

----- Original Message ----- 
From: "Wilson Lamb" <infomet at embarqmail.com>
To: "RAY FRIESS" <rayfrijr at MSN.COM>; <HEATH at LISTS.TEMPE.GOV>
Sent: Monday, April 19, 2010 5:55 PM
Subject: Re: SB-200 users: a question.


> Well, you are right.  I had forgotten it was 2+KV!
> I expect if one lowered the B+ to 1500 and ran the 811s according to the 
> book, they would last a long time.  I'd only do it if I had some 811s on 
> hand, since they are fairly expensive, like the 572s.  A separate filament 
> xfmr and variac would do it.
> WL
> ----- Original Message ----- 
> From: "RAY FRIESS" <rayfrijr at MSN.COM>
> To: <HEATH at LISTS.TEMPE.GOV>
> Sent: Monday, April 19, 2010 1:29 PM
> Subject: Re: SB-200 users: a question.
>
>
>
>
> One cannot run 811A tubes as direct replacements for 572B tubes.   They 
> will self destruct because the voltages and currents are higher for the 
> 572B tubes.   You can run 572B tubes as direct replacements for 811A 
> tubes, but not vice versa.
>
>
>
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