[ARC5] 12SB7

[Leslie Smith]

Hello Phillip
I cannot help with 12SB7, but suggest you compare the xSB7 with xSA7.
According to the data here, the two have the same pin (base)
function/connection.
The xSA7 has half the conversion gain of the xSB7, and needs double the
bias.
Other parameters are close.  I did NOT check the heater current for the
12SB7!
ESRC sell the 12SA7 for a reasonable price.  The 12SA7 is available from
other sources too.


   73 de Les Smith
   vk2bcu at operamail.com

On Mon, Apr 4, 2016, at 12:23, Phillip Carpenter wrote:
> Does anyone have one or two 12SB7 tubes? These are the same as 6SB7
> except for the filament voltage. If so, please reply direct to me.
> 
> These were made by RCA for the military (I think it was an Air Force
> contract). They are still listed in stock by two military parts suppliers
> (though at extremely inflated prices...you know like the $900 hammer).
> 
> Thank you in advance to all who reply.
> 
> Phillip W4RTX 
> 
> Sent from my iPhone
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