[ARC5] 12SB7Y - where found?

[Phillip Carpenter]

Ken,

If you search for Lintech Components and IHS for the 12SB7 you'll find they both list it as military replacement stock. I've only seen one 12SB7Y listed and that was by LEEDS back in 2004.

Respectfully,

Phillip W4RTX 

Respectfully,

Phillip W4RTX 

Sent from my iPhone

> On Apr 4, 2016, at 11:50 AM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> 
>> On 3 Apr 2016 at 22:23, 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).
> 
> Really?!?!? I must admit to being very surprised since my checking every 
> possible source for data on the 12SB7Y over the past year or two returned  
> absolutely nothing.
> 
> AFAIK, there were never any 12SB7Y tubes built for normal users, but there 
> most certainly could have been some made on special order for the military. 
> 
> Stranger things have happened.
> 
> I am very interested in where you have seen any 12SB7Ys for sale. I have 
> never yet found any.
> 
> The 6SB7Y was specifically designed for use in early broadcast or home 
> entertainment FM tuners and receivers and exhibits about double the 
> conversion transconductance as the 6SA7 which it can directly replace.
> 
> Ken W7EKB