[ARC5] 12SB7

[Phillip Carpenter]

Hi All,

I have plenty of 12SA7s on hand. I'm looking for the higher transconductance 12SB7s. 

If none show up I'll sub 6AB7Ys.

Respectfully,

Phillip

Sent from my iPhone

> On Apr 4, 2016, at 8:18 AM, Bill Cromwell <wrcromwell at gmail.com> wrote:
> 
> Hi Les..
> ......Phil..
>      .....Everybody,
> 
> I noticed that I have two of the 12SA7 in captivity here. I didn't find a 12SB7 datasheet/page to compare so I stopped and did not comment. If it turns out that Phil can actually use the 12SA7 I have one in glass and one in metal. I'll run them over my tube tester (to eliminate gross defects) and Phil can have them for the cost of postage. I use USPS First Class postage For U.S. and territories) for items that small and light and it comes to less than the smallest Flat-Rate boxes.
> 
> 73,
> 
> Bill  KU8H
> 
> 
>> On 04/04/2016 02:14 AM, Leslie Smith wrote:
>> 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
> 
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