[Milsurplus] BC-9A replica

[Al Klase]

Take a look at triode-connected audio-output tubes like 3V4, 3A4, etc.  
3A4 would be my starting point. - Al

On 2/12/2017 10:18 PM, Kenneth G. Gordon wrote:
> Hmmm....#30s are medium-mu triodes, and the 1H4 is a direct replacement,
> transconductance is around 900 uMhos.
>
>  From what I have so far been able to find out, the VT-1 is a low-mu triode, maximum plate
> voltage, 60 VDC.
>
> So, anyone have any idea of a low-mu battery triode?
>
> The 12B4 (mentioned here previously) is listed as a low-mu triode, yet its transconductance
> is 6300 uMhos.
>
> Interesting.
>
> Ken W7EKB
>
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/