[Milsurplus] TCS crystal oscillator possible tube sub.

[Mike Feher]

How about a 12AV5? - 73 - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
Kenneth G. Gordon
Sent: Friday, February 12, 2016 6:01 PM
To: Milsurplus at mailman.qth.net
Subject: [Milsurplus] TCS crystal oscillator possible tube sub.

I think if I had a TCS, I would substitute a 6K6 for both the oscillator
tube and the buffer tube (filaments are in series) and add resistors to the
tube sockets to correct the voltage.

It uses the same base connections as the 12A6.

I'd add a 16 ohm 5 watt resistor in series with each filament. Or a single
32 ohm 10 watter in series with both.

The 6K6 filament requires 6.3 V at 400 mA and the tube is shorter and
skinnier than the 6F6 so it should fit.

Keeping in mind that one must use a crystal cut for 1/2 the operating
frequency...

I still have not been able to find an octal power pentode with a 12.6 V
filament equivalent to the 12A6.... 

Rats!

Ken W7EKB
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