[ARC5] A.R.C. Type 21 - submini tubes.

[w4thq at cox.net]

They were also used in the BOMARC for all the Section 41  AFT electronics: guidance and telemetry packages.  By the way, the telemetry RF output amplifier  used two 4-125A's, another tough tube.
John W4THQ
 ex Boeing Pilotless Aircraft Division engineer c1958-59

---- "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote: 

=============
On 26 Apr 2012 at 7:00, D. Platt wrote:

> head for it.   I also have a bin with a number of the sub-min tubes
> for spares.  I haven't ever had to replace one but they're there in
> case.

IMHO, the submini tubes are the very, very best of the vacuum tubes. I have 
never had to replace any of those that have appeared in the equipment I 
own, which includes the RCA SRR-11/12/13 receivers.

Those tubes are really incredibly reliable and tough.

I suppose they would have to be since many were designed to be shot out of 
anti-aircraft guns in proximity fuses.

Tough little buggers.

Ken W7EKB
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