[BC] The ultimate radio?

[Jack Antonio]

KTVN Channel 2 - 4925 Energy Way - Reno, NV 89502
775-858-2222 - Fax 775-861-4298



There were a number of military sets that ran off 24V for both
filaments and B+, The R-392, BC-1206-C and the early AN/ARN-5 glide
slope receivers come to mind, but the tubes used were for the most part
"standard" tube types (with more stages to make up for the loss of gain)
or types specifically designed for low plate voltages. The filaments
still pulled 300 or 150 mA currents. These sets were never really designed
for portable battery operation, but ran off the vehicle or aircraft system.

The 1 volt and 3 volt tubes had filament currents of 50 mA or so, a
lot easier on dry cell supples.

Never played with the 12V "space charge" tubes that came out for
auto radios, but I'd be willing to bet that a radio using them would
still draw way too much current to make dry battery operation practical.

Jack Antonio
KTVN
4925 Energy Way
Reno, Nevada 89502

775-858-2222
775-861-4298 (FAX) 

-----Original Message-----
From: broadcast-bounces at radiolists.net [mailto:broadcast-bounces at radiolists.net] On Behalf Of WFIFeng at aol.com
Sent: Sunday, December 04, 2005 9:03 PM
To: broadcast at radiolists.net
Subject: Re: [BC] The ultimate radio?


The thing that I am very curous about, though, is why these didn't make it 
into portable sets? Why did they use the 1 and 3v filament tubes that required a 
67 volt B+? There had to be a reason for these tubes not gaining 
popularity... was it because transistors came out too soon after these were invented?


Willie...

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