Reminds me of a breathless editorial I read in the NZ ham journal "Break-In"
for 1936 or there about. Predicted the imminent demise of cw due to a
technological break through : AM with modulators using zero bias triode
modulators....
73
end
Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
NEW ZEALAND
www.waiheke.co.nz/signal.htm
----- Original Message -----
From: COLIN LAMB <k7fm@teleport.com>
To: ampscontesting.com <amps@contesting.com>
Sent: Wednesday, March 27, 2002 2:00 AM
Subject: [Amps] Interesting Zero Bias Tube - the Amperex ZB120
>
>
>
>
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>
> Here are the specifications of an interesting tube - the Amperex ZB120.
ZB means zero bias. It is:
>
> "especially designed for Class B amplification. Can be used as linear
r.f. power amplifier." It has a carbon plate.
>
> What is interesting about this tube and specifications is not the power
level (only a few hundred watts), but the date of publication of the book
that lists this tube: The 1938 Radio Handbook.
>
> Here we thought we were forging down the path of discovery only to lrean
that our grandfathers already went there and did that.
>
> --- COLIN LAMB
>
> --- k7fm@teleport.com
>
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