[Amps] TV sweep tubes and 6146s

[Karl-Arne Markström]

Without grossly abusing the 6146's, you cannot expect more than
about 250 W PEP output from four 6146 tubes.

The reason that sweep tubes can give more power is that
they have very large peak emission capabilities.

Peak emission in a 6146 is in the order of  700 mA, but i.a. the 6LQ6
was rated for about 1,2 A peak emission.

To get 400W PEP, using a reasonable plate voltage, 
out of parallelled small glass transmitting tubes would require 4 or 6 of the TT21 class tetrodes 
(as frequently done in small ship's radio equipment during the 70's).

If you try this concept, it would be preferred to run the 6146's at a higher plate voltage
rather to stretch the cathode current ratings.

73/

Karl-Arne
SM0AOM




----- Original Message ----- 
From: "Tom Bowman" <wa3rey at comcast.net>
To: <amps at contesting.com>
Sent: Wednesday, August 10, 2005 12:54 PM
Subject: [Amps] TV sweep tubes and 6146s


> What is the reason amplifiers never seem to be designed using  four 
> 6146s instead of TV sweep tubes like for example, four 6KD6s?
> I must be missing something obvious here.
> 
> I'm asking because I'm thinking of building a 400W or so PEP amplifier 
> for 75 and 40 meters.
> 
> Keeping cost really low is one of my goals here and I have several good 
> 6146s in the junk box.
> 
> 
> 73,
> 
> Tom, WA3REY
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> 
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