[Amps] Alpha 8410 using 4CX1500B - why?

[Carl]

And in North America the emphasis has been on both types as both have their 
uses in broadcasting and in communications where the latter mostly use grid 
driven with low power driver stages and large stage gains....unlike hams who 
are happy with 10-13dB.

For ham amps the tetrode makes little sense with its poor AB1 (closer to A) 
efficiency for acceptable IMD and having to burn most of the drive in a 
resistor. Cheap cheap Russian surplus was the only reason and then it dried 
up for the most part.

Pretty soon we will all be using whatever the Chinese give us. I cant see 
Europe doing any new development and Eimac is basically a replacement 
business.

Carl


----- Original Message ----- 
From: "Peter Voelpel" <dj7ww at t-online.de>
To: <amps at contesting.com>
Sent: Wednesday, October 29, 2014 7:50 PM
Subject: Re: [Amps] Alpha 8410 using 4CX1500B - why?


> Funny, most TV transmitters in Europe with combined sound and vision
> amplification have been with tetrodes in their final because of their high
> linearity.
> I never saw a commercial communication HF amplifier made in Europe with
> triodes and all were designed for ISB.
>
> 73
> Peter
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Carl
>
> Welcome to tetrodes Manfred. Very few are designed for very low IMD
>
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