[Amps] HF and 4cx250b's

[R.Measures]

On Jul 15, 2004, at 7:53 AM, Dino Darling wrote:

> I was told, by a wise person, that if you need more than TWO tubes to 
> get the desired output, GET BIGGER TUBES!

••  It's good advice.  Each time, one adds a tube, it increases 
feedback-C, which is not a good thing unless one is designing a VHF 
oscillator.   For example, one 3-500Z amplifiers seemingly toast fewer 
bandswitches due to intermittent arcing than two 3-500Z amplifiers.  
Another factor is cost.  For example, two 8877s cost more than one 
8171, and they will deliver only about 1/3 the output of an 8171 .  
However, the socket for an 8171 costs more.
- cheers, Dino

>  I too have been curiuos whay there is a lack of 4CX250Bs in the 
> Amateur market.
>
> At 06:22 PM 07/14/2004 +1200, you wrote:
>> Hi all,
>> Is there some reason why there seems to be very few HF amps built 
>> around the 4cx250b's? They seem to be cheep and very plentiful.
>> I am thinking of building an HF amp using 3 or 4 4cx250b's. Is there
>> anything wrong with doing this?
>>
>> Cheers
>> Jerry
>
> Dino...k6rix at earthlink.net
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org