[AMPS] 3 x 3-500Z

[km1h @ juno.com]

On Thu, 25 Sep 1997 19:29:17 +0200 (MET DST) Johnny Johansen
<johnnyj@stud.ntnu.no> writes:
>
>Hello all,
>
>I was wondering if anyone have some experience with three 3-500Z in
>parallel??

The Amp Supply LK-550 used 3 tubes. With a bit of rework it is a fairly
decent amp.


>Anything particular to be worried about?
>
>Have built an amp with two such tubes -  grounded grid construction -
>previously, without any problems at all....easy and reliable, but what
>about adding one tube??..anyone?

The primary concerns are getting enough air flow and a sufficiently low
minimum C from the tune capacitor. A spit section air cap or a vacuum
variable would do the job.

The CB crowd run 4, 6 and even more 3-500Z's on 27MHz !!!!!

For full output you will need 65-75 W of drive per tube so then the only
full power exciter would be the FT-1000.

73   Carl   KM1H 

>TIA
>
>73 de Johnny - LA5IIA
>
>
>    
>   
>
>
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