[Amps] 2x813 or 2x3-500zg ?

[Roger]

My personal opinions:

The 813 is a nice tube and I have built amps using them.
However the 3-500Z is a current tube, in production, and not outlandishly 
priced.
As far as as a matched pair, I've never worried about that with 3-500s 
unless they are way off and I've not found any that were.  The 3-500s are 
not a higain tube, but if you have an honest 100 watts and enough plate 
voltage they'll run the legal limit.

Roger (K8RI)




> Hello to everybody! Happy New Year 2008!
> In the coming year I would like to build an amplifier for "everyday
> use". For the contesting I already made the amplifier with GU-84B and
> GM3SEK's tetrode  boards and it work fantastic! The second amp I would
> like to make with glass tubes. What you guys can recommend me? I was
> thinking about two 813 in grounded grid configurations but now I'm
> thinking why not the pair of 3-500zg from RF-parts? I newer used 3-500zg
> before so I can't compare it to 813. I understand the difference in
> pricing but I also know it's easy to buy matched set of 3-500zg but
> it's just impossible to find matched pair of 813.
>
> Regards, Mike RL3BM
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