[SixClub] 6M Amp Conversions & Tube Selection?

[Chris Boone]

I don't think the 4-1000 would be a good tube on 50MHz...I thought their cut
off was just above 10m.....

The 3-500Zs are ok....they are used in the SB220 conversions.....but they
run hot since they are close to their limit as well..personally, I would
take something rated in the FM broadcast band and redo it for 6....The 8874,
4CX250s, etc metal/ceramic tubes are best for VHF use....a solid state model
may be easier/cheaper (at least at the 400w level)

The 572Bs can be made to run on six but the internal construction makes them
squirrely.....

Chris
WB5ITT

> -----Original Message-----
> From: sixclub-bounces at mailman.qth.net [mailto:sixclub-
> bounces at mailman.qth.net] On Behalf Of doc at kd4e.com
> Sent: Saturday, October 09, 2010 1:53 PM
> To: World Wide Six Meter Club
> Subject: [SixClub] 6M Amp Conversions & Tube Selection?
> 
> A friend is looking into the conversion of an amp for 6M.  He'd
> prefer *at least* 400W PEP Output.
> 
>  From what I have read the GI-6b and GI-7b are excellent choices,
> the 3-500z is a solid choice, and the 4-1000 a terrific choice.
> 
> Tubes to avoid are the 811a, 572b, and sweep tubes.
> 
> WDYT?
> 
> --
> 
> Thanks! & 73, doc, KD4E