[SixClub] 6M Amp Conversions & Tube Selection?

[doc at kd4e.com]

This is where I read about the 4-1000 6M amp.

It was apparently published in 73 Magazine in the mid-80's

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http://forums.qrz.com/archive/index.php/t-50099.html

The "Blockbuster for 50 MHz" amp with the 4-1000 is one I still use on 
six meters, after 20 years. It provides about a kilowatt output with 10W 
PEP drive power (not a typo, really 10 Watts), because it's not grounded 
grid, it's grid-driven. That was intended to be a high gain amplifier 
because at the time I had a low-powered exciter and didn't want to build 
an intermediate power amplifier.

Of course, its power supply weighs 140 lbs, but that's another issue.

WB2WIK/6
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> 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
>
>>
>> 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
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