Re: [Amps] What to do with tubeless sweep tube FL2000 ?

[Bill Fuqua <wlfuqu00@uky.edu>]

Maybe go to (4) 837's or modified 1625's. Not as much power ( they were 
really pushing the sweep tubes anyway).
Look at the LA-400 amplifier made by P&H on bama.sbc.edu. ( no www). 1200 
volts is just about right. Or you could run
tetrodes (4) 4x150A  and get more power (AB1=620w, AB2=850w) than a pair of 
G17B's and the 4x150A tubes can be gotten cheap. The sockets with out 
built-in by-pass capacitors are fairly cheap ( buy surplus T-195 modulator 
tube assemblies possibly from Fair Radio).
73
Bill wa4lav


At 10:43 PM 6/27/2004 +0300, Val wrote:
> Doubling the HV will demand  changing of many capacitors and the Pi
> net parts. But at 1200 V a pair of GI7B will put out 400 W, three -
> 600 W. The original Pi net will do the work. 6KG6/EL519/6P45S is also
> good decision.
>
> By the way, I'm  looking for an old swep tubes PA too.
>
> 73, Val LZ1VB
>
>
> > Dunno how feasible a voltage doubler and a couple of GI7B tubes
> would be.
> > The tubes are cheap and it would be an interesting project.
> >
> > 73 and good luck,
> > Alek
> > VK6APK
> >
> > >I've just gotten this nearly mint and hardly used FL2000 for a
> song. The
> > >original 6KD6's are nearly new but I would like to keep them for my
> great
> > >FT-501 with CW filter and very tired finals. Is there some type of
> > >conversion the FL2000  can undergo with another type of tube(s)? It
> would
> > >be a pity just to gut it because I stole it's tubes!  Am I barking
> up the
> > >wrong tree? Maybe I should retube the FT-501 and use the FL2000??
> > >The FL2000's  power supply gives 1200 volts dc. and I can do
> moderate
> > >circuit modifications to accomadate one or more tubes. Maybe put a
> doubler
> > >circuit in the H.V. bringing it up to 2400 v. then I could put in
> 572's or
> > >something else?
> > >Another question: Are the four original 6KD6's in the FL2000
> matched ?
> > >73's all
> > >VE2FAR
>
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