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  
 At 05:27 AM 26/06/2004, donii@sympatico.ca wrote:
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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