[Hallicrafters] Final Tubes for an early HT-4:

[Steven Grant W4IIV]

the RK-63 was replaced by the 250th and can be used with no mods according to my data    steven W4IIV


Yardleyite at aol.com wrote:
Greetings all members,
To my knowledge the earliest HT-4's used a 
Raytheon RK-63 triode as the final tube. Not the 250TH's of a later vintage. 
THe 250TH has a 50 watt greater plate dissipation.

Would anyone happen to have a pair of RK-63's (new or used) for sale/swap? 
Unfortunately I don't have an early HT-4. What I do have is a very pristine 
homebrew high power fone transmitter from 1938 that could use a pair. It currently 
has the original ones and I'm looking for spares. The RK-63's are modulated 
by a pair of 838's in PP.

Any help will be appreciated. Thanks for the bandwidth.

Mod-U-Later,

Joe Cro N3IBX



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STEVEN GRANT    W4IIV


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