[Hallicrafters] HT-44 Finals

[Langston, Mike]

Hello everyone, I have completed clean-up and recap of an HT-44 and
matching P.S. to go with my SX-117. Started to check alignment last
night and the first step is to set the bias adjustment on the P.S. for
100ma idling current on the finals. I did this with no problem. The next
step was to check the finals to see if they are "matched". I have spare
NOS tubes but the existing tubes in the rig tested ok so I started with
them. The procedure says to pull one final tube and adjust idling
current to 50 ma, then pull that tube and put the other final in its
place. If the idling current falls between 40 and 60 ma., the tubes can
be considered "matched". The problem with this is the 6v final heaters
are wired in series and fed with 12v. In fact all the 6v tubes in this
rig are wired the same way and fed with 12v. Naturally, when I pull one
of the finals, the heater in the remaining one gets no juice and I can't
jumper it to ground because then it will get 12v. I can't understand why
the manual would provide a detailed procedure for "matching" final tubes
that obviously won't work. Am I missing something? Anyone else run into
this before?

 

Thanks,

Mike Langston KL7CD

Dallas-Ft. Worth

972-392-5336