[Hallicrafters] HT-44 Finals

[Sandy W5TVW]

What you need is a "dud" tube with a working heater.  Clip all the pins off except 2
and 7 (heater).  6DQ6 as I recall?

73,
Sandy W5TVW
----- Original Message ----- 
From: "Langston, Mike" <MLangston at HCPRICECO.com>
To: <hallicrafters at mailman.qth.net>
Sent: Thursday, August 26, 2004 10:32 AM
Subject: [Hallicrafters] HT-44 Finals


| 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
|
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