[R-390] Re: [R-390] RE: [R-390] My 'new' '67 EAC is now
"on line" 8^) Ballast Tube question.
Barry Hauser
[email protected]
Thu, 17 Jul 2003 09:56:08 -0400
Hi Phil, Ed & List
The last time it came up, I recall that word was that the 3TF4 was not a
good sub -- resistance is something like double or triple that of the 3TF7
and would not be long-lasting. However, in some contacts here and there I
came across someone who has used them and says "no problem".
What about this?:
What if you put a resistor in parallel with a 3TF4 of the right value to get
the filament voltage up a notch and take some of the current off the ballast
tube to reduce glow and increase life?
Would there still be some ballast action with the combination? Might be a
bit tricky to install alongside the tube. The resistor probably should not
be inside the module chassis.
Any thoughts on this?
Barry
Hi Ed.
Bingo! You hit the nail on the head. I just took the screws out of the
front panel (again) and took a peek at the Ballast tube. IT IS a 3TF4! I
didn't even think about the possibility that it had the wrong tube in it. I
rechecked the Voltage across the output of the ballast, going to the BFO and
VFO and see 11.5 Volts tonight (think I had just over 12 when I checked
before).
Well, since it's what's in there and it isn't applying too much Voltage to
the tubes I think that I'll just run it till it quits 8^)
73 de Phil, KO6BB
DX begins at the noise floor!
[email protected]
Merced, California
37.18N 120.29W CM97sh
-----Original Message-----
Check that you've got the right ballast in there also. I experimented with
a 3TF4 when I didn't have a 3TF7. It functioned, but it lit up all over- I
expect it would not have lasted too long.
Ed
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