[R-390] Ballast Tube, 3TF7

[Les Locklear]

Kinda my sentiments. But I have always been a fan of eliminating the useless 
ballast tube. Unless one has to have it in place, or is connected to a 
really rotten generator that cannot produce a decent steady current, the 
3TF7 is not needed. The old stories about frequency shifting when flipping a 
light switch if you aren't using a ballast tube are just that, stories. I've 
tried most of the alternatives, guess what? They all work.

Merry Christmas to everyone and a very Happy New Year!!

Les Locklear
Gulfport, Ms.
DX'ing Since '57
http://www.hammarlund.info/

----- Original Message ----- 
From: "Roy Morgan" <roy.morgan at nist.gov>
To: "Harold Hairston" <k4hca at alltel.net>
Cc: <R-390 at mailman.qth.net>
Sent: Tuesday, December 18, 2007 10:55 AM
Subject: Re: [R-390] Ballast Tube, 3TF7


> At 10:12 PM 12/17/2007, you wrote:
>>The Ballast Tube in my R-390A just went bad. My usual source for tubes 
>>wants $30.00 for one 3TF7. Is this about the going rate? If not, I would 
>>appreciate reccomendations for an alternate supplier.
>
> Harold,
>
> Put the old tube in a little stand and put it on display. Do not buy a new 
> one.  Use a 47 ohm 10 watt resistor instead. (or whatever the right value 
> is!)  Do not make a highly engineered solid state computer controlled 
> regulator substitute module.
>
> Or: get a 12BH7, jumper a couple of the pins and plug it in.
>
> OR put 12BA6's in the PTO and oscillator sockets, jumper either the 
> ballast tube itself or the socket...
>
> Then use your radio. Spent the $30 on other spare tubes.
>
> Roy
>
>
>
>
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing
> 13033 Downey Mill Road, Lovettsville, VA 20180
> Phone 540-822-5911   Cell 301-928-7794
> Work: Voice: 301-975-3254,  Fax: 301-975-6097
> roy.morgan at nist.gov -- 
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