[R-390] Ballast Tube, 3TF7

[rbethman]

Harold,

I'll second Roy's suggestion!

I've had one R-390A that I git with a 50 ohm 10W resistor in place of 
the ballast tube - ran it 24/7 for three or four years.

Never waivered or hiccuped!

You do NOT need a 3TF7!

Bob - N0DGN

Roy Morgan wrote:
> 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 -- 
> _____________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:R-390 at mailman.qth.net
> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>