[R-390] Anyone have a spare ballast tube?

[Barry]

Or just sub appropriate resistors in the existing socket.  That's how I ran mine most of the time.  Residential power is relatively stable and, unless extreme stability is that critical for, maybe, digital modes, etc., it works just fine.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Jacques Fortin" <jacques.f at videotron.ca>
> To: n4buq at knology.net
> Cc: "Larry H" <larry41gm at gmail.com>, "Collins R-390 HF Receiver List" <r-390 at mailman.qth.net>
> Sent: Saturday, November 28, 2020 11:09:12 AM
> Subject: Re: [R-390] Anyone have a spare ballast tube?
> 
> Hi Paul,
> 
> Fair Radio still have NOS 3TF7 ballast tubes in stock.
> Or if you can find a 2HTF11B, it will be good also (this is the original
> type used in the R-390s).
> If the price asked is too much, just strap pins 2 and 4, then pins 5 and 7
> of the 3TF7 socket and use either a 12BY7 or a 12BH7 in there.
> No need to be a "good" tube, as far as the filaments are still good...
> 
> 73, Jacques, VE2JFE
> 
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