[R-390] Ballast Tube Thread/Deadest horse that's ever been beat

[Jerry Kincade]

Has anybody ever investigated the possibility of switching the 3TF7 out with
a triode-pentode that could do double duty as a ballast and a transmitter?
Seems like an R-390A/URT Transceiver could be a possiblilty. Heck, you
already have a T/R relay built in, all the power supplies you need, and
crystal oscillators. Probably too much to ask for plate modulation, but for
CW it might be a great rig, if a bit on the overdesigned side on the
receiver part.
Jerry W5KP

----- Original Message ----- 
From: <Llgpt at aol.com>
To: <rbethman at comcast.net>; <r-390 at mailman.qth.net>
Sent: Sunday, July 04, 2004 12:22 PM
Subject: Re: [R-390] Ballast Tube Thread/Deadest horse that's ever been beat


> Hmmmmmmmmm,
>
> Everything was sailing merrily along until now. We need to get the Mars
> lander Project people in on this to tell us just how far out of spec that
50 ohm
> resistor can climb before you can no longer hear a signal. 51 ohms, in a
few
> decades it might be 53-54 ohms. Egads!! I should have listened when I was
called
> a witch for using sand state devices to replace a tube............live and
> learn I guess.
>
> Les Locklear
> Monitoring from The Gulf of Mexico
> Hammarlund HQ-120X
> Harris RF-505A (R-5075/GRR)
> R-390/URR
> Ten Tec RX-350D
> Alpha Delta Sloper
> Various Longwires
> Monitoring since '57
>
>
>
>
> In a message dated 7/4/2004 10:19:23 AM Central Daylight Time,
> rbethman at comcast.net writes:
> Barry & Les,
>
>      I'll play whatever role you wish pursuant in keeping this alive!
>
>      I don't get "sucked" into anything!  I JUMP in with my eyes open
wide.
>
>      To make sure it is "on-topic", My 50 ohm has after about 8 or so
> years of use in lieu of the INFAMOUS 3TF7, has drifted to 51 ohms in
value.
>
>      Happy Fourth!  My spirit is with the new ones doing what us OLD ones
> used to!
>
> Bob - N0DGN - USA/USN retired
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