[GreenKeys] Needed: GE horizontal oscillator coil

[Jon Schlegel]

Hi Joe,

95 mH adjustable is a tall order.  One thought is scavenging an 
adjustable pot core from a WECO style TouchTone pad.  I don't know 
what their values might be but it may be worth a try.  Another 
possibility is the ubiquitous 88 mH toroid.  Add some turns over top 
of one leg to hopefully bring it to 95 mH and provide the 
tap.  Remove turns from the other leg to tune it.  Not especially 
convenient but a possibility.

I have some physically large slug tuned coils I thought might have 
worked but they measure only about 17 mH with Q in the single digits 
and without a tap.  Looks like something you'd find in the horizontal 
section of an old TV set.


Regards,
Jon Schlegel WA3MVM




At 01:48 AM 5/4/2009 -0500, amourdutigre wrote:
>Hi all,
>
>As a few on this reflector know, I am restoring a TT/l-2 TU, which I 
>consider the Cadillac of tube based TUs. It is a very complicated 
>and sophisticated piece of electronic wonder from the strictly 
>analog age of comms.
>
>In contrast, I am also considering building a rather simple AFSK 
>device based on the W2PAT TU/encoder. It used only one tube (6C5) 
>for the oscillator and a 6X5 for the full wave rectifier. The parts 
>count is low, and I will use point to point wiring with terminal tab 
>strips. Even the power transformer is easily found from Hammond, and 
>does not cost that much.
>
>However, I will not even attempt to build this unit if I cannot find 
>one part... a GE RLC-091 horizontal oscillator coil. I can not even 
>find the spec sheet for this device to attempt to wind one myself, 
>which I really do not want to do. The only thing that I know about 
>it is that it is a 95 mH coil with a tap that is closer to one end 
>than the other, and that it has an adjustable core.
>
>Any advice as to where I can find one of these, or a substitute 
>would be most appreciated.
>
>Thank you in advance!
>
>Best and 73
>
>Joe Herdler
>KB0TXC
>Greenkeys
>TCI
>/NNNN
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