Karl -
Thanks for the info! Makes me wonder if the form that Drake used had a
ferrite core of some sort. I'd never had occasion to measure one, so
didn't question it. Good information for the data bank!
If you haven't already, check the power supply for the calibrator.
That's all it does. Also see if it's working at 100 kHz and the RTL
dividers are dead. Let us know!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Karl Henrik Laache wrote:
Hi all
I promised to let you know what happened to my R-4A (13-tube). I made
the pcb for the xtal oscillator that was missing (fiberglass, not
phenolic , I’m not religious), collected the parts including a 2N3904
as a replacement for the 2N3394. After some experimenting, I ended up
making the L4 on a toroid core. I tried the resistor approach, but it
wouldn’t oscillate on all bands. The toroid works fine. I removed the
L4 from a R-4B, and measured it to ca 1.3 uH on the primary winding
with my AADE meter.
Now I will do a complete adjustment, and possibly change some of the
tubes. I probably will have to change the 100kc calibrator crystal, as
it does not work at all.
So now my T-4X have a companion. Thanks for all help!
73s de Karl LA1CU
la...@nrrl.no
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