Franco -
The two bulbs are in series across the 12V filament supply, so if either
opens up, they both go out! So one just burned out!
The originals are indeed #47 bulbs, and are available from just about
any of the usual electronic parts supplier. They are/were the
"standard" bulb in just about every piece of electronic equipment that
had bulbs! :-) If you can find them, I would suggest that you replace
both bulbs with #755 types. The #47 is a "3000 hour life" bulb, while
the #755 is a "20,000 hour life" bulb, meaning that you most likely will
never have to replace them again.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
iz oos wrote:
Hi folks,
both the bulbs at the plate amps rel. output and at the dial stopped
working as I turned up the T-4XB. I turned it on after about 1 minute
I had turned it off and then the lamps stopped working, I don't know
if this could be related to the burning of the lamp, but it happened.
Where could I find the right replacement for these bulbs? Looking at
the schematic they look like to be ## 47 ## 47 (I am not sure about
that) am I correct? What could have been the cause?
My T-4XB is so dark now!!!!
73,
Franco IZ2OOS
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