Tom -
Every schematic I have for the RV-4 and RV-4C all show the #53 bulb. So
it's probably a mod done by someone who wanted to standardize on 6V
bulbs!. It's possible that Drake did it for the same reason, but if so
it's the only one I've ever heard of.
Sp unless someone else pipes up with a similar unit, I'd say it was an
owner mod.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
Tom Delano wrote:
Hello Drake Aficionados,
I recently purchased a late serial number Drake RV-4C and when I connected
it to a TR-4 I noticed the dial lamp wasn't very bright. On further checking
I found that the bulb was a #53 as called for in the schematic, but there
is a 1 watt dropping resistor in series with the 12v AC line that is
reducing the 12V to 6V.
My question then...was this a production change made by Drake or was it a
modification made by a previous owner?
Thanks for in insights you can provide.
73,
Tom, W1CC
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