Uh-oh... Is this a pattern?? :-)
Are certain that this arrangement is "original" and not a 'fix' applied
later?
Interesting photo, if original, perhaps Drake wasn't completely happy
with Sprague 80P3s after all! These look much more robust. Are there
any markings on the white feedthroughs?
They look almost like ceramic feedthroughs, i.e., just a bolt with
insulation around it, in which case Drake came to the same conclusion I did.
Is the 'blown' one one of the tan disc caps on either side?
Yes, the function is to keep the RF Drive signal inside the input
shielded area of the amp. The caps work against the inductance of the
filament choke, L2.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
ROBERT SMITH wrote:
Hope I'm not getting into trouble posting this again. I have a late
model L4B amp- serial number 6122. I'm new to this Drake and vintage
gear so please bear with me. I blew a Ceramic Disc capacitor on the
L4B C -26, Stamp .1 Z5V+80 -20. This goes to the RFC 2 then
to one of the 3-500Z filament. It has to have high amperage thru it
I would image, plus what voltage? Tube info says 5 volts on the filament.
So what I would like to know where I could fine a replacement for the
blown one and a couple extras. Part number ect. I have enclosed
a picture of the blown cap. I think this is used for keeping RF away
from croke and filament??
Thanks
Bob w0vu
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