?

I am looking at a schematic from Riders, probably from BAMA. It
shows Pin 6 of the 12SK7 to be the screen grid, going to a line also
connected to the a 0.25mfd cap on the B+ going to T-4 and the screen of
the 35L6 output tube. There is a 0.25 mfd cap connected to ground to
by-pass this line but in this schematic its shown at the B+ side of T-4.
Same line. Its called C-17. This line goes to the B+ filter. Its
bypassed by one of the filter caps but that may not be effective at RF
so this additional cap is included. See if there is also a bypass at the
B+ input to T-4. It may have been moved or there may have been caps in
both locations if it was found better bypassing was needed. There were
evidently lots of changes to the S-38. From the circuit I would keep a
cap there, replacing it with a new cap of course.
Even though the B+ goes to a filter cap there may be pick up in the
wiring or the filter cap may not give good bypassing at RF.

On 1/11/2025 6:08 AM, W4LSV Barry via groups.io wrote:

I am in the process of recapping a S-38 that was given to me. ? I have
not powered it up. ?It still has all the paper capacitors and non
polarized AC Plug. ?It has 6 tubes and a BFO. ? It does not have the
C-38 and C-39 silver micas that, according to my schematic, were added
to later models of S-38.
I have found an extra 0.2 @200 V paper capacitor connected between Pin 6
of 12SK7 tube and ground. ?Its condition is similar to all the other
paper capacitors that I am replacing. ?As far as the physical location,
one lead is connected to the same ground lug that C-36 uses.

Should I replace it or not?

I would greatly appreciate any insights and suggestions, as my
experience with vintage radios is minimal
73,
Barry W4LSV

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998 ?