Kev,
Those are the trimmer caps that are currently used. Yes, they are not
ceramic, but they have good temperature compensation characteristics
(better than the original ceramics).
Observe the flat side orientation when installing those capacitors so
they can be properly adjusted when using a metallic adjustment tool. If
you cannot discern the flat side on the silkscreen, look at the parts
placement diagram in the back of the manual.
It is not essential that they be set to midpoint, you will be able to
easily determine the proper tuning point when you come to the alignment
procedure.
73,
Don W3FPR
On 10/26/2014 2:56 AM, Kevin Schache wrote:
The four trimmers provided for C32, C34, C44, and C46 are supposed to
be 5-30pF ceramics but the ones supplied appear to be quite different.
They have a brown plastic type body and don't appear to be ceramic. I
can find no markings on the trimmers to indicate their capacitance.
The inside adjustment screw head is + shaped rather than a single slot
for use with a small flat blade screwdriver. All this makes it
difficult to set these trimmers to the mid-point as specified in the
manual page 68 Figure 6-23.
So I decide to find their midpoint by measuring them before inserting
them, but came up with 20 -70pF which is a lot different from the
expected 5-30pF.
I don't think my capacitance meter would be that far out.
The other two 50pF trimmers, C21 and C23 are certainly ceramic.
I've checked various assembly photos and they all appear to clearly
show ceramic trimmers.
Can anyone tell me if these are a correct replacement?
Should I proceed to find the measured midpoint of these on the basis
that they are a correct replacement?
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