[Hammarlund] SP-600 Capacitor C97

[Phil Atchley]

Hi.
I'm doing a "preliminary" alignment on the SP-600.  Gain seemed a little low
on bands above 7MHz (2nd mixer).  I checked the 3.5MHz Oscillator, frequency
is only about 20Hz high as measured on the Yaesu VR-5000 receiver (in LSB
mode), so the Xtal is good!

Anyway, I found I had to tune the slug of L33 nearly all the way in to get
any semblance of normal gain (L34 is "normal").  This indicates to me that
capacitor C-97 is either open or changed value (decreased).  IS THIS A
COMMON FAILURE IN THESE SETS?

Another Question?  Schematic shows C97 as 65pF.  IS THAT RIGHT?  Before
cutting this one out I want to make sure I have a replacement (not easy to
get in there without removing the Xformer).  If it is I have some 1000VDC
Silver Mica 68pF 5% capacitors that should work just fine.

So far I'm very pleased with how this set is coming along.  I had to stop to
do some home repairs (air conditioning) but the set is progressing quicker
than I'd hoped.

73 de Phil, KO6BB
DX begins at the noise floor!
k06bb@elite.net
Merced, California
37.18N  120.29W  CM97sh




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