[R-390] R-390A tuning question.

[Philip B Atchley]

Hello all.  
After using the R-390A for a couple weeks to "chase beacons" I have
noticed a tuning peculiarity that I'm wondering is 'normal' for the set. 


First, let me explain what I'm doing.  I'm chasing beacons in the
200-525kHz longwave range.  I use extremely narrow filters with both the
.1KC Xtal filter and Sharp audio selected, BFO offset about 800 Hz. 
Naturally this requires extremely slow and patient tuning to prevent
overrunning a weak beacon.

The KC tuning on my receiver is very 'free', probably the best R-390A
I've had in that regard.  BUT, I've noticed that when tuning "up" in
frequency the tuning is easier than when I tune "down".  Almost like
tuning up in frequency is "power assisted".  Common sense would tell me
that, if anything,  it should be the other way around as the slug racks
for the most part are going down as you tune down in frequency.

Has anyone else ever noticed this anomaly?  Cause?  Cure?

73 de Phil  KO6BB
Loving home provided for wayward Boatanchor Receivers.
R-390A '67 EAC.  HALLICRAFTERS SX-71 ('53) & 5R10A ('53).
REALISTIC  DX-160 ('78).  HOMEBREW  Longwave CW receiver.
Merced, Central California, 37.18N  120.29W  CM97sh.

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