[R-390] Questions about R103 (RF gain) and about R104 and 105.

[David Wise]

I seem to recall that you can turn a linear into an approximation of log or reverse log by adding a fixed resistor from slider to one end.  There is discussion on the web somewhere.

FWIW,
Dave Wise
________________________________________
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of Jacques Fortin <jacques.f at videotron.ca>
Sent: Wednesday, September 02, 2020 8:17 AM
To: David Wise
Cc: Collins R-390 HF Receiver List
Subject: [R-390] Questions about R103 (RF gain) and about R104 and 105.

Hi to all,

I began restoring a newly-acquired EAC R-390A.
Sadly, this unit have been severely "modified" by unknown people and the RF
gain and AF gain controls are not either original or of the right value.
I believe that R103 have to be a 5K, 2W, reverse-log taper is it right ?
For the R104 and 105, they have to be 2.5K, 2W, log taper ??
Where I can find some (if not the original ones) ?
The only ones I was able to find are linear-taper...

73, Jacques, VE2JFE

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