SR-150 VFO Lubrication
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Do not use oil. Clean the drive system first. Where you have two gears meshing, use a toothpick and put a small amount of white grease at three points around the smaller of the gears. Then turn from stop to stop several times and let the gears spread the
lub.?
As for the stiffness, some stiffness is desirable. This is to prevent mechanical drift or backlash when you release the tuning knob. Originally there was a felt disc between the tuning knob and the front panel. If your radio still has one check to see if
the knob set screws were tightened with the knob pushed in too tight.
Walt Cates, WD0GOF
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From: [email protected] <[email protected]> on behalf of Steve N7AQ <smoreen@...>
Sent: Tuesday, April 29, 2025 10:56 AM To: [email protected] <[email protected]> Subject: [HallicraftersRadios] SR-150 VFO Lubrication ?
I recently purchased a SR-150 in good condition and have been working through WD0GOF's wonderful guide in repair and restoration.? On page 92 there are notations on the lubrication of the VFO and Chassis Assemblies.? From
the perspective of someone with limited experience in cleaning and lubricating a VFO assembly, are there practical suggestions on how to service the VFO assembly and what kind of grease to use.? (Obviously 3 in 1 oil is easy to obtain.)
The assembly is working but unevenly stiff.? In my restoration efforts I want to make sure I do no harm to the assembly.
Thank you for any guidance.
Steve N7AQ
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waltcates