Re: The First and Last Hallicrafters with Flywheel tuning?
¿ªÔÆÌåÓýSince a ?day ?ago [this is a late reply] we deviated to non-Hallicrafters also, my old heathkit AR-3 had ?some kind of viscous damping tuning for each of the main and BS caps. It is hard to believe how a slight torque will allow the Cap to turn very slowly. Just don¡¯t lean down on the knob. It can¡¯t be a simple planetary gear reduction; perhaps it is a Jackson ball drive? which seems to be classed as one form of vernier drive. But I always wondered what is in there ????? .. I missed my education somewhere! ? From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow via groups.io
Sent: Sunday, April 27, 2025 7:55 PM To: [email protected] Subject: Re: [HallicraftersRadios] The First and Last Hallicrafters with Flywheel tuning? ? There ete all sorts of variations of dial drives. For instance rhe Hammarlund SP 600 JX uses a gear reduction driven by a friction drive on the dial, it also has a flywheel. While it has both a main dial and band spread dial they are driven together. It is an extremely smooth drive.? In comparison, thr RCA AR 88 also has two dials which are driven together via gears but the main shaft is gear coupled to the dial mechanism, no friction drive. It also has a flywheel.? This is also a very smooth drive although the SP 600 is smoother.? ? ?
-- don??? va3drl |
don Root