Re: [Amateur-repairs] Old test eqpt? Chuck it? Refurbish it?

Thanks Alan. If you would please send me the instructions/information on that rubber wheel design. Something like that would be excellent and exactly what I was trying to achieve. The shaft that is used to select the output frequency is to course trying to set it to the exact frequency is nearly impossible. For hypothetical example if wanting to set for 14.000.00 mhz to do an alignment on a radio I can never get it correctly set. Something like you described to change the turn ratio for lack of better terminology would be great. Thanks Craig 

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On Monday, June 30, 2025, 2:12 AM, Alan Majeski via groups.io <arcadiaresearchgroup=gmail.com@groups.io> wrote:

Hello Craig, I looked at the Eico 324 schematic and did not see any easy way to incorporate a fine tune function, however, assuming that the unit has the frequency stability to make fine tuning practical, it may be accomplished in a similar fashion to how Hewlett Packard did it on the 606B oscillator using a small shaft with a rubber wheel which engages the larger dial of the tuner. Anything else would be quite a challenge IMO.

On the question of equipment, I cannot ship units due to the lack of proper shipping boxes with high density foam. The units I have are big and heavy, example: HP 8641B, HP8510C, HP8642A, HP8565A, HP8568A etc.

I am sure that you can find units of equal value much closer to home and have the opportunity to check them out and pick them up, nothing I have is rare. I also have some parts which are no longer available from HP/Agilent/Keysight like 

"Bill West" switches, NOS and such. if you need any parts for a repair.

73

--

Alan

AK6MF