On 8/4/2020 10:21 AM, [email protected] wrote: > > Back in Nov 2017 I detailed my A15 mods: > > Set Zener current to minimum TC (I achieved < 1PPM/C at the +20V output) > This involved disconnecting the C-field circuit and replacing it with a > dual (in series ) LM299AH and 1PPM resistors. Jumperable settings and a > low TC pot for adjustment. I would have liked to use 3 LM299AH to give me > 21 Volts but would need to switch the input to the unregulated supply to > give enough overhead. The higher the voltage into the C-field string the > lower the TC contribution from the C-field coil itself. > > The posts have the details and schematic. > > Cheers, > Corby
To save the rest of you time, here are some of Corby's 5065A posts: "HP5065A C-field mods and optical unit mods" http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2017-November/090056.html http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2017-November/090067.html http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2017-November/090107.html http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2017-November/090138.html http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2017-November/090189.html http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2017-November/090255.html /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
