Re: [time-nuts] HP 5065 Rb update

Hi What we are dealing with here is a transistor circuit that does indeed need the low value pot. It also needs to beL *very* stable. Lots of details on just how stable at: HP5065A Bob > On Dec 5, 2020, at 4:37 PM, ed breya wrote: > > Paul, if the pot

Re: [time-nuts] HP 5065 Rb update

Paul, if the pot is 1 k, set up as a DC divider from a low-Z reference voltage, and only lightly loaded by an amplifier circuit, you could try upping it to a 2 k or 5 k, possibly 10 k, and get an immediate resolution/set-ability boost, with little effect on the rest, and no other part changes

Re: [time-nuts] HP 5065 Rb update

Hi Crazy as it seems, running at a higher C Field current makes the device more sensitive to stray mag field. If you want to “soup up” your 5065, you would adjust the synthesizer for minimum (but still in range) C Field current. Why not go to zero ( or real close to it) ? There are multiple

Re: [time-nuts] HP 5065 Rb update

Hello to the group. Did switch the leads and no major effect. I also did provide a separate power supply and am controlling the cfield with that. It appears that by going to 7 ma the system is stable on the original tube marking of 8714 on the thumbwheel. The original cfield range went up to 6.6

Re: [time-nuts] HP 5065 Rb update

If the only problem is that you're at the resolution limit of the pot, you may be able to slightly modify the circuit, reducing the pot's effect, but also reducing the total adjustment range. I don't recall what the circuit looks like, but from the discussion I'm guessing it's like a 10 kilohm

Re: [time-nuts] HP 5065 Rb update

paul swed writes: > Bob by the way did move the unit around no effect. That only shows if the surroundings contribute with a magnetic field, it does not tell you if the mu-metal shield around the physics package has been magnetized. I would still try to change the polarity of the

Re: [time-nuts] Broken 5370B

Jim, contact me off-line to see if we can find a cheaper shipping method -- that quote is based on USPS priority mail which so etimes is, so erodes isn't, the best choice. John On Dec 5, 2020, 4:09 AM, at 4:09 AM, Jim Palfreyman wrote: >So I have a 5370B with a stuffed channel. > >What should

[time-nuts] Broken 5370B

So I have a 5370B with a stuffed channel. What should I do with the unit? Jim P.S. I'm in Australia. P.P.S. As a replacement I'm eyeballing the TAPR/TICC option but AUD$54 in postage. Ouch! ___ time-nuts mailing list -- time-nuts@lists.febo.com To