Really good pix on the inside of the 3500V module. So the opening of the can is the typical lots of heat and pry it open approach right? How about a good pix of the 2500 Volt module? Thanks Paul WB8TSL
On Sun, Mar 26, 2017 at 6:42 PM, Donald E. Pauly <trojancow...@gmail.com> wrote: > https://www.febo.com/pipermail/time-nuts/2017-March/104374.html > > We continue to try to achieve lock on our latest HP5061B acquisition. > We found that the -2,500 supply would only come up to -780 V under > normal 55 Meg multiplier load. When we pulled off the HV lead to the > beam tube, it came up to only about -1,500V. After another horrible > desoldering job, Q2 collector waveforms were essentially normal. We > found a near open C1 which is 47 μFd at 35 Volt electrolytic was open. > This caused massive spikes on the bypassed +18.7 line. We replaced it > with a tantalum. This brought it up to normal -2,700 V for full > clockwise beam adjust on R7. > > Next we found that the +3,500 supply was only up to 1,000 V with > normal ion current load. We expect to find the same problem on this > supply. See http://gonascent.com/papers/hp/3500top.jpg. C1 cannot be > seen in this photo. Ion current was only 15 μA because of the low > supply voltage. I will have another post on what we found about > electron multiplier voltages. > > DEP > > πθ°μΩω±√·Γλ > WB0KVV > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
