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I have a 179 bench DMM also. I usually leave it running because I'm always using it to check this and that. I also have a 147 Nanovolt Null Detector. After I capacitor-discharge welded all the crimp

I have some Keithley too: some 7001 fresh refurbished by me and waiting for any hand-made board :) And Keithley 230 (not sure regarding working). I switched it on about a 15 years ago. Peter сб, 4

I've got a Keithley 2015THD DMM, and I also have a basic Keithley 2000 DMM. I've also got one of the Keithley 2200 programmable power supplies plus another 2200 that needs to be repaired. I usually

Thanks, I saw those but unfortunately I have a 575 which doesn’t have the step gen output banana plugs on it like the 576/577/370. I do have an eico 667 kicking around that I don’t use anymore

I have some extra's PCBs that I designed and had made. They are based upon Dennis' (and ChuckA's) design. You can see pictures of the finished unit here: /g/TekScopes/album?id=291888.

I have a 179 as my shop DMM. It is the only instrument I own which goes to the cal lab. -- Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA https://plymouthcolony.net/starcity/radios/

On Sat, 4 May 2024, Ilya Tsemenko wrote: It's interesting -- I also have 263 waiting in queue for refurbishment and calibration as well as several 237 and 238 SMUs and couple of 6517A units :) Almost

<+1> I love Keithley's and repaired quite a bit of them, mostly DC/LF stuff. Actually have 263 on bench too for some repairs. :) BR, Illya

Also I am considering trades for in person meets. I will also ship. PM me for that.

I have an SC502 that I want to sell. I see an SC503 going for $500 on ebay, but as we all know, ebay really likes to inflate prices. I don't see many of these SC502s being sold so I'm not sure of a

<Raises hand> I do. I am working on a 263 at the moment. The best source for discussion I have found is the EEVBlog forum. Shaun M

To finish this thread the problem ended up being leakage from the CRT filament winding in the LV transformer. Seems I didn't "hear" Alberts description of the problem until I got an email from Ferrous

Mark, Check the four zeners on the trigger board. I found mine to be open. I used BZX85B9V1. The low value tantalums were high ESR. They were replaced with film types. Mine did not trigger unless a

All my TM (usually) works very well. My ongoing projects are vintage Keithley. I have not found a Keithley forum. Do many here delve into the brown boxes? Jeff

Hi, Does anyone know if there is a way to get the PCB that Dennis Tillman used to provide for the Tek 575 Vacuum Tube Curve Tracer adapter referenced here - the one where you mod something like an

I acquired a 7904A a week ago was working very well, but yesterday the B horizontal time base (7B92A) wouldn’t trigger at all, it works perfectly in the A slot. Any suggestion on where to start

I bought a[nother] 7704A that is dirty but shows promise as it's a later S/N and has Option 9. It had blown fuses and I traced the main 4A fuse to a shorted bridge rectifier. After finding a temporary

Thanks for the reply, Edward. The reference out is exactly -20 dBm at 100 MHz, so that's not it. At this point I doubt I'll pursue it much further, as I am using the ADALM Pluto/SATSAGEN combo to get

Albert: From my first post: "But it appears the HV transformer T620 (pn# 120-199) is bad, all the voltages out of it gradually drop after running for a couple of minutes. The +500v supply voltage is

Chuck, Sorry, please forget the first line in my last post! It seems I have to read everything twice or more times to make no mistakes like reading HV where LV is written. Albert