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Hi all, I frequent a large grocery market nearby and inevitably every time I go there I get electrical shocks. I walk around with a cart and often if I touch a metal fixture (fridge, mesh rack) I get

When I wound up with the 561 from my dad's company, 30 years ago, it had a replacement filament transformer. I discovered that, in fact, the problem was a breakdown in the filament winding, not a

I'm assuming the failed FET is in a metal can, if so the failure could be tin whiskers. Several cures have been discussed in TekScopes recently. The simplest was to rap the can to mechanically

The vert front ends are 8393 Nuvistors and they are enclosed in a metal shield at the front of the scope. Hoping that will be enough, have to wait for the transformer to know for sure. ChuckA

"Other circuitry" is a risk too. The field can induce voltages in nearby wiring, so you want to stay away from the amplifier front-ends. I had trouble with this when I was modifying a 500-series Type

Yep, Gonna mount it on the opposite side of the CRT, full metal plate between them. Have a oversize temp transformer there now with no issues. ChuckA

I've got a older 155 analog voltmeter. My favorite analog bench voltmeter. 1 microvolt to 1000 volt full scale, zero center, battery powered. Unfortunately, one of the chopper fets in the input

Before you drill mounting holes, experiment with orientation in case the field gets into the CRT or other circuitry. Dave Wise ________________________________ Sent: Friday, May 3, 2024 9:30 PM To:

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