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Yes, the driver in my description is voltage, and the current changes with voltage. Sorry for the confusion. -Chuck Harris Raymond Domp Frank wrote:

Hi there, Just going again into this problem so trying to bring back to life this thread, hoping that someone with experience on this would like to share a good mechanical tip to disassemble the

Replacement of nuvistors with JFET's (specifically, MPF102 JFETs) in the 422 scope vertical amplifiers has been accomplished by "Kurt" and was documented several years ago in his blog. I believe this

I believe the replacement is MPF102, pin for pin. less filament of course. Renée

Still have to follow up and make more measurements. Its the fuse on the 20V supply to the HV assembly. Tek calls it the HV fuse even though its in a low voltage line. Probably less than an amp

Hello, I see there is another Tektronix 547 in the Massachusetts area for those still looking. Marty.https://boston.craigslist.org/gbs/ele/6573973313.html

Regarding the tunnel diode branch from this thread - it is indeed possible to see the complete I-V curve of a tunnel diode in low frequency or DC conditions. Normal curve tracers can't do it because

Roy, I got the screw however could not get it in and in the process stripped the thread... But no big deal, just talk to old man who has "100's" of scopes and he stated that the problem is bad switch

Isn't it normal for the trace to be distorted with the beam finder? The beam finder applies a fairly hard clipping to X and Y amplifiers to keep the spot on screen. When you say there is something

Hi Hawker, The TM504A is apparently quite rare. It doesn't show up in any of the catalogs. In the 1993 catalog the TM504 is listed along with several other mainframes but by 1994 the only TMxxx

Okay yeah looks like the data collected do line up with each other and your CRT HV seems to be working at least to a point. This is F937 (2A) that you're seeing burn? I would call this the

My FG504 had suddenly died when I tried to use it yesterday (no output basically). After a lot of probing around I discovered that Q270 on the A3 Loop board had failed. It's specified as 151-0438-00,

Chuck, Didn't you mean to say "trigger current" and "triggered current"? Raymond

You seem to understand electronics pretty well... You might want to look up one of the two transistor circuits that behave like a tunnel diode, build one, and study it. It's probably better to just

Did you find info on TM504A? It could not have been produced for very long. In my "newest" 1983 Tek catalog, Tek are offering the TM500 (not A) and they had then brought out the TM5003 and

Thanks Dennis! G

Now if they only find something for those tunnel diodes. Actually they don't seem to go bad but I had scopes with tunnel diode triggering and they will just about sync to noise, seriously. I have

I plan to replace the MUX (U2530) this weekend and wonder if I can put solder mask on the guard traces between signal pins?? I would use Circuit Works CW2500 epoxy which is good to 350 C.? I cant

Tek replaced the front-end, sweep generator, and trigger generator Nuvistors (all 8393) with FETs in the 453 beginning with serial 20,000. Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg,

Thank you. Now for the 453 which arrived today. Fan Is already changed. I have the variable time pot is out, getting ready to pull the pot out of my old one.