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Matt, "Dumb" is not the word; "inexperienced" or "ignorant" (ie, lacking the specific knowledge) is something we all are in the beginning. Then we take it apart and we become experts! Dave (once

The TK601 should be the thermal cutout. I don't have a 503 but in my 55x and 56x scopes it is a small metal object, roughly the diameter of a quarter, usually bolted to the chassis in the area of the

Here are the measurements I took on my T620 with power off and everything still connected: Red to Blue (primary) = 3.7 Ohms Red to ground = 310 kOhms Blue to ground = 320 kOhms HV1 to ground = 202

Tom- That's a great idea. Thanks for sharing it. Phil

Interesting. ?I am going to guess there is either an overvoltage protector across the terminals of your meter, and 500V is well above the threshold. ?If it's rated for more than 500V, it shouldn't

_____i just got back in town a few days ago and picked up my tek 2232 from the post office. it works okay with a few issues, _____the first problem i notice is that when looking at lower frequencies,

Thanks a bunch Dan! I'm pretty sure it was my meter that caused the spark on the 500V, as I tried it again to make sure (that's when the fuse blew). I did stop and check the fuses in my meter but they

Howdy Ken, ? I am one of those relatively recent posters about the RM503. ?For the record, mine is still down while I work on a coil winder to wind myself a new T620 transformer coil. ? From what

You can eek a little more out of it by connecting it as an auto transformer. That will add the output signal to the input and give a bit more than 4X the FG output. Tom

Tom, David and All- Your points are all well taken and a little scrounging in the junk box yielded an audio isolation transformer of 50:500 ohm, a turns ratio of about 3.3 to 1. With the function

Hi all - I recently turned on my Tek RM503 scope after giving it a couple year break. No trace appeared. Since I hadn't used it in a while, my first thought was to get rid of it on Craigslist. I don't

Use a small power transformer to step up the output of your function generator. Most will work into the KHz range. Even better would be to use an audio transformer or you could wind a transformer

To get an idea on what the HV diodes are like, place about 10 1N4007 diodes in series. You will now try to measure the forward voltage drop of that combination. Likely it will be about seven volts or

A grateful thank you to all who took the time to read and answer my newbie questions about the 454/475 selection and the differences in the 465 and 465B.? Hopefully I will now be a little less

Thanks Stefan- I suspected the forward drop of HV diodes was quite high and I guess it can reach 40-50 volts in some cases. The challenge is to come up with a 100 volts or so somewhere close to 25KHZ.

Going back to these problems, I substituted the A5 board from my working 2465 and the readout board, and neither fixed the cursor problem. So, the problem must be on the main board somewhere.

The 4 chip version of Hakan's -11 release worked for me. I discovered that the 2764 which I ran "auto identify" on was permanently damaged and couldn't be reprogrammed. I erased the other 3 EPROMS,

I've studied my programmer software now, and I think I can take a single hex file and set which section gets burned into an EPROM. So I could have taken a single file, but I can't speak for people

The high forward voltage of high voltage diodes may have spoiled your experiment. Try with a higher voltage, ideal would always be operating voltage, safety permitting. ST

Phil: I don't think your testing method is valid.? HV diodes need a lot more voltage because Vd is much higher.? I would say at least 10 V is needed. If you have an audio amplifier handy, use your