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Again, I think I old the culprit... If you look closer to the diodes (2nd picture), there are 3 groups of 2 diodes : the middle group diodes are not connected (both !) on one side... Well... I

I've +/- 79 to +/- 119. Did not measure this before playing with R1660 pot... Well I found something interesting : at some point, this has been already repaired. Two pictures : View of th HV part

What is the Tek Part number for this transformer?

Hi I am trying to fix an tektronix 7L12 spectrum analyzer! When measuring a frquency-say 50Mhz-it is offset on screen--the zero hertz are shown clearly with same offset!. Have any off you some

Why would you have corrosion in this area unless there has been moisture or in an airborne contaminated area? Craig No CORROSION, but certainly OXIDIZATION. Wherever you have electricity flowing

We'll it seems you have researched and experimented with this issue with all due diligence. I hope you get satisfactory results soon. My core and money anxiously await your return to winding!! My

There are premade boots for coax cables. I bought some on Ebay a few years ago. I will use them to make replacement cables for my Boonton 420 and 9200 sensors. I found a whole spool of fairly soft

Hi Sean, In the PG502, all leads of that IC are the same length, I believe (I will check this eventually). That might explain what you saw -- the previous user apparently tried to add back the lost

That's a good point. At any rate, I got these instruments for free, so I'm not complaining too much, especially if I can resurrect this 7904. :o) I took the working output IC (with the bodges) and

Hi Sean, With instruments of uncertain provenance, it's hard to say what a previous owner might have been thinking (or failing to think), so anything's possible. It's hard for me to understand why

Tom, I wonder if that's where this one came from, the one with the bodged leads. Since I'm guessing in the pulse generator application, it's not driving a crt? Sean

If you can find a junker PG502, that's another potential source of that vertical amplifier. --Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA

First off, I don't do videos. Sorry. I believe the real issue is that the centering is way the heck off, possibly due to bad (or damaged) ICs on both vertical amplifiers I have. The gain problem is

Yeah, it will need a full cal regardless...I changed out the CRT from the 7903 parts unit I have. I do have good quality non-inductive resistors on hand. Since I have two identical vertical

Thanks for the information Miguel, but I bought a TM503 with a TR503 and a DC503A plug-in from Germany. It hasn't arrived yet, when I get it I change the crystal and retune the cavity

Siggi, indeed this unit has OPT 6,9, CTT, WR and GPIB so both CTT/WR board and GPIB are installed. As I received the score with PSU dead and removed with all cables loose, I used the Option service

Hey Jon, I don't suppose the scope had any options installed that have been removed? After I repaired my 2467 I had a persistent TEST 05 failure. In my case this was because the options board was out

Hi Joel, Indeed, there are lots of things you can do when you are spooling thread, twine, or string. First, the thread has a twist to it, which makes it naturally want to lay with the help of the

Thanks, I'll take a look. Harvey

Hi, thanks for the warm welcome! I really admire the 500 series scopes as I think folks have taken pride in every step of designing and manufacturing those instruments, and that's more than