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I'm curious about your analog computer. Are you documenting/blogging/video'ing this anywhere? What is the goal? I'm also working on circuits to drive X-Y displays, but at a very basic level since I'm

It is made on laser engraver. I have a friend that work on this machine and I make a corel with outlines and what need to be on scale. it is made from black PVC foil past on Plexiglass. First cut the

I have been refurbishing some late 70s-early 80s HP gear and I only replace bad capacitors per ESR or Q meter readings. A schematic helps in making sure there are no other elements in parallel that

The LO input to the mixer is also dead. It comes into the mixer through a cable/plug and it's still dead while unplugged. There are several test points on the LO circuit . The manual has a few

Sounds good. I terminated it with 600 ohms and now it's perfect. Thanks for pointing me in the right direction. Rick

Dennis' suggestion of using add and invert mode on the oscilloscope works well depending on how much sensitivity you need. If you have a 7000 mainframe, then a 7A13 combined with standard x1 probes

Dave, Thanks, yes a couple of them sold that would be just fine. Repair project is OK. I'm standing by and eventually I'll be providing one a new home and tlc. Either private party, hamfest, or the

To second Dennis, this is exactly what we do, and we’re a professional audio archive lab. George

Massdrop had one a week ago for $140. I was actually quite surprised to see such a specialized piece of equipment show up for sale there. If it's not available now, be patient, it'll come up again.

Dave- You might consider going to ham radio swap meets. A really great FET differential probe is the Tek P6046. I picked up one for less than $50 if I remember correctly and it is perfect. Many people

There were some selling very reasonably on eBay not too long ago; they still might be on there. Have you checked? Dave Casey (who is not currently selling any scopes on eBay)

Anyone have a Tek 503 that's looking for a new home? The 503's specs fit nicely as an output display for an analog computer project I'm working on. Or, perhaps there's a better, newer model the group

There is no such thing as a cheap differential probe. They have to be matched across a wide frequency range to have good CMRR. If you want a cheap CMRR the solution may be on your scope. All dual

A giant rubber band also works to hold the plugin in to the connector. Hobby stores sometimes sell them. There may be something wrong with your TM501 connector if the extender card falls out. I can't

I'll cite one example of a mod not having a 2-letter identifier. On at least some of the 7L12, 13, and 14 spectrum analyzers, before Option 39 was available the same effect could be had as "Mod 139U"

Hi H?kan, All of the instruments that I know of which have been modified have a Tek label that says something like "MOD WN". The MOD is always identified by two letters on every plugin that has a

Hi Velik, You did a great job! These look as good as the original skirt from Tek. I am very impressed with how all three dial's turned out. There are many times when members need to make replacement

Sadly, nothing under ?100 on fleaBay :-( Anything in the DIY arena ?? Dave

Try ebay. Bob

Can anyone suggest a source of the above ?? DC to 20MHz would be more than adequate. I don't even need a high voltage device - 30V would be OK, 100V would be better. I'd even consider a DIY or kit