Tektronix was surely a very minor user of beeswax for high voltage transformers. All TV's back in the 50's and 60's used beeswax transformers is far greater quantities and at higher voltages then the

Thanks, I can see where the sticker was, only the stickum is left.

I have a 576 but the serial number is partially worn off. It is B32??7P. The second ? might be a 0 or 8. Is there anywhere else on the unit that has the serial number. i also have a 176 plug in, does

I have 10 or more Tek analyzer probes, wires, and clips that I have no use for. These are 92a96 probes with breakout cables and clips. Time to clean up my shop. Free for the postage. Send a private me

GPIB requires logic circuits, generally a microprocessor, to operate. The 576 predates all of that, it certainly predates microprocessors.

It seems that you could do the same thing with a HP 663X series of power supplies. With one supply you could plot 2 terminal devices and with a second supply you could do a full curve trace of 3 termi

In thinking about this I originally thought that you needed 4 quadrant supplies but you don't. A regular supply will do. By 4 quadrant I mean a device that can both supply and absorb power in a linear

The trace speed, 60 Hz, is way too fast for a mechanical plotter. All of that old equipment that could drive a plotter could be slowed down to the plotter speed, the speed of the 576 cannot be changed

I may be asking a dumb question, but why do you need a 576 if you want a curve tracer? Could you not do the same thing with 2 computer controlled power supplies? That and some software could character

A long time ago in the early 80's the Massachusetts hams ran an auction at Honeywell Inc in Billerica. You could bring your old electronic stuff and they would auction it off. It was great fun and alw

It is a common practice for companies to obtain patents that infringe on other patents that are owned by same company. The Patent Office allows this. Check the cited references, all but one are owned

Rotary converters are a little more complicated. A rotary converter is tuned to produce a proper 120 degrees shift among the three legs and to produce an equal voltage on each leg at one rated load on

Diopters is the focal length in meters inverted. Drug store reading glasses are sold by diopter strength. https://en.wikipedia.org/wiki/Dioptre Pete.

That is pretty clever. Perhaps scanning on a bed scanner is unlikely to produce usable results. What about these on eBay? https://www.ebay.com/itm/172002387526 or https://www.ebay.com/itm/232619073858

I had a look for any old microfiche but did not find any. My Epsom V700 scanner came with a number of film carriers of various sizes. One looked like it could hold 2 microfiche but it was just a littl

The microfiche manuals seem to be very well organized in those files. It is also likely that a lot of stuff is already available online as scans. Here is a suggestion for identifying those films with

Get a SCSI2SD converter card instead. Worked great for me in my 16702. This uses SD cards as the storage device so you are not locked into (very) old rotating media. One great thing about using a SD c

All of the emails that I get from this group are duplicated. In the "Edit Subscriptions" section of my account under "Email Delivery" I have "All Emails" checked. This is what I want but the problem i

One nice thing about that one is that it has all the knobs. That is pretty rare for a 576. By the way, I am looking for some knobs for my 576. They are the "variable collector supply", the "polarity",

If I click on the actual signal part of the display I can get it to turn green. The scale and text also changes color. You can also see that the moving display is a GIF file where the instrument is a