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That's the technique I used to clean seriously oxidized contacts on a 60 year old tube tester. DeOxit is great stuff. - Jim

Chiming in on ad-hoc variable AC supplies. We were building an automated mastering console that used 8080 processors. Development was done on an IMSAI 8080 computer and we needed a printer to

Hello there: Just an update: On 2465B, RE: Cover off CAL cooling: During HOR CAL 01, about 2 hrs total, all IC, Hybrid HS and U800 temps just slightly warm, did not need an external fan. RE: CAL

I have one of these Q service shows zero so not sure how much to charge say $15.00 and I can mail it in a padded envelope? Jim O

thanks guys! if you guys know of any 555 that anyone will part with and sell to me and be happy to ship to the great ole state of Maine keep me posted please! I have been bitten by the bug and I can

Thank you all for the insights and advice (by the way, I'm from Belgium). This evening I went over to the seller to test it. I'm proud to announce that the Tektronix Oscilloscope Owners Club has

Hi Fabio: There is a guy, of maybe more than one, that fixes old irreplaceable television CRTs... but, I've never heard of anyone doing CRTs for scopes. Maybe part of it is because the phosphor, and

Hi Jim- Yes sir, one parts unit is a necessity and several would be better! :-) The problem is that so many of these 500 series scopes are either fully functional or nearly so that it always hurts

During thermionic emission... where electrons are "boiled off" the filament, or the heated cathode.. they form a cloud in the space around those elements. Literally, it is a cloud of charged particles

Hi: I am looking for a 475, 475A, rear bezel.... the plastic plate (with cutouts) that fits under the rear feet. One from other models might fit too. (If people need the part number, I'll look it up

Still chasing a working copy or original of the Diagnostics Tape for the 4041. DaveB, NZ

I once had an RM35 with double-peaking. The beam stayed focused across the initial peak and dip, and only broadened when I cranked Intensity to max. YMMV, Dave

The 1A contacts and the 10B contact are also closed in those positions.? I don't have a PG506 with me now to check further. Bob.

Hello-- I have a Tek 555 manual as part of a bundle of Tek manuals (see below). I'm offering all of these manuals as a group to free some shelf space-- hence the bundle costs $26.00, or if you're

I recall something Peter Keller said to me when I asked him about this phenomenon. He mentioned that he didn’t have an explanation for it but he felt it could be a manifestation of cathode interface

On Thu, Feb 21, 2019 at 07:45 PM, Fabio Trevisan wrote: > > Hello Albert, > > > I don't see the rationale behind this. With rising grid voltage larger rings > > on the cathode disk take part in the

I do it, just have to look for the blue transparency film.

There are two different power supplies due to primary winding. Serial number dependant.

Not a pest. I wish I had help when troubleshooting my 555’s when I got them. And a bunch of other scopes too. I parted out many scopes because I couldn’t figure out how to fix them. That includes

Yeah, Tom, it's a good idea to have at least a second unit of any of this old equipment.? For comparison and for parts.? Now if I could just sell my wife on that idea....Jim Ford?Sent from my