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I received another patient...this time it's a 454 that is outwardly fine (actually it's in superb condition), but had a very serious HV fault. Apparently the previous user was using it and it started

As I recall, it is secreted on trees, scraped off and cleaned somehow. Over the past thirty years or so there have been numerous articles about the origin of shellac in Fine Woodworking magazine. That

Is it secreted? I always thought it was distilled from the bug's shell. -Dave

Probably came from a hamfest, the yellowsheet, gift from friend, etc. Stuff I sold on eBay made it to Hawaii, Japan and Europe.... Also lots of stuff from St Louis migrated eastward. then there is

That or Y-12, but I don't recall if Hughes was ever involved with Y-12. Sean

Hi, Tom. I received the UF4004 Ultra fast diodes and replaced the 1N4004 diodes in the circuits loading the secondary of transformer T710 but to no avail. The behavior hasn't changed. Just curious

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

Well, there is shellac, based on a resin secreted by the lac bug. It’s probably not useful for transformers, though. DaveD

As said earlier the shutter is of no concern (somebody here mentioned magenta when I disconnected the shutter: if you look closer there is magenta on the right lower corner, blue on the left and green

Knowing what makes "beeswax" beeswax? Well real Bees wax is the wax from a bee (generally in the US, Apis mellifera), from a gland when the bee is young and taking care of the brood in the hive. The

Can we use other animal's wax? Maybe caterpillars or wasps?

When I was in high school a retired professor who had a long-time habit of buying electronic equipment at military surplus

In the 90's there were some issues with CRT's on color TDS's showing a blue band on the CRT about a third of the screen area in size and located in the upper region. It didn't look exactly like yours

Jeff wrote: There are two separate display controllers in the TDS700 series, I presume that the 500 series color circuitry is similar.

Hi Martin, would you think that the dual FETs Teledyne SU2369A would be useful for your application I can send you a couple. Contact me off list. G?ran

Roy Thistle wrote: I don't think is exactly that we don't know what beeswax is, but that it's a common name for a set of similar substances based on their source, not on their chemical constituents.

Rather than fiddle around with driver stages, I decided to try Albert's suggestion of driving the TD directly from the last hex inverter (+5 to anode of TD, cathode to trimpot to TTL output). Somewhat

Confirmed, I have: meter hi: red meter lo: white -15V: black gnd: green +15V: red +5V: red [email protected]> wrote: -- Andy

Okay, I've done a little research on the Tek color shutter system, and it seems to involve not 3 colors, but actually 4 colors: Red, Green, Blue, and White. So the white regions are NOT being

My impression is that potting or coating compounds are ofte a mixture of bee's wax and rosin. Maybe of different waxes. To fill the voids it may be necessary to boil the transformer (or whatever) in