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Candles of the Regency era were of variable composition, depending on what you were willing to spend. Faraday used whatever was handy to get the job done. He didn’t need to immerse his coils

Tom, Sealing wax, according to wikipedia, can contain beeswax. I'm a little surprised that candle wax would be used to try to hold a transformer together, my impression of it is that it is both

Faraday himself was one of the first, if not the first, to use beeswax in a coil and transformer. I’ll have to look that up again to confirm the details but in his case I believe it was just a

So I had one of those is stock. I installed and I still have low voltages across power supply and adjusting R938 has no affect on the voltages. I checked (R937/938/939, VR943 ) Vr 943 was bad, but has

Oddly, the wikipedia entry does not list any use for beeswax in electronics, either current or historical, similarly the electrical properties of beeswax are not discussed. I'm very curious how

As I understand things, if the CRT is gas free, rejuvenation will last a very long time... but if there is gas, the cathode can quickly crust over again, and you will be back where you started...

It would. -Chuck Harris Charles wrote:

How about a 1N4735A?

It looks like vr943 is bad! service manual says it 6.2v 5% 0.25m, do-7. mfr code 04713. mfr part number szg20012 any modern equivalent suggestion please R A

One of my 561's has a severely double-peaking CRT and it's not that bright. Voltages are in spec. It's probably not worth locating and buying a new CRT (especially if the USPS is going to handle the

Thanks to tireless photography from my son, I was able to put a lot of cheap but useful items up on the site for anybody doing Tek or HP repairs. Have a look here:

Harvey, thanks for the explainer, between that and the Theory of Operation section I should be able to figure out what's going on in the -15 V regulator. I went back to the start, found an appropriate

The following photos have been updated in the Sampling with 3S2 ( /g/TekScopes/album?id=261250 ) album of the [email protected] group. * DSCF0213.JPG (

Great progress, Charles — nice to see persistence win over Murphy! Cheers Tom Sent from my iThing, so please forgive typos and brevity.

This afternoon I was busy tweaking the trigger circuit, especially the 10 ma leaded tunnel diode I'd tacked in place of the defective D42 trigger regenerator. Part of the problem was excessive lead

And mine is definitely one of them! Chuck, I can send you a picture if that would help.

Hi, Yeah, it looks like you're correct there were brown epoxy impregnated transformers in the 561B series. The manual I have (from Shannon Hill's collection) lists 3 different revisions of the

?To set the record straight, I post this with a new title. To you who reads only this post: After sitting idle for four years, my 547 with Bill Schell rewound HV transformer exhibited the classic HV

I didn't impregnate my low-tech 453 rewind. Hang on for ten more years, maybe you'll see a post titled "Dave Wise HV rewind failed" :)? ________________________________ Sent: Friday, March 05, 2021

Background: Production below S/N 7000 uses a pair of 8056 Nuvistor at the input. At 7000 they are replaced by a dual JFET. V114 is on the A (plus) side, V214 is on the B (minus) side.?? One section is