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(second post on Aug 3 2024 Pacific Time) I looked for but did not observe HV secondary voltage changes correlated with the current surge related to transformer core remanence. So, I tried to generate

Don, I think you were onto something. I made a few changes to the setup since the previous session. I used to have just one of the low-voltage secondaries loaded. Now, the 6.3 V secondary is loaded

Thanks for posting that link Jim! The copy I had was not scanned using an OCR and thus wasn't searchable. Also, with the chapters, you can click on the section you want and it goes there

This pdf copy was scanned via OCR so it is searchable so it is much easier to find

Seems to be a "gussied up" S-40B.? This is labeled? Run 2 and was built Sep 17, 1953.? I've started r-capping it and will finish up when my cap stock is replenished next week.? My wife actually

I altered? my previous post but you might not notice it if you are not on email If I recall properly, the SX-17 had variations with time of build, and eventually became an sx-18. I wonder if it is

I meant to say that the Radiotron 4th edition is available as a PDF from several sources on the web, all free. For instance tubebooks.org Despite its age this continues to be a very useful and

You may want to look at "The Radiotron Designer's Handbook" 4th edition, chapter 16, section 7, p.694 ff. which has a fairly comprehensive survey of noise limiters as used in AM receivers. The Lamb

Jim thanks for these interesting articles and finding them I was a sleeping car porter in the summer of 1962., and remember those huge batteries in a ‘’BOX” under the car. and many older cars

I pulled down the user manual for the SX18 and had a look at the circuit. It looks to be much simplified to the SX17. Only one RF stage, no noise limiter. It uses a 6Q7 rather than 6R7 in the last

Found the

A little research shows farm windmills are mostly used to pump water. I could find nothing on power generating but likely they exist. I spent some time in the Michigan countryside when I was a kid.

Yeah, forgot the battery thing.....needed for when the wind didn't blow (didn't grow up on a farm) Tom L

I think you are right. Those familiar windmills could be generators or water pumps. If generators they were probably used to charge batteries. Oh well, another subject for research. There were

Richard, I think there was a lot of DC voltages on farms 'way back when'.....it seems the generators put out DC Tom Latimer

Jim, a very well written interesting article .. thanks Did anyone in NA make a 250 volt AC/dc radio? I’m not going to try searching. Sent: Thursday, August 1, 2024 3:47 PM To:

DC power still going strong in 2012 in San Francisco.See:? ?https://spectrum.ieee.org/san-franciscos-secret-dc-gridRegards,Jim Logic: Method used to arrive at the wrong conclusion, with

I think that this sort of drift can be problematical and a new subject should often be declared. But in a case like this one, some of the history brought up might help someone to know why a

Yes the C was the one that changed to a separately wired B- rather than using the chassis. I thought before it was the D but was wrong. Using the separately wired return allows complete isolation

Lots of radios had phono jacks. Partly to operate from a crystal phono pickup and also most of them put out audio from the detector for use in an external audio power amp. Crystal pickups had very