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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

Yes, back in the 70’s big steel mill motors were all DC, but by then most were SCR driven and could be very smooth, with few contactors to wear out. That left the problem to be the commutators and

Seems to me I suggested a polarized plug, and somebody asked if that could be used to connect to DC mains, and were there any DC “mains” left? And, yes I took it further, afield, and tried to

Looking at the schematic it seems almost identical to the S-40B with the exception of the "Phono" switch and related circuitry.? I doubt I'll ever hook a turntable to it but maybe back in the day it

If I recall properly, the SX-17 had variations with time of build, and eventually became an sx-18. I wonder if it is more like an SX-18? august 3? sorry all this^ is total hogwash, I never learn

I used to install wheelchair lifts. They always used to have 1 HP AC motors and were always noisy. The whole lift would vibrate. They started offering DC versions and they were so quiet and smooth and

Known as subject drift. Maybe I made that up. So, one can change the subject to something more appropriate but loose the continuity in the archive or continue to use a subject that has nothing to

What does this subject have to do with tuning shaft query?

Manhattan for years had steam plants that generated steam for industrial use. The New York Steam Company was one. The steam was distributed via pipes underground and one can see pictures of steam

Yes, there were many AC/DC sets previous to the AA5. The AA5 uses a set of tubes designed for series heater use one 115V circuits without the need for an additional dropping resistor. Some earlier

Another reason that early – and still, many, many – elevators run on DC is that a shunt would motor produces huge torque while starting. Add to that, a number of relays (contactors) with

The mod to the SX-28 is a major one. The SX-28 was built with a Lamb noise blanker, AFAIK the first application of Lamb's patent. Unfortunately, it didn't work very well so, eventually, an

Manufacturing facilities and workshops used to distribute water or steam power from a limited number of sources (sometimes just one) via shafts, pulleys, belts, etc. to machine tools of various types.

In the late 1940s while I was living in Oakland, CA at about age 7, I dimly recall the adults discussing whether an electric train they were setting up for me should be set up to operate from AC or

Hi gang, The 6H6 dual diode was used in many Hallicrafter rx's, as noise tube. Check Bama for: S85, S40, and other series rx's schematics. I have an S85, that is wired as an late S40B, for the noise

Someone pointed me to a link here: https://bama.edebris.com/download/hallicra/sx17/sx17.pdf This version of the manual does have the circuit which contains the 6H6 along with modified BOM list, so

First town to be electrified using overhead wires, Roselle, NJ, 19 January 1883,