?

TEST image formats GIG ,TIF, PNG, JPG??

I WILL DELETE POSTING IN 1,2 DAYS, UNLESS SOMEBODY WANTS IT LONGER

?

骋滨贵…………………..

--
don??? va3drl

It looks to be in nice shape. Good luck with it. It looks like an S40B
with a 5R10 dial on it, minus the BFO.

?

Turns out the last DC in the US was Con Edison in NYC, discontinued
in 2007. However converters were installed in some buildings to operate
devices requiring DC.

On 7/31/2024 10:22 AM, Richard Knoppow wrote:

If the neutral side of the line is really neutral. The rule in the
old days, as detailed in most handbooks, was to put the plug in to get
minimum hum. Of course on DC the set would not work if the plug was in
the wrong way. Is there anyplace now with DC current? Was once common on
ships. Must be pretty rare. I think NYC still had some DC until fairly
recently due to elevators and other machinery requiring it.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

My original post was about the materials use for the S-38B tuning
extension shafts. Having now pulled the chassis out of the radio, it
turns out that the shafts, which were made of plastic, had been snapped
off just inside the case. What made me think they were extension shafts
were some spacers that had been added between the metal case and the
tuning shaft support brackets. I will make up two new shafts from plastic.
Sorry to give mis-information at the start of the post, but the ensuing
conversation has been most enlightening.
Cheers
Ron Sharp
VK2IRS
Burrill Lake NSW
Australia

My original post was about the materials use for the S-38B tuning extension shafts. Having now pulled the chassis out of the radio, it turns out that the shafts, which were made of plastic, had been snapped off just inside the case. What made me think they were extension shafts were some spacers that had been added between the metal case and the tuning shaft support brackets. I will make up two new shafts from plastic.

?

Sorry to give mis-information at the start of the post, but the ensuing conversation has been most enlightening.

?

Cheers

Ron Sharp

VK2IRS

Burrill Lake NSW

Australia

Richard,? no doubt there is still DC and maybe 25 cycle AC, but all this
is limited to specific plants, maybe dedicated electric transportation,
large mining and such.

I have not seen? any consumer item in North America intended for
connection to ?“DC mains” .

There are still many DC motors in use , but rotary or static converters
get power from AC “mains” at 120V, 460V, 600V, 2300V, 4160V, 13,000V and
much much higher for HVDC transmission , and I just now ?bumped into
this at


<>

And I started all this Nelson River planning as a student at Manitoba
hydro Planning department.. all those hydro stations, and just maybe
connect those very long lines using HVDC at something like 700,000 volts.

Also see


<>

here is the line on a map.

So DC is not dead, but I doubt there is a 110 DC outlet in any North
American house, but I’m ready for backlash and getting re-educated.

Oh sorry , I’m on double time now!

?

Yes – because DC has no “crest factor,” it makes greater efficient use of transmission.? The peak, average, and RMS values for DC are all the same, reducing insulation requirements and eliminating the periods of the AC wave where the instantaneous RMS current is more than the time-averaged RMS current. As we remember I squared R is the formula for loss, so less loss, less heat, smaller conductors, and cheaper insulators!

Plus – no synchronization problems!!

Interesting return to Edison’s original idea – but without the DC generators he had hoped to see every few blocks in cities, and to homes in rural areas!

Mike/
K5MGR

?

Richard,? no doubt there is still DC and maybe 25 cycle AC, but all this is limited to specific plants, maybe dedicated electric transportation, large mining and such.

I have not seen? any consumer item in North America intended for connection to ?“DC mains” .

There are still many DC motors in use , but rotary or static converters get power from AC “mains” at 120V, 460V, 600V, 2300V, 4160V, 13,000V and much much higher for HVDC transmission , and I just now ?bumped into this at ?

And I started all this Nelson River planning as a student at Manitoba hydro Planning department.. all those hydro stations, and just maybe connect those very long lines using HVDC at something like 700,000 volts.

Also see

here is the line on a map.

?

So DC is not dead, but I doubt there is a 110 DC outlet in any North American house, but I’m ready for backlash and getting re-educated. ?

Oh sorry , I’m on double time now!

?

?

If the neutral side of the line is really neutral. The rule in the
old days, as detailed in most handbooks, was to put the plug in to get
minimum hum. Of course on DC the set would not work if the plug was in
the wrong way. Is there anyplace now with DC current? Was once common on
ships. Must be pretty rare. I think NYC still had some DC until fairly
recently due to elevators and other machinery requiring it.

On 7/31/2024 9:41 AM, don Root wrote:

Yea and now that the 1940s,? 50s, etc have past most people have
polarized outlets, so you now can polarize the plug properly, so you
don’t get a hot chassis.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998 ??

--
don??? va3drl

?

K2WH

?

If the neutral side of the line is really neutral. The rule in the
old days, as detailed in most handbooks, was to put the plug in to get
minimum hum. Of course on DC the set would not work if the plug was in
the wrong way. Is there anyplace now with DC current? Was once common on
ships. Must be pretty rare. I think NYC still had some DC until fairly
recently due to elevators and other machinery requiring it.

On 7/31/2024 9:41 AM, don Root wrote:

Yea and now that the 1940s,? 50s, etc have past most people have
polarized outlets, so you now can polarize the plug properly, so you
don’t get a hot chassis.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998 ??

?

Turns out the last DC in the US was Con Edison in NYC, discontinued
in 2007. However converters were installed in some buildings to operate
devices requiring DC.

On 7/31/2024 10:22 AM, Richard Knoppow wrote:

If the neutral side of the line is really neutral. The rule in the
old days, as detailed in most handbooks, was to put the plug in to get
minimum hum. Of course on DC the set would not work if the plug was in
the wrong way. Is there anyplace now with DC current? Was once common on
ships. Must be pretty rare. I think NYC still had some DC until fairly
recently due to elevators and other machinery requiring it.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

If the neutral side of the line is really neutral. The rule in the
old days, as detailed in most handbooks, was to put the plug in to get
minimum hum. Of course on DC the set would not work if the plug was in
the wrong way. Is there anyplace now with DC current? Was once common on
ships. Must be pretty rare. I think NYC still had some DC until fairly
recently due to elevators and other machinery requiring it.

Yea and now that the 1940s,? 50s, etc have past most people have
polarized outlets, so you now can polarize the plug properly, so you
don’t get a hot chassis.

?

1.???? This is a free group for members except for me which I pay out of my pocket and have been for 20 years (Has it been that long? :)

2.???? The storage space on this group is 30gb not 1gb.

3.???? You guessed right, I do remove images from time to time that have been sitting and forgotten for some time when the image repository reaches about 100-125 images and especially when the same image is in storage multiple times, copied and repeated in replies.? Then I start to trim it down.? Why do I do that because as you say, its wasteful of space and just a habit of mine going back to the ol Radio Shack Model 1 day.

K2WH
??