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 apologize, but
here we are. Self moderation does not work well, especially with us ADD
prone members. It is rather late but I’ll try to compensate a bit

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 might have been
a useful feature.
73,
--
Justin B.
KI5GKD

?

?

?

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

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

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 sets used
balast tubes or series resistors mounted in metal cans or "curtain
burner" resistive line cords. More complex radios used different
combinations of tubes but the idea was to have the filaments run
directly off the line.
BTW, the Germans had a set of tubes after WW-2 also made for AC/DC
specials but for 240 volt lines. The notorious tube used in the
Telefunken (Neumann) U-47 microphone was a high voltage heater tube,
designed for that use. Its purpose in the U-47 was to run the heater off
the same supply as the bias for the microphone element. The more
expensive, variable pattern mic, the M-49, had a conventional power
supply since it had to have variable bias to change the directional
pattern.

On 8/1/2024 2:21 AM, Jim Whartenby via groups.io wrote:

First town to be electrified using overhead wires, Roselle, NJ, 19
January 1883, See:
. <>

To answer the question on what prompted the development of? AC/DC radios
was the elimination of the most expensive single component in an AC
powered radio, the power transformer.? It seems that the AC/DC radio
design predates the AA5, see:
<>? This shows the Stewart Warner Model R-108 circa 1933.

Regards,
Jim



Logic: Method used to arrive at the wrong conclusion, with confidence.
Murphy


On Thursday, August 1, 2024 at 03:11:25 AM CDT, don Root
<drootofallevil@...> wrote:


I saw another article or two indicating DC to an area of mostly textiles
, and elevators in ?apartments. My guess would be that houses, apt
units, would want the new gadgets that mostly ran on AC, but the
elevators would be a costly upgrade. Here in southern Ontario in the
1950’s 25 cycles was replaced with 60 cycle, and the hydro co/govt did
conversions or bought you a new washing machine etc.

Sorry to everyone for my part in hijacking 110 AC/DC and twisting it up
to HVDC etc

*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Richard Knoppow
*Sent:* Thursday, August 1, 2024 3:39 AM
*To:* [email protected]
*Subject:* Re: [HallicraftersRadios] S-38B Tuning Shaft Query

I don't know. The articles I found don't make it clear. I can't even
find a list of cities that had DC power. Evidently New York, or at least
Manhattan did and parts of Boston. Power was distributed to buildings
and factories but I can't find specific references to homes.
There is a pretty extensive article on the "war of the currents" at
<
<>
Which has some information on early power distribution, but you link
this so have already read it.
Now, comes the question of why Hallicrafters and virtually all other
radio manufacturers made AC/DC radios and phonographs. Was there a big
market or was it due to the economy of not having to use transformers?
Since transformerless sets could operate inherently on both AC and DC
the DC might just have come with the territory. DC was also used on many
ships and boats so radios made to work on them would have to run on DC.
But, Hallicrafters made an AC/DC version of the S-40 receiver as the
S-52 and later the S-77. These were advertised as marine receives but
don't have the MF marine band, they are essentially the same as the S-40
series with some changes in tubes to allow series heaters. So, perhaps
the marine market was large enough to justify manufacturing them.
You have piqued my curiosity so I will do some more searching.

On 7/31/2024 4:40 PM, don Root wrote:

Richard, just for the record, did they distribute DC to homes? Exactly where


<>
<
<> ??talks about it,
and just says “customers”, with no mention about houses or special
businesses.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

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. "Elements of
Mechanics and Machine Design," authored by Erik Oberg and published by
The Industrial Press in 1923 provides design information for such
shafting even through electric motors had been available for quite a few
years. The motors must have still been expensive enough during the
1920s to justify all that shafting and associated components so that
only a limited number of motors (maybe only one) would be required.
Maybe transformers were also very expensive early on and remained that
way for awhile.

73,

Maynard
W6PAP

First town to be electrified using overhead wires, Roselle, NJ, 19
January 1883, See:
. <>

To answer the question on what prompted the development of? AC/DC radios
was the elimination of the most expensive single component in an AC
powered radio, the power transformer.? It seems that the AC/DC radio
design predates the AA5, see:
<>? This shows the Stewart Warner Model R-108 circa 1933.

Regards,
Jim



Logic: Method used to arrive at the wrong conclusion, with confidence.
Murphy


On Thursday, August 1, 2024 at 03:11:25 AM CDT, don Root
<drootofallevil@...> wrote:


I saw another article or two indicating DC to an area of mostly textiles
, and elevators in ?apartments. My guess would be that houses, apt
units, would want the new gadgets that mostly ran on AC, but the
elevators would be a costly upgrade. Here in southern Ontario in the
1950’s 25 cycles was replaced with 60 cycle, and the hydro co/govt did
conversions or bought you a new washing machine etc.

Sorry to everyone for my part in hijacking 110 AC/DC and twisting it up
to HVDC etc

*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Richard Knoppow
*Sent:* Thursday, August 1, 2024 3:39 AM
*To:* [email protected]
*Subject:* Re: [HallicraftersRadios] S-38B Tuning Shaft Query

I don't know. The articles I found don't make it clear. I can't even
find a list of cities that had DC power. Evidently New York, or at least
Manhattan did and parts of Boston. Power was distributed to buildings
and factories but I can't find specific references to homes.
There is a pretty extensive article on the "war of the currents" at
<
<>
Which has some information on early power distribution, but you link
this so have already read it.
Now, comes the question of why Hallicrafters and virtually all other
radio manufacturers made AC/DC radios and phonographs. Was there a big
market or was it due to the economy of not having to use transformers?
Since transformerless sets could operate inherently on both AC and DC
the DC might just have come with the territory. DC was also used on many
ships and boats so radios made to work on them would have to run on DC.
But, Hallicrafters made an AC/DC version of the S-40 receiver as the
S-52 and later the S-77. These were advertised as marine receives but
don't have the MF marine band, they are essentially the same as the S-40
series with some changes in tubes to allow series heaters. So, perhaps
the marine market was large enough to justify manufacturing them.
You have piqued my curiosity so I will do some more searching.

On 7/31/2024 4:40 PM, don Root wrote:

Richard, just for the record, did they distribute DC to homes? Exactly where


<>
<
<> ??talks about it,
and just says “customers”, with no mention about houses or special
businesses.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

PS, I am aware that the 6H6 was used as a modification in the SX28 and I
have found and downloaded a circuit diagram for that modification as a
reference. Possibly the SX17 circuit might be be similar but it would be
interesting to hear whether anyone else has encountered this valve in
the SX17?

I don't know. The articles I found don't make it clear. I can't even
find a list of cities that had DC power. Evidently New York, or at least
Manhattan did and parts of Boston. Power was distributed to buildings
and factories but I can't find specific references to homes.
There is a pretty extensive article on the "war of the currents" at
<
<>
Which has some information on early power distribution, but you link
this so have already read it.
Now, comes the question of why Hallicrafters and virtually all other
radio manufacturers made AC/DC radios and phonographs. Was there a big
market or was it due to the economy of not having to use transformers?
Since transformerless sets could operate inherently on both AC and DC
the DC might just have come with the territory. DC was also used on many
ships and boats so radios made to work on them would have to run on DC.
But, Hallicrafters made an AC/DC version of the S-40 receiver as the
S-52 and later the S-77. These were advertised as marine receives but
don't have the MF marine band, they are essentially the same as the S-40
series with some changes in tubes to allow series heaters. So, perhaps
the marine market was large enough to justify manufacturing them.
You have piqued my curiosity so I will do some more searching.

On 7/31/2024 4:40 PM, don Root wrote:

Richard, just for the record, did they distribute DC to homes?
Exactly where


<>
<
<> ??talks about it,
and just says “customers”, with no mention about houses or special
businesses.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

I don't know. The articles I found don't make it clear. I can't even
find a list of cities that had DC power. Evidently New York, or at least
Manhattan did and parts of Boston. Power was distributed to buildings
and factories but I can't find specific references to homes.
There is a pretty extensive article on the "war of the currents" at
<
<>
Which has some information on early power distribution, but you link
this so have already read it.
Now, comes the question of why Hallicrafters and virtually all other
radio manufacturers made AC/DC radios and phonographs. Was there a big
market or was it due to the economy of not having to use transformers?
Since transformerless sets could operate inherently on both AC and DC
the DC might just have come with the territory. DC was also used on many
ships and boats so radios made to work on them would have to run on DC.
But, Hallicrafters made an AC/DC version of the S-40 receiver as the
S-52 and later the S-77. These were advertised as marine receives but
don't have the MF marine band, they are essentially the same as the S-40
series with some changes in tubes to allow series heaters. So, perhaps
the marine market was large enough to justify manufacturing them.
You have piqued my curiosity so I will do some more searching.

On 7/31/2024 4:40 PM, don Root wrote:

Richard, just for the record, did they distribute DC to homes?
Exactly where


<>
<
<> ??talks about it,
and just says “customers”, with no mention about houses or special
businesses.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

?

I don't know. The articles I found don't make it clear. I can't even
find a list of cities that had DC power. Evidently New York, or at least
Manhattan did and parts of Boston. Power was distributed to buildings
and factories but I can't find specific references to homes.
There is a pretty extensive article on the "war of the currents" at
<>
Which has some information on early power distribution, but you link
this so have already read it.
Now, comes the question of why Hallicrafters and virtually all other
radio manufacturers made AC/DC radios and phonographs. Was there a big
market or was it due to the economy of not having to use transformers?
Since transformerless sets could operate inherently on both AC and DC
the DC might just have come with the territory. DC was also used on many
ships and boats so radios made to work on them would have to run on DC.
But, Hallicrafters made an AC/DC version of the S-40 receiver as the
S-52 and later the S-77. These were advertised as marine receives but
don't have the MF marine band, they are essentially the same as the S-40
series with some changes in tubes to allow series heaters. So, perhaps
the marine market was large enough to justify manufacturing them.
You have piqued my curiosity so I will do some more searching.

On 7/31/2024 4:40 PM, don Root wrote:

Richard, just for the record, did they distribute DC to homes? Exactly where


<> ??talks about it,
and just says “customers”, with no mention about houses or special
businesses.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

?

I don't know. The articles I found don't make it clear. I can't even
find a list of cities that had DC power. Evidently New York, or at least
Manhattan did and parts of Boston. Power was distributed to buildings
and factories but I can't find specific references to homes.
There is a pretty extensive article on the "war of the currents" at
<>
Which has some information on early power distribution, but you link
this so have already read it.
Now, comes the question of why Hallicrafters and virtually all other
radio manufacturers made AC/DC radios and phonographs. Was there a big
market or was it due to the economy of not having to use transformers?
Since transformerless sets could operate inherently on both AC and DC
the DC might just have come with the territory. DC was also used on many
ships and boats so radios made to work on them would have to run on DC.
But, Hallicrafters made an AC/DC version of the S-40 receiver as the
S-52 and later the S-77. These were advertised as marine receives but
don't have the MF marine band, they are essentially the same as the S-40
series with some changes in tubes to allow series heaters. So, perhaps
the marine market was large enough to justify manufacturing them.
You have piqued my curiosity so I will do some more searching.

On 7/31/2024 4:40 PM, don Root wrote:

Richard, just for the record, did they distribute DC to homes? Exactly where


<> ??talks about it,
and just says “customers”, with no mention about houses or special
businesses.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998