"Given your research, I went back and looked at mine again. My set speaker terminals are carefully ground off to remove the impedance.There is an 8 ohm matching resistor on the input (grid side) of the transformer:
and like yours, my output says 600…"
The Fine Things are Always Hand Made
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Kent King
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Kent King's Discussions
The Centennial Begins!
Started this discussion. Last reply by Norman S Braithwaite Jan 14. 11 Replies 4 Likes
100 years ago today (Dec 27, 1924), E. H. Scott used his World's Record Super in Tasman New Zealand and heard station WOC, Davenport, Iowa, a distance of almost 8000 miles. For the next 3 months,…Continue
AW 23 hum problem
Started this discussion. Last reply by Alex R. Whitaker Dec 18, 2024. 2 Replies 1 Like
Before you say "it's a filter cap", please read through the work so far:I acquired an AW23 early tuner only and restored it. However, it has an awful 60-cycle hum. Now, I have 4 operating AW23 sets…Continue
New Materials in the Scott Info Archive
Started Nov 24, 2024 0 Replies 3 Likes
I'm working on an article about the Scott WWII radios and this has prompted me to do a lot of research. I also put out a call for manuals and fellow site member Tony Peterson sent me a manual…Continue
Seeking Military Set manuals
Started this discussion. Last reply by Kent King Dec 4, 2024. 12 Replies 1 Like
If any of you have the following military set manuals, I would love to get clean copies:RBO-3RDOSLR-12 (any version)Thanks!Continue
Kent King's Page
Latest Activity
"Okay, the only thing I am finding that relates to a line impedance is the label on the speaker output terminal strip. It is marked 600-ohm speaker. However, measuring DC resistance across the terminals yields approximately 3-ohms. …"
"Those audio transformers appear to be swapped! The SLRM has a 500-ohm output which would match up with the 500-ohm winding of what you show as the output transformer. I'll investigate my Export receiver with amp and original speaker…"
"I think that I may have just found a purpose for my 510 amp. If I added a octal style plug to the SLR-H I could do away with the little accessory trans (pic upper left). That way I can still use it as a test fixture, it's current job. And …"
"Yes, this unit just connects to the speaker output from the set, driven by the 25L6s."
"So, with the outboard amp, the radio still have/run the pair of 25L6s? "
Scott Export Set and "amp"
Although it was built after the war, the Export set is a relatively scarce set. At the end of WW2, Scott was "stuck" with a large number of partially completed SLRM sets. They put a better face on them and the Export was born. They removed the BFO, but otherwise, the Export is an SLRM. The SLRM is an AC/DC (transformerless) set with AM and SW coverage. I have only ever seen 4 or 5 of these sets, however, there is an odd little thing going on. In the pics here, I provided the front and top view…See More
"Thanks for the explanation. I had not thought about how the noise floor would desensitize FM reception.
Norman"
"42 MHz was FM. But, the noise floor is there, nevertheless.....causing receiver desense. That was the reason that our radios all had noise blankers....not just for noise inside the vehicle, but from outside as well. I do see…"
"Interesting. I thought civil service radio communications in the 42-mhz band were FM. There was no shortage of noise sources in the early days of radio broadcasting and the noise sources were robust and widespread. Aside from…"
"However, there were a lot less machines around that generated electrical noise then than the millions of noise makers that are around today. I don't know.....if there had been equipment around back then to measure the noise floor,…"
"The noise floor was very high in the early days of broadcasting due to lack of noise suppression on all kinds of machinery including automobiles. The feat would be difficult to reproduce today due to crowded bands.
Norman"
"When I think about the noise floor, today, I think that Scott's reception feat from 100 years ago would not be able to be duplicated. Add in the fact that almost all those stations, like Dave P. said, are considered low power today, makes…"
"Several years ago, after I got my Allwave 23 working, I found and was able listen to Radio New Zeland for a few minutes.
Thom. "
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Scott Export Set and "amp"
Posted on January 18, 2025 at 8:30am 6 Comments 0 Likes
Although it was built after the war, the Export set is a relatively scarce set. At the end of WW2, Scott was "stuck" with a large number of partially completed SLRM sets. They put a better face on them and the Export was born. They removed the BFO, but otherwise, the Export is an SLRM. The SLRM is an AC/DC (transformerless) set with AM and SW coverage. I have only ever seen 4 or 5 of these sets, however, there is an odd little thing going on. In the pics here, I provided the front and top…
ContinueTwo Philharmonic sets for sale
Posted on November 29, 2024 at 8:24pm 3 Comments 0 Likes
Hey all...I have two Philharmonic sets taking up space and I won't be finding time to do anything with them...so I am putting them out here. The first is a red band deluxe (1939). This set has caps replaced and does play but needs additional work. The second is a 1937 pointer dial set with the "Chicago" dial. This set is unrestored but complete. Both sets include a tuner, amp and a 15 in speaker.…
ContinuePhilharmonic IF wiring - schematic errors
Posted on November 11, 2024 at 10:50am 7 Comments 0 Likes
I'm working on a 1939 Beam of Light Philharmonic Deluxe and noticed a wiring error (ok, maybe)...in looking at the schematics available, it gets worse. Refer to the 3 images attached as needed. Here we go:
In the 1937 schematic, and in most sets I've worked on, pin 8 (cathode) and pin 5 (grid #3, usually tied to the cathode) go directly to ground. Pin 5 (at ground) is used as a tie point for the "pass through" caps in the IF cans. In the 1939 schematic, it looks like Scott added a…
ContinueAWA Shares on E. H. Scott Centennial
Posted on October 11, 2024 at 5:16pm 4 Comments 0 Likes
Next Wed evening (10/16), I will be presenting on E. H. Scott and his radios on the AWA Shares monthly Zoom meeting:
https://www.antiquewireless.org/homepage/awa-shares/
You do not have to be a member of AWA to attend, but you do need to register prior to the talk. I hope some of you are able to join me - I've got some neat pictures and info to share.
Kent
Comment Wall (21 comments)
- At 10:58am on October 30, 2023,
Thomas Day said…
Hi Kent:
I can send the money for the power supply Wednesday. Let me know how and where to send it. iI have used paypal in the past.
Thanks Thom. 6448 S Fairfield Ave. Chicago, Il 60629. 7737324913
- At 11:08am on April 27, 2022,
Bill Whelan said…
Hi Mr. King- I trust you have seen many of the customer cabinets that EH Scott customers commissioned in the 1930. I a trying to identify if this cabinet originally has EH Scott electronics installed in it. If not, any ideas?
Thanks you, Bill Whelan
- At 6:28pm on July 16, 2021,
norman david warren said…
got the trimmer ok Thanks Norman W.
- At 12:52am on July 29, 2018,
Ralph Kearton said…
Hi Kent
I'm Keen to get a copy or the collectors guide
However I would need it shipped to NZ
The eBay listing doesn't ship herec
Got any ideas as to. How I can get one
I've just signed up to pay pal if that helps
Cheers Ralph kearton
- At 5:57pm on January 28, 2017,
Kent King said…
that image is great! I will add it to the archive. Thank you!
- At 2:50pm on January 28, 2017,
Joseph W Strickland said…
Kent;
I hope this attachment works. I finished the composite figures 26 and 30 for the Late version 800B. I found this helpful in tracing out the electric tuning arrangement of the 800B receivers.
Joe
If this turns out to not be satisfactory resolution and detail, let me know and I will try sending the *.pdf file which is 5.3MB.
Joe
- At 1:58pm on January 14, 2017,
Kent;
I took a closer look at the Late 800B parts radio tuner chassis that I have. It is SN 6182 and I found its final test stamp inside the preset tuning assembly backplate and the date is Jan 15, 1947. So that one can be added to your database.
I took the time to take a good photo of the Late version 800B AM SW RF compartment underneath. This unit has never had any parts replaced in that area, so this part of it is unmolested. I had just noticed that the Early version SN 1035 that I have had already been worked on and there were some changes to bypass capacitor placement that I do not agree with. My intent is to put it back as close to original lead dress and parts placement as possible. Sometimes changes in part placement and lead dress can cause significant problems to develop and result in inability to properly align RF circuits.
Joe
- At 7:34am on November 23, 2016,
Thanks you! I have added your cleaned up diagrams to the Scott Info Archive 800B folder. Your work is greatly appreciated!
Kent
- At 4:50pm on November 21, 2016,
Kent;
Yes I am willing to contribute these for fellow members and others use. I enjoy doing this type of work. I was originally in product documentation at Collins Radio which included doing schematics.
Joe
- At 8:00am on November 21, 2016,
Joe -
That's great...when you get them done, I will post them in the archive if you are willing. All such work helps everyone here. That is what this forum is all about!
Kent
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