- #1
Kurtisinger
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- TL;DR Summary
- Newton Brothers (Derby) Rotory Transformer: type 28
Thought I'd share this interesting old relic as I am unable to find any information about "type 28" on the Internet.
tech99 said:It looks like an aircraft transmitter high tension supply, 1200 V at about 400W. This would suite an 813 PA valve. On the other hand 12V is unusual for aircraft and I wonder if it was used in a workshop.
Interesting.. would think it would be 32v in, in those days.tech99 said:Yes, AC output looks wrong for an HT supply.
Baluncore said:Rotary Transformer Ref No 10K/21 s/n 1822;
Input 12V, 32 amps; Output 1200 volts 0.2? amp;
Newton Bros. (Derby) Ltd.
You will find references to the later Type 31 made for the RAF in 1940.
Your Type 28 example does not have the broad arrow that identifies government equipment.
The initials A M, either side of the crown suggests an English telegraph company, with appointment by the Crown. What is written on the crown x+y ?
It looks to me like it is a DC to DC converter. I suspect it generated high voltage for wireless telegraphy.
" Founded in 1899, Newton Derby has a long history of delivering generator solutions for technically demanding projects around the world.
The company was founded by the Newton brothers and one of the brothers, Mr Frederick Newton, had continued involvement of designing generators for aircraft in both world wars."
https://Newtonderby.co.uk/about/history/
AM means Air Ministry.Kurtisinger said:Sorry, I'm not to sure what you mean by: What is written on the crown x+y ? I don't see any writing on the crown.
Oh.. Thank you. So some aircraft must have had 12v. I picked it up with a pile of 32 volt motors that I have yet to catalog.tech99 said:AM means Air Ministry.
Because the name of the company changed in 1935 according to their website.Baluncore said:@Kurtisinger
How do you know it is a pre 1935 ?
From; History of Telegraphy, by Ken Beauchamp. Page 299. (Start of WW2).
"The requirements of combined operations with airborne formations led to the production of a transportable medium-range transmitter, the Type 76, mentioned earlier, which could be dropped by parachute or transported in a light vehicle. This operated in the 2–12MHz band and was designed for CW Morse transmissions. It was one of the first British military sets to make use of a crystal oscillator to provide up to six fixed transmission frequencies which, by appropriate anode tuning in the power amplifier, could be doubled to give twelve spot frequencies from the fundamental and second harmonic of the crystal oscillator. This type of ‘spot frequency set-up’ was valuable for mobile use when fully trained operators were not available. It was normally used as a battery operated transmitter from a 12 V supply, its HT supply provided by a rotary converter, but provision was made for mains operation in a suitable fixed station location. The receiver normally associated with this transmitter was the Type R109a, an eight valve superhet covering the same frequency range of 2–12 MHz and with a vibrator supply unit [38]."
From; https://www.qsl.net/g4bxd/uk.htm
"The British R-109 receiver, used with the WS 76 Sender, used by airborne forces, in Arnhem etc," ...
Baluncore said:I think you probably have a device from WW2.
https://www.gracesguide.co.uk/Newton_Brothers
The name changed in 1935 from what to what ?
But the pictures show the name “Newton Brothers (Derby) Ltd” was used in 1946 and 1961.
Excellent, thank you..tech99 said:The aircraft transmitter T1154 had a rotary transformer which looks very similar and called type 29. It gave DC output 1200 Volts 200mA from 12V. There is some information here, especually a pdf of the handbook: https://vk2bv.org/archive/radio/r1155.htm
I'm curious. Are you planing on cleaning it up and/or restoring it? A real beauty IMO. Thanks for sharing.Kurtisinger said:Summary:: Newton Brothers (Derby) Rotory Transformer: type 28
Thought I'd share this interesting old relic as I am unable to find any information about "type 28" on the Internet.
Hi digoff.. I was thinking that I would try to reunite it with the proper caps. Otherwise it appears to be in pretty good condition, bearings are snug and turn well. So far I think the only other thing that it's missing is one of the grease nipples.dlgoff said:I'm curious. Are you planing on cleaning it up and/or restoring it? A real beauty IMO. Thanks for sharing.
Sounds like a little restoring is going to happen. Let us know how that goes. :)Kurtisinger said:I was thinking that I would try to reunite it with the proper caps.
Will do..dlgoff said:Sounds like a little restoring is going to happen. Let us know how that goes. :)
That is a very good question. There is some information in the pdf that tech99 gave a link for about radio interference from the power supply but I just skimmed it briefly. Most of it is over my head. There are three variable resistors on it. One on the cord coming from 32v, and another dial that it runs into, and then there is a slider on the side of the board.Baluncore said:Maybe the coils and capacitor are a Twin T filter to keep RF out of the supply.
Is the variable resistor part of a voltage regulation circuit.
Does the spare brush fit either end of this unit?
How was it modified from 12 V to 1200 V; a factor of 100.
into 32 V to 110 V; a factor of only 3.4 ?
Well, I too value old electronic/electric equipment, but in this particular case I think a restoration (followed by trial runs, of course) would be a bit dangerous, so unless it is supported by sufficient knowledge about high(er) voltages I'm against it.dlgoff said:Sounds like a little restoring is going to happen.
I don't have any intentions of plugging it in, even if it only puts out 110v. It's just way to rare to be foolishly blowing up. Could probably figure out if it's a working machine with a meter alone and a little input from the people on these forums anyway. If there were a lot of them kicking around I'm pretty sure I would though.. : )Rive said:Well, I too value old electronic/electric equipment, but in this particular case I think a restoration (followed by trial runs, of course) would be a bit dangerous, so unless it is supported by sufficient knowledge about high(er) voltages I'm against it.
A pre-1935 vintage rotary transformer is a type of electrical transformer that was commonly used before 1935. It is a device that converts electrical energy from one circuit to another through electromagnetic induction.
A pre-1935 vintage rotary transformer works by using two or more coils of wire to create a magnetic field. When an alternating current is passed through one coil, it creates a changing magnetic field which induces a voltage in the other coil. This allows for the transfer of electrical energy from one circuit to another.
Pre-1935 vintage rotary transformers were commonly used in early electrical systems due to their ability to efficiently convert and transfer electrical energy. They were also more durable and reliable compared to other types of transformers at that time.
As with any electrical device, there are potential safety concerns when using a pre-1935 vintage rotary transformer. It is important to follow proper safety precautions and consult a professional if there are any concerns or issues with the transformer.
Yes, a pre-1935 vintage rotary transformer can still be used today. However, it may not be as efficient or reliable as modern transformers. It is important to ensure that the transformer is in good condition and meets current safety standards before use.