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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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9th Jun 2018, 10:44 pm | #21 |
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Re: A quiz, old time colour codes.
That's where Kalee gets the orange screen grid from, not the same colours as the UK ones, its not as comprehensive list as the one I have.
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9th Jun 2018, 10:52 pm | #22 | |
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Re: A quiz, old time colour codes.
Quote:
https://www.americanradiohistory.com...%22transformer winding code%22 Lawrence. |
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9th Jun 2018, 11:02 pm | #23 |
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Re: A quiz, old time colour codes.
Sorry, explain for a tired oldy what RECMF is please.
Anyone worked out which book I have yet? Clue, Iliffe is the publisher. Last edited by Boater Sam; 9th Jun 2018 at 11:04 pm. Reason: added |
9th Jun 2018, 11:33 pm | #24 |
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Re: A quiz, old time colour codes.
So far as I know:
https://www.allacronyms.com/RECMF/Ra...ers_Federation Wireless Servicing Manual....Cocking: https://archive.org/stream/in.ernet....h/colour+codes Pies? Lawrence. |
9th Jun 2018, 11:47 pm | #25 |
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Re: A quiz, old time colour codes.
Pasties at the next Adlington auction if you wish Lawrence, well done. Do you come north ever?
Or I have 2 sets of Admiralty books you could have to use as a reference source. |
10th Jun 2018, 12:05 am | #26 |
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Re: A quiz, old time colour codes.
Haven't been up North for a few years now Sam, not likely to, donate any prizes to a worthy cause or whatever.
Lawrence. |
10th Jun 2018, 8:45 am | #27 |
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Re: A quiz, old time colour codes.
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10th Jun 2018, 9:07 am | #28 |
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Re: A quiz, old time colour codes.
Ahh So, Tung Sol Lamp Co.
Thanks, that may be useful. Is there anyone without the Cocking book who cares to have a crack at the transformer leads code? Sam. Last edited by Boater Sam; 10th Jun 2018 at 9:09 am. Reason: added |
10th Jun 2018, 9:10 am | #29 | |
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Re: A quiz, old time colour codes.
Quote:
https://www.powerstream.com/wire-fusing-currents.htm and the lowest I can see is 40AWG Tin wire which is only 0-.0031" dia has a fusing current of 280mA. John |
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10th Jun 2018, 10:03 am | #30 |
Nonode
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Re: A quiz, old time colour codes.
Must dash, due to forthcoming rain & PVC roofing to finish sealing. Just a quick jolt of memory for valve voltages - Twin Brown = heaters straight from Sec winding, but Brown & Black(Earth) if one leg of the heater winding is earthed. Yellow = Cathode, Green = Grid, Red = Screen, & Blue = Anode. These include associated circuitry. This was just a basic code taught in passing during early RAF training. Cant remember if it was a UK or American code.
Regards, David |
10th Jun 2018, 12:28 pm | #31 |
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Re: A quiz, old time colour codes.
I always associate brown with 'balanced' heater-windings [centre-tap on transformer secondary connected to earth] and green for single-ended heaters (chassis return).
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10th Jun 2018, 7:26 pm | #32 | |
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Re: A quiz, old time colour codes.
Quote:
Spot on, brown is valve heaters with brown & yellow centre tap, green for rectifier heaters with green & yellow centre tap. But how many sets were wired strictly in accord with this code? That leaves the HT, the primary and screen and the Additional LT windings, carry on........ Then there are more to identify, starting with the colours for all the various battery leads 11 of those, and then on to the moving coil loud speaker leads, 10 of those believe it or not. Sam. |
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10th Jun 2018, 7:35 pm | #33 |
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Re: A quiz, old time colour codes.
When did Pink wires everywhere [or clear-jacketed-with-pink-sleeves-and-numbers] become the standard for UK Aviation/Military stuff?
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10th Jun 2018, 7:55 pm | #34 |
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Re: A quiz, old time colour codes.
My [ American] transformer-reference says:
Primary: Black [start], Black/Yellow [tap], Black/red [finish] Secondary: Yellow for rectifier filament [yellow/blue if it's center-tapped] Red for HT winding [Red/yellow for center-tap] Green for filament-winding 1 [green/yellow for center-tap] Brown for filament-winding 2 [brown/yellow for center-tap] Slate for filament winding 3 [slate/yellow for center-tap] For IFTs: Primary - Blue (plate) and Red (HT) Secondary: Green (grid or diode), Black (grid or diode return), Green/black for center-tap) Audio transformers: Primary - Blue (finish, plate) Red (start, B+) If center-tapped (push-pull) then the ends are blue and brown or blue, with red as the center-tap. For energised-field loudspeakers: Voice-coil: Black (start), Green (finish) Field: Black/Red (start), Yellow/red (finish), Slate/Red (tap, if any). Source: "Radio Servicing, Theory and Practice" by Abraham Marcus (1950). |
10th Jun 2018, 8:57 pm | #35 |
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Re: A quiz, old time colour codes.
Pink wire plus number and letter markers for military equipment was already in use when I joined Plessey in 1969.
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10th Jun 2018, 9:15 pm | #36 |
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Re: A quiz, old time colour codes.
Some variations there with my reference, from 1936, revised 1948.
My Cocking book gives, Transformer primary , black 0v, black & red is 230v tap, there is a also 10v, 210v &250v taps. Rectifier heaters are green with green & yellow centre tap. Additional LT winding blue with blue & yellow centre tap. I suppose slate may be considered blue. HT is the same, red with yellow & red centre tap. No listing for IF transformers. Audio transformer is red for HT connection. All the others are different. Energised speakers are totally different. We need another reference to compare with these two. I remember pink wiring from my apprentice days with printed Hellaman sleeves. |
11th Jun 2018, 5:32 am | #37 |
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Re: A quiz, old time colour codes.
Its not that "old time" as such, but may add to the knowledge base.
Its from " Audiocyclopedia by Howard M. Tremain. Copyright 1959 and 1969. |
11th Jun 2018, 12:16 pm | #38 |
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Re: A quiz, old time colour codes.
I am not sure how universal it is, but I have come across a number of mains transformers in HP equipment with 2 115V primary windings that are connected in parallel for 115V mains and in series for 230V mains.
The colour code is : Black --- Black/Yellow Black/Green -- Black/Red So for 115V, link black to black/green to one side of the mains ; black/yellow to black/red to the other side of the mains For 230V, link black/yellow to black/green; black to one side of the mains; black/red to the other side of the mains. |
11th Jun 2018, 1:38 pm | #39 |
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Re: A quiz, old time colour codes.
Does anyone have a link or a list of OLD mains wiring colour codes in different countries ?
We are all no doubt familiar with current UK colours and with the previous colours, which are still in widespread use, but what about longer ago? Black for earth "went out with the war" as did green for one phase of a three phase supply. White for neutral on 3 wire DC may never have been official but was used in premises that also had an AC supply. |
11th Jun 2018, 11:02 pm | #40 | |
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Re: A quiz, old time colour codes.
Quote:
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