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Post by elorens on Mar 28, 2024 18:57:23 GMT 12
I’m sorting valves, and found this one, a Philco 1Y1 on a UX4 base. The glass is frosted as in a pearl light bulb, or perhaps it has had a nasty accident. It seems to be in its original carton. I am having difficulty finding any data on it: it does not appear in my Wireless World valve data book, nor is it listed on the Valve Museum site. Can anyone provide any information, please? Thanks, Lawrence —   |
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Post by elorens on Mar 28, 2024 19:01:24 GMT 12
Measures 2.7 ohms between the two fat pins.
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Post by Bob Killip on Mar 28, 2024 19:21:25 GMT 12
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Post by Peter Walsham on Mar 28, 2024 21:16:38 GMT 12
Have a look at this. As Bob suggests, it is a current regulator valve, something akin to the Barretter's that were often used in British radios, wired in series with the valve heaters and possibly the AC supply to the rectifier valve as well, using an iron 'filament' in hydrogen gas to provide a positive temperature coefficient current stabilisation so the valves would receive their full heater voltage over fluctuating AC mains voltages. Although it appears as though the 1Y1 was probably used in battery receivers due to its 1 volt rating. See: www.radiomuseum.org/tubes/tube_1y1.htmlfrank.pocnet.net/sheets/201/1/1Y1.pdfPeter |
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Post by elorens on Mar 28, 2024 21:17:02 GMT 12
Thanks very much for this, Bob, that’s very helpful. Are you aware of any radio circuits using a tube like this? Would it typically be in series with the heater chain in an ac/dc set? Cheers, Lawrence |
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Post by elorens on Mar 28, 2024 21:30:32 GMT 12
Have a look at this. As Bob suggests, it is a current regulator valve, something akin to the Barretter's that were often used in British radios, wired in series with the valve heaters and possibly the AC supply to the rectifier valve as well, using an iron 'filament' in hydrogen gas to provide a positive temperature coefficient current stabilisation so the valves would receive their full heater voltage over fluctuating AC mains voltages. Although it appears as though the 1Y1 was probably used in battery receivers due to its 1 volt rating. See: www.radiomuseum.org/tubes/tube_1y1.htmlfrank.pocnet.net/sheets/201/1/1Y1.pdfPeter Great, thanks, Peter. Good to see the RadioMuseum entry. So it seems to be a constant current device, for controlling valve filament supply. For battery sets, I guess it could offset the effects of fading battery voltage? Do you know of any battery sets where filaments were in series? Would be great to see a circuit featuring one of these! |
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Post by Peter Walsham on Mar 29, 2024 9:05:32 GMT 12
Good morning Lawrence
I know of a lot of battery sets where the filaments were wired in series but, unfortunately, I have not come across any sets that have a valve, such as this, in them. You have got, what I would consider, a rather rare valve there.
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Post by Philconut on Mar 29, 2024 11:07:24 GMT 12
I have a Philco model 34A battery set which uses a 1C1 ballast tube. The set is still awaiting restoration so I don't have any "hands-on" data yet. According to Radio Museum, it was only used in 3 models although the 34A is not among those listed. All the listed ones are Philco.
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Steve
Society Members
vintageradio.co.nz
Posts: 732
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Post by Steve on Mar 29, 2024 15:41:12 GMT 12
Hi Lawrence, have you asked on the Philco Phorum? Someone might have seen one before - but it's quite telling that RadioMuseum doesn't have any models listed using that valve...
Cheers, Steve
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Post by elorens on Apr 3, 2024 16:49:32 GMT 12
Hi Lawrence, have you asked on the Philco Phorum? Someone might have seen one before - but it's quite telling that RadioMuseum doesn't have any models listed using that valve... Cheers, Steve Thanks, Steve - I am in the process of joining the Phorum. L |
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