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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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26th May 2018, 7:36 pm | #1 |
Pentode
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Small valve radio. Identified as an Empire MS-300.
anyone got any info , year etc on this
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26th May 2018, 7:37 pm | #2 |
Dekatron
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Re: small valve radio
MW-only, and mention of an "A"-battery makes me think it's a US-market product.
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26th May 2018, 8:44 pm | #3 |
Dekatron
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Re: Small valve radio
USA mfr, likely mid 1950s. Transistorised models were widespread in the States by the 1960s.
Does it have a printed circuit board or is it, as it looks, on a chassis?
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Al |
26th May 2018, 10:16 pm | #4 |
Heptode
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Re: Small valve radio
Japanese according to this https://www.***********/photos/transi...os/22106921184 - I used to have a couple of the Excel versions mentioned on that page but sold them a few years ago.
Alvin |
26th May 2018, 10:51 pm | #5 |
Heptode
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Re: Small valve radio
Trawling through old back ups I just found some pics of one of my long gone Excels and it's definitely Japanese.
Alvin |
27th May 2018, 9:43 am | #6 |
Dekatron
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Re: Small valve radio
Nice one Alvin it's even got the schematic, lovely little radio. Mick.
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27th May 2018, 10:00 am | #7 |
Dekatron
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Re: Small valve radio
It is a lovely little radio, quite taken with it. Presume the battery life would not be very long but it’s very portable and it’s 4 valves so should work well.
Cannot quite see but it looks like a socket for an external HT battery.
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Frank |
27th May 2018, 11:06 am | #8 |
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Re: Small valve radio
Japanese radios of the 50s do have very American styling. The obvious giveaway if you can look inside is that they will use Japanese valves.
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27th May 2018, 5:51 pm | #9 | |
Heptode
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Re: Small valve radio
Quote:
According to the schematic, it looks like inserting the phone plug disconnects the output valve filament increasing LT cell life. Most of those things were scrapped in the US, as the cost of operation was too high. |
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27th May 2018, 8:32 pm | #10 |
Dekatron
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Re: Small valve radio. Identified as an Excel.
Definitely not British! In early British terminology, the "A" supply referred to the high tension supply (A = Anodes) and the "B" supply was low tension (B = Battery). These designations were replaced by "HT" and "LT" to reduce confusion between local and imported circuits.
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27th May 2018, 8:40 pm | #11 |
Dekatron
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Re: Small valve radio. Identified as an Empire MS-300.
I can see the switch now, it must be an electrolytic across the B battery.
Is it possible for a clear scan of the label in the back of the set? Yes running costs must have been high.
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Frank |
27th May 2018, 9:07 pm | #12 |
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Re: Small valve radio. Identified as an Empire MS-300.
Looks like a 470 ohm bias resistor for the 3S4 and possibly either a 2.2 or 3.3meg grid return resistor.
Lawrence. |
28th May 2018, 3:32 am | #13 | |
Heptode
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Re: Small valve radio. Identified as an Empire MS-300.
Quote:
Solid state diodes, the negative is the anode and the positive end is the cathode, which is proper! |
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28th May 2018, 9:07 am | #14 |
Heptode
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Re: Small valve radio. Identified as an Empire MS-300.
I see the thread title has been modified with "Identified as an Excel" added to it but that's not correct as it's an Empire MS-300 - you can clearly see the words Empire and Empire Radio in the OP's pic.
The link about an Empire MS-300 I pointed to in post #4 says "Can also be found under the Excel name with the model number XL-1." and the pics I posted are of the Excel branded version I used to own. Alvin |
28th May 2018, 9:17 am | #15 |
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Re: Small valve radio. Identified as an Empire MS-300.
Corrected.
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28th May 2018, 9:23 am | #16 | |
Heptode
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Re: Small valve radio. Identified as an Empire MS-300.
Quote:
Alvin |
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28th May 2018, 10:03 am | #17 |
Dekatron
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Re: Small valve radio. Identified as an Empire MS-300.
Thanks for the scan, yes it does help, it does show how few components can make a working commercially built radio.
I will have a proper look at the diagram later.
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Frank |
28th May 2018, 8:43 pm | #18 |
Pentode
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Re: Small valve radio. Identified as an Empire MS-300.
Thanks for all your knowledge guys, wonder what a 67-5v battery looked like is not much bigger than an AA. Bob
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28th May 2018, 9:17 pm | #19 |
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Re: Small valve radio. Identified as an Empire MS-300.
67.5 volt batteries were made in different capacities but that one looks very small.
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Frank |
30th May 2018, 10:23 am | #20 | |
Heptode
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Re: Small valve radio. Identified as an Empire MS-300.
Quote:
I never came across a rechargeable 67.5 battery but I guess they must have existed..... Alvin |
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