Selex Transfers G.W.green and Sons, What The Heck is This Radio???
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Location: Golden Grove, SA
Member since 10 April 2015
Member #: 1726
Postcount: 149
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I just picked up this unit thinking it was a PA system.
Then opened it up and was surprised to find it was a radio system.
The only info I could find is "Selex Transfers G.W.green and Sons" on the Arts and P Sticker.
There are 3 speakers that link together, the first being an Electromagnetic speaker the others are Fixed.
So I have no idea what is meant to be for
Josh
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Location: Harston, VIC
Member since 28 February 2009
Member #: 442
Postcount: 145
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Hi Josh,
G W Green & Sons were the makers of the ARTS&P transfers.
There are several files on the net describing the reasons for the existance of these transfers and the their use in dating the age of some early radios.
Cheers, Graham...
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7402
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My guess is a very early car radio. The "E" on the transfer means 1938 as the year of manufacture. If it is a car radio it'd be a prime example of what luxury items went into cars of the time.
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A valve a day keeps the transistor away...
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6763
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Vibrator in lower right corner suggests a car radio.
Let us know the valve line-up.
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Location: Belrose, NSW
Member since 31 December 2015
Member #: 1844
Postcount: 2491
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That's an Astor car radio. I have one similar.
These were typically mounted on the firewall or even under the front seat, connected to dash controls with bowden cables.
Speaker is not ED although it looks like it, it will be PM.
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Location: Melbourne, VIC
Member since 20 September 2011
Member #: 1009
Postcount: 1211
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It is a car radio made by Astor.
Assuming the valves used are pre-octal types, models to look at are:
220/DA, 6376/EE (6V) , 6376F/FD (6V), 6376S/ED (6 & 12V) & 12376/FB (12V). Valve line up 78, 6A7, 78, 6B7S, 41 & 84. I.F. 173 kHz.
or
6386/HE (6V) & 12386/HF (12V) Valve line up 78, 6A7, 78, 75, 41 & 84. I.F. 173 kHz.
There should be a model designation stamped somewhere on the chassis.
Also, see this thread:
https://vintage-radio.com.au/default.asp?f=3&th=655
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Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5401
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Not quite identical to one I have here, and its a car radio. That tatty metal plate centre front of the case will be the Astor badge.
Marc
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Location: Golden Grove, SA
Member since 10 April 2015
Member #: 1726
Postcount: 149
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Looks like Astor it is, the line up is
6A7, 41, 75, 2 x 78 and reckon an 84 (not marked) with a 6v Vibrator
Josh
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Location: Belrose, NSW
Member since 31 December 2015
Member #: 1844
Postcount: 2491
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Hi Josh
Before connecting it to 6v, and unless it's a large mica part, replace the approx .01μF cap that's connected between the two rectifier plates. An OC cap will do a lot of damage (rectifier, socket, transformer) very quickly.
It needs to be a special high voltage, high current cap. You can often find one in a junked computer monitor.
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Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5401
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I often use Line caps on the vibrator side as they have a high punch through & should not short, padder & other caps tended to have an attrition rate due to the spikes. Any original caps should be treated with suspicion. Do not use capacitor start caps.
Do not change values on the vibrator side as it is actually a resonant circuit.
Marc
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Location: Belrose, NSW
Member since 31 December 2015
Member #: 1844
Postcount: 2491
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A line cap would not be a good choice because they are designed to go O/C easily if spiked for safety reasons. That's exactly what you don't want. Better to go S/C, less damage that way.
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Location: Wangaratta, VIC
Member since 21 February 2009
Member #: 438
Postcount: 5401
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The punch trough of "x/y" caps is quite high due to the spikes & transients you get on the mains & I had one incident recently where two of my design surge protectors actually did what they were supposed to do.
It must of been a decent surge, or lightning, as one part tripped out their circuits, circuit breakers, the other the RCD's, which is what they are, as noted, supposed to do.
I have seen the damage from some of the caps in those radio's shorting and it is avoidable.
Marc
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