Unknown white radio
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Location: Hill Top, NSW
Member since 18 September 2015
Member #: 1801
Postcount: 2116
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This week's unknown radio is a white one, exactly the same size as my little Airzone. The dial is vertical on the right hand side, and there's 2 knobs underneath.
Valves: 6SA7GT, VR-91, 6BV7, 6X4.
ARTS&P sticker: faded green, #698208
For a 4-valve set it works very well indeed, the 6BV7 is certainly a high gain output stage producing plenty of volume.
I've dug out the CD for my Nokia phone, and from next week I'll be able to take photos.
But for now, can anyone identify this radio from the information given?
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Location: Sydney, NSW
Member since 28 January 2011
Member #: 823
Postcount: 6802
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Can't find anything in the usual places with that line-up, even when substituting EF50 for VR91.
Closest I come is Titan/KGH who seemed particularly fond of the EF50.
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Location: Hill Top, NSW
Member since 18 September 2015
Member #: 1801
Postcount: 2116
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It's certainly a mystery radio.
The power cord has an inline power switch (an ancient slide type), but no idea if that was original.
I do need to update the electros as some hum was noticed yesterday.
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7451
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These radios were fitted with many different badges. Airzone, Howard, Elizabeth and Aristone were some of the brand names. Some were even made with no name at all. All those I've seen were made after 1950 and are fitted with baseless valves, though I notice yours has a mixture, indicating perhaps being made in 1950 where mixing of types to get rid of old stocks of octal valves was commonplace. The one I own is a no namer.
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A valve a day keeps the transistor away...
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Administrator
Location: Naremburn, NSW
Member since 15 November 2005
Member #: 1
Postcount: 7451
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Here's an Aristone version of this radio:-
http://www.ebay.com.au/itm/302004257346
I should mention that I have also seen this model with a Peal badge.
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A valve a day keeps the transistor away...
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Location: Belrose, NSW
Member since 31 December 2015
Member #: 1844
Postcount: 2527
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Definitely KGH. They made several variations on this design depending on what parts they could buy the cheapest!
There was this shop I used to repair radios for when I was a kid. It was at Canley Heights (Western Electrics - he also owned the picture theatre!). He always had one of these new in the shop window. Until the Philips MT3 came along they were the cheapest radio you could buy. Recommended when anyone dropped in a radio for a repair that would have been uneconomical. Cheaper to buy a new one! He sold lots of them. That guy (can't think of his name) was one of the laziest persons I ever met!
As I recall the lineup in the KGH was Converter feeding (I think) regenerative IF/detector via a single IF transformer. No AGC. Yes they had plenty of gain but you had to adjust the volume between stations and whenever the fridge cycled on or off! Just like the Philips MT3. Cheap, nasty but so simple there was nothing to break down!
Now the Philips MT3 is an interesting design. A 3 transistor "battery mantle" radio. OC169/AF116 converter, same transistor type as a reflexed IF and audio amp with the gain control in the RF path, followed by an OC72/OC74 transformer-coupled Class A output stage. The Class A output stage ensured that you were a regular customer for 276P 9 volt batteries, so Philips marketed a battery eliminator (that cost nearly as much as the original radio!) which would fit in place of the battery.
If you've got one of these and it chews batteries, replace the output stage with a BC327. No more thermal runaway and it works just fine biassed a little further down the curve.
Absolutely nothing you can do about the scratchy volume pot. They were like that new, straight out of the box!
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