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G4EBT > OLDSET 08.01.04 01:48l 60 Lines 2180 Bytes #999 (0) @ WW
BID : A22306G4EBT
Read: DB0FHN GUEST
Subj: Oz Unidyne 1A repro valve RX?
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<GB7FCR
Sent: 040108/0044Z @:GB7FCR.#16.GBR.EU #:35209 [Blackpool] FBB-7.03a $:A22306G4
From: G4EBT@GB7FCR.#16.GBR.EU
To : OLDSET@WW
I have a local acquaintance in his 40's who was born and grew up in
Melbourne, but for seven years ago, for reasons best known to himself,
came to live in Beverley, East Yorkshire. (I only recently learned that
he's Australian - he has absolutely no trace of an Australian accent).
Anyway, that isn't the point of this bulletin. He has an intriguing
little one-vale radio, which at first sight looks like a pre war vintage
"breadboard style" radio. It's on a wooden box type base, about 9" x 6",
and about 2" high.
It has one four-pin pre-war Marconi valve, one fixed basket weave coil,
and two moving ones - one for tuning and one for reaction which can be
swung to and fro with levers across the fixed one.
There's a flying lead which can be plugged into one socket or another to
introduce an additional fixed capacity to expand the tuning range of the
coils.
It has one grid leak resistor mounted above the breadboard.
On closer examination, it has a small transformer, which is to enable low
resistance and well as high resistance 'phones to be used. It has a
battery holder for the heater voltage, and at first I was puzzled as to
where the HT supply was meant to come from.
I then noticed a row of four pairs of studs on the underside back skirt of
the wooden box, which I realised are actually M/F stud connectors for four
PP3 9V batteries in series to give 36V.
It was bought in Australia as a Christmas present in Melbourne back in the
early 1970's when he was a child, and is called "Unidyne 1A". There is no
maker's name on it, but he thinks it was Edison, or Edyson (Not
Eddystone!)
I've done a google trawl of the net, and come up with nothing.
I wonder if anyone has any info about this intriguing little set?
Although a reproduction, it's nevertheless at least 30 years old,
so well on the way to being "vintage"!
Any info would be greatly appreciated.
73 - David, G4EBT @ GB7FCR
Eddystone User Group Member
G-QRP Club Member No: 1339
QTH: Cottingham, East Yorkshire.
david@crofters89.freeserve.co.uk
Message timed: 00:42 on 2004-Jan-08
Message sent using WinPack-Telnet V6.70
(Registered).
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