New Old TRF Receivers

 This clean-looking set looks as if it might have been made just the other day and it's certainly been rewired; mainly with bare tinned copper, but all the components are authentic.

The front panel appears to be "Arborite" a fancy type of ebonite and the case is made of oak.

The brass screws look new and the set has the air it was made recently. Shall I whack with a bike chain and leave it out in the garden over the winter? That would transform it quickly into what would then appear to be the genuine article even if it wasn't already.

 Two valves are used , a Mullard PM2DX and a Mazda HL210. These are fitted into anti-microphonic 4-pin holders. The interstage transformer proclaims it was originally fitted in a Cossor Melody Maker. The tuning condenser is 0.0003uF Ormond and the reaction condenser a small air-spaced JB component. There's a Lissen RF choke, the same make of decoupling condenser and a cheap 2-waveband coilpack mounted on ebonite with an integral push-pull wavechange switch. A 5.6Mohm grid leak, micamould style condenser, a pair of ebonite terminal strips and a 4.5 volt modern bicycle lamp battery serving as a grid bias battery and push-pull on-off switch completes the round up of components.



 Another new old TRF Receiver?

 I don't quite know what to make of this pretty looking set!
Maybe I should just say it's a home built set from the late 20s
The chap I bought it from described it as "restored condition" and believes it to be a genuine early radio.
It certainly uses mostly period radio parts.
However I'm of the opinion it was built after WWII rather than before. Exactly when? Later rather than earlier I would say because this type of set would have been commonly available and scarcely worth the trouble duplicating.
There are a few mistakes in the woodworking.....
For a start, plywood is generally sold with a good side and a cheap side. For some strange reason the cheap side is on the outside as there is a join in the veneer on the outside. Perhaps the constructor thought the grain of the good side didn't look as good and overlooked the vertical line in favour of the figuring of the wood and I'm sure I've seen the beaded moulding, used for hiding screws securing the front panel, in B&Q.
Ignoring the piece of clear polythene choc block as an indisputable recent addition, the wiring is a mixture of varnished sleeved single BTC and the type of pink covered cable pre-dating modern plastic that was used to wire factories in the 40s and 50s.


 If you examine the following pictures you'll see there's a small moulded mica capacitor dating from war-time and an aluminium sheet under the RF stage. A new Z21 (left) and HL2 with an unmarked triode output valve (right), a "new" Ferranti inter-stage transformer, a pair of "Ormond" slow motion drives and a variety of other bits and pieces can be seen under the hinged lid. That choc block is certainly quite modern.


 Another view, towards the rear, shows genuine vintage parts.


 The rear panel is made from hardboard roughly drilled with lots of holes, although most early setmakers didn't bother fitting a rear panel and access was generally left for batteries which would have been an HT battery plus a 2-volt accumulator.


 Below, a rather fine example of a "Silver Ghost" permanent magnet dynamic loudspeaker made by "Lamplugh Radio" of Coventry which has been re-coned. The speaker is fitted to a solid wooden baffle board held to the rear of a hinged door in the lower part of the cabinet by clips.


 It looks like the set's batteries were fitted in the space behind the loudspeaker, but where did the case come from?
Is it entirely home made or was it once a china display cabinet or is it, in fact a genuine early radio?
However having said all this..
It will be interesting to hear what it sounds like as everything seems to be present to enable me to get it going.
I would be interested though to hear from anyone that could shed some light on it's origin whether it be 1928, 1930 or 1989.
As a future cottage industry it would have been a dead loss as the value of the components in the set is much more than I paid for it!

In case you wondered about the loudspeaker's manufacturer, read the rather sad but common notice from the 1930s.


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