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Wartime Civilian Radio Receiver.

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Till Eulenspiegel
(@till)
Famed V-Ratter Registered

Hi Lloyd,   The set I'm working on is a U20 model which I believe was made by McMichael.   One part of the circuit which might invite comment is the detector stage.  A Westector diode is employed which requires a forward bias in order it can work properly. This is obtained from the output valve's bias resistor.

Till Eulenspiegel.

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Topic starter Posted : 17/01/2021 8:42 pm
Till Eulenspiegel
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Westector diode.

Westector
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Topic starter Posted : 20/01/2021 11:41 am
Cathovisor
(@cathovisor)
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@till

The set is much cleverer than just using a Westector - there's also stuff going on with the suppressor grid of the EF39.

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Posted : 20/01/2021 12:07 pm
Lloyd
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Mine has arrived! Quite a weighty little thing, all looks in good order, bit of water damage to the case, but still feels solid. I really want to get stuck in, but I’m just soooo tired! Have been all week, so I might have to wait to see what’s inside it.

F71EE3E3 4B57 4F6C A819 3859041A6809

regards

Lloyd

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Posted : 22/01/2021 3:11 pm
Till Eulenspiegel
(@till)
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The fabric on the loudspeaker baffle has a Murphy look about, there's a similar cloth on the A58V TV set.  If it's a Murphy it will have U7 on the chassis.   Reckon you've got a good set there.

Till Eulenspiegel.

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Topic starter Posted : 22/01/2021 8:20 pm
Till Eulenspiegel
(@till)
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Hi Lloyd, brightened your picture and now I'm sure it's a Murphy.

Wartime Civilian Radio Receiver U7

Till Eulenspiegel.

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Topic starter Posted : 22/01/2021 9:33 pm
Cathovisor
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Murphy knobs, Murphy grille cloth, if we see a picture of the inside I'll wager the IFTs are Murphy too.

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Posted : 22/01/2021 9:43 pm
Lloyd
(@lloyd)
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Indeed it is a Murphy, there’s a U7 stamped right next to the serial number. It also has a blue painted chassis too. I took the back off for the first time today, I was expecting it to have been messed about, due to the modern white 3 core mains lead, but it actually looks like it’s not been tinkered with beyond the mains lead, still a wax cap on the output TX, and it was full of cob webs! I gave it a quick vacuuming before putting the back on, it’s going to need a more powerful clean than the mini dyson can do, those cob webs are well stuck! There’s a bit of hard rubber wiring in there, so that’s going to need replacing.

 Regards

Lloyd

CC2E699C 2474 49A1 9471 69D7AF03E044
D16AF11A 2310 4775 853E A90A340CE1E9
00C42E22 AAF6 4826 9A6A 60D0F5F96832
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Posted : 23/01/2021 3:10 pm
Cathovisor
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I am distinctly unimpressed with how the mains earth has been terminated.

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Posted : 23/01/2021 8:07 pm
Lloyd
(@lloyd)
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It does leave a little to be desired doesn't it! I will be removing the mains lead and replacing it with something nicer, I'll find somewhere else to terminate it, preferably with a solder tag!

Regards,

Lloyd

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Posted : 23/01/2021 8:24 pm
Till Eulenspiegel
(@till)
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Not to forget the wartime utility radio receiver was designed by Dr. G. D. Reynolds of Murphy Radio Ltd.

I've ordered twenty maple wood strips, two will be used on the repro cabinet to create the detailing each side of the front panel.

Wood strips
Wartime Civilian Receiver detail

 The other eighteen?  These will be used to make the slatted loudspeaker grill in the Decca 101 recreation project.

Decca 101 Console Receiver3.pdf (2)

Till Eulenspiegel.

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Topic starter Posted : 24/01/2021 4:21 pm
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Boater Sam
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Nice wood to work with Maple, I've used quite a bit over the years.

Boater Sam
BVWS Member

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Posted : 24/01/2021 4:52 pm
Till Eulenspiegel
(@till)
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Posted by: @boater-sam

Nice wood to work with Maple, I've used quite a bit over the years.

It sure is.  That's the tricky part of the job done, making the three grooves in the wood strips. The next stage make those rounded edges.  Took no chances with this task, an extra fence to guide the wood strip through the saw bench.

DSC 0502
DSC 0501

 Till Eulenspiegel.

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Topic starter Posted : 27/01/2021 12:00 pm
jcdaze and Nuvistor liked
Till Eulenspiegel
(@till)
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The edges of the wood strips have been rounded off by using the router tool.  The strips in front of the parts being worked on are there to prevent the routing tool rocking during the cutting process.

DSC 0503

 Till Eulenspiegel.

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Topic starter Posted : 27/01/2021 5:46 pm
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Till Eulenspiegel
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Today, the wood trim strips were glued and clamped into position. Leave it for a few days to allow the PVA glue to set.  It's still not very warm in the workshop.

Wartime Civilian Receiver 24

 Till Eulenspiegel.

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Topic starter Posted : 30/01/2021 5:34 pm
Till Eulenspiegel
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It's beginning to look like a wartime utility radio receiver.

Wartime Civilian Receiver 25

 But the job isn't finished yet. There's the loudspeaker baffle assembly to finish off and the cabinet feet to make.

Till Eulenspiegel.

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Topic starter Posted : 31/01/2021 10:48 pm
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Till Eulenspiegel
(@till)
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The set was made by McMichael so the replica cabinet should be made as close as possible to resemble the original.  To that end the fabric shown in the second attachment is as close as one can find to the original material used by the manufacturer. The set is the model 382, I think.

Wartime Civilian Receiver 26

Wartime Civilian Receiver 27

Till Eulenspiegel.

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Topic starter Posted : 05/02/2021 5:28 pm
Cathovisor
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@till

Looks more like a 380: the 382 is the huge motor-tuned set they built.

https://www.radiomuseum.org/r/mcmichael_380.html

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Posted : 05/02/2021 6:48 pm
Till Eulenspiegel
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It is indeed a 380. I started a thread about the set on the UKVRRR at the end of last year.  Its been put aside in order to concentrate on the Baird T5 restoration.

Till Eulenspiegel.

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Topic starter Posted : 05/02/2021 7:16 pm
Till Eulenspiegel
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The loudspeaker baffle assembly was completed yesterday, but rest assured there is still a few more tasks to do before the cabinet construction can be signed off.

Wartime Civilian Receiver Loudspeaker Baffle 1
Wartime Civilian Receiver Loudspeaker Baffle 2

Till Eulenspiegel.

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Topic starter Posted : 13/02/2021 12:09 pm
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