yewdonia: Yewdonia Screened Grid 3

Via an acquaintance in the UK I was able to find some tentative information regarding the provenance of this set. According to Mr. Gerry Wells, a well-known historian who owns a fantastic radio museum in Dulwich, South London, it was made by one of the small makers under the Plessey umbrella. Its still unknown why it would have Austrian components under the chassis but the coil covers and tuning cap are definitely Plessey as per Mr. Wells.
Furthermore he and others are in agreement that the set is from 1934 given the station markings on the dial. It is suspected that the set was a 'store model' possibly for Gamage's in London.
Its a 3-tube regenerative (reactive) battery set with 3 stages of RF selectivity. Uses valves (tubes) VP2, SP2 and PM2A. This is a fairly common circuit seen in some other sets of the era. Tunes 2 bands, Medium Wave and Long Wave. Battery voltage is 90-135 volts for B+, 1.5 to 2.0 volts for the filaments, and a pair of grid voltages -4.5 and -9.0

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Dear Bill
Very nice that you add information to this interesting set. You named also the tubes in your post. Maybe you did not yet look up the different links on the model page?

You can put in the tubes directly to the model by using the link "Suggest change". Since the VP2 is a variable mu RF pentode I think 1934 is probably the earlyest date possible. Unfortunately I don't know (without research) when the British 7-pin-base has been introduced.
So after knowing more you might also change the year and the ?? to ? only. Thank you for bringing in a nice model.

Did you try the link "Personal Indox" for your model?
I fear that the many possibilities I have put in to this complex application is probably in vain (?).

I tried to really unite everything one needs to know or to do for a model on the model page, including the schematic. Therefore photos of the untouched chassis are wonderful - as you have shown it.

If the tubes bear good information one can click them and receives the schematic around the tube with the values, tha base connections, similar or same types - which again bring in data if missing on the one in the set etc. That's the reason why I try to get members enhancing models on the model page. The ultimate goal is also to have specific information via posting from the model to the forum as you have done it - for instance in form of repair reports. In this respect I think we really have a unique feature - which is not used so often as I hoped.

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Hi Ernst,
I found that particular information in an old text AFTER I had generated the manufacturer and submitted the model. I had forgotten that I had it and only found it when I was searching my fotos. My intention is to now add the tube info, etc.

I'm relatively new to making submissions to the site and didn't see a simple way to add this text information other than the "Suggest Change" procedure to get the text information under "notes" without it appearing in both the listing AND in this Forum. Now that I understand better the process I will do so accordingly in the future.

Oh no, the features are wasted in vain! However it does take some time for one who is not intimately familiar with the site to realize all the features which are available.

Thank you,

Bill

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Bill,

you certainly got the right man in Gerry Wells, he can tell
you the most obscure information at the drop of a hat!
Just to say that Austrian cap.'s and resistors were quite
common in some British sets in the early '30's, also, I
think, ISKRA? resistors. Oh, and the British 7 pin base
dates from 1933, I believe.
 Regards,
                John Turrill.

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Dear Bill

I just used a feature above of this thread: *** Please remind me ***
To remind me wether the tubes are now set for your nice Screened Grid 3 model of Yewdonia, GB.
It seems that you either did not have the time or I could not explain right.

I think it is easyer than you think: Please go to your models page, scroll down to the link bar and click "Suggest change".

Since somebody (Konrad Birkner) did already add a field you get first the "Changes History", glance over it and click "Suggest a change". Then you have the form of your set.

I recommend to newcomers of a page to click the blue info button for information. There you get good information about the page and to how and what to do. With "Ctrl-P" you can even print the information out.

Within the form you see the field names in the order of the model page to your left, followed by the content of the field and then by an empty filed where you can enter or select your data. Below you have the last field for internal use above the red GO-button. There you give a short reason for your entries (perhaps source or so).

Only now I see in your profile that you have already some experience in doing that - so I guess my explanations are in vain - well, for other members who hesitate to use our features ... ;-)
Thank you for your activity which you took up, perhaps quite recently. I hope I did not create RMorg to be too complicated or having too many features. Have you ever tried the link "Personal Index" on the model page? There is much more functionality to find within RMorg - but take your time. Any suggestion will be appreciated.

Cordially,
Ernest

 

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