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515P

515P; Sobell Ind., Slough (ID = 555605) Radio
 
515P; Sobell Ind., Slough (ID = 555606) Radio
 
515P; Sobell Ind., Slough (ID = 1027113) Radio
 
515P; Sobell Ind., Slough (ID = 1027114) Radio
 
515P; Sobell Ind., Slough (ID = 1027115) Radio
 
515P; Sobell Ind., Slough (ID = 1027116) Radio
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515P; Sobell Ind., Slough (ID = 555605) Radio
Select picture or schematic to display from thumbnails on the right and click for download.
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Sobell Ind., Slough
Year: 1954 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 5: ECH81 EAF42 EBC41 EL84 EZ80
Main principle Superheterodyne (common); ZF/IF 470 kHz
Wave bands Broadcast, Long Wave and Short Wave.
Details
Power type and voltage Alternating Current supply (AC) / 200-250 Volt
Loudspeaker Permanent or electro-dynamic (moving coil), system not known yet.
Power out
from Radiomuseum.org Model: 515P - Sobell Ind., Slough
Material Bakelite case
Shape Tablemodel, low profile (big size).
Dimensions (WHD) 16 x 11.5 x 7 inch / 406 x 292 x 178 mm
Notes identical to H.M.V.1360.
Source of data Radio! Radio!

Model page created by Konrad Birkner † 12.08.2014. See "Data change" for further contributors.



All listed radios etc. from Sobell Ind., Slough
Here you find 111 models, 51 with images and 89 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


 


Forum contributions about this model
Sobell Ind., Slough: 515P
Threads: 2 | Posts: 6
Hits: 705     Replies: 2
sobell: Sobell 515 still struggling
David MacFarlane
26.Jan.19
  1

Still not terribly sure if I am doing this the right way according to forum rules, but I got the chance to spend some time with my Sobell 515P, and all of the data sheets I can find indicate that V2 is an EAF42. On my set V2 is an EF89.

This is an 8 pin base, and pulling up the comparison, I find the whole pin out to be different, and the original diagram shows L13 to be mounted on the back of the chassis.

I am wondering if there has been a lot of surgery on this model long ago (for none of it looks disturbed), or if indeed, it is a different circuit which has been employed, perhaps in order to allow the EF89 rather than the original EAF42.

The characteristics are similar, but not identical, and pin 6 is certainly not the grid on the EF89.

Any hints please?

Rolf Beckers
29.Jan.19
  2

Dear David,

It's quite normal that in the early fifties (e.g. 1952 to 1955) the tubes were changed from the 40-series (Rimlock) to the 80-series tubes (Noval).This happens at many other ratios from that period too. Smaller manufactures did this without changing their service documentation.

Regards

Rolf Beckers

David MacFarlane
29.Jan.19
  3

Thank you again Rolf, now its making sense - I just found I had to go and do lots of homework with pin outs and grids, and I am getting closer to my teenage level of competency (1963), all the old data is coming back slowly from the memory banks as I renew a once keen hobby - that's the trouble with careers, they can carry you off on a huge tangent from where you intended to go, and one finally ends up in management - nothing like one's original intent.

I'm getting there, from Biasing my Marshall amp's output pairs to re - aligning the IF on this Sobell - strange sort of pleasure feeling, doing what you want!

Wonderful site and forum - thanks again.

Dave.

 
Hits: 355     Replies: 2
sobell: Sobell 515p valve line up - incorrect?
David MacFarlane
15.Dec.18
  1

Hi, I'm new to Rmorg, and not terribly sure if I am entering in the corresct fashion, nor indeed if anyone might get to see this, - fantastic and complex as the org is, but here goes -

I acquired a Sobell 515p some time ago, and have had difficulty in receiving stations on sw, mw or lw.

I tried adjusting the If's an tuning coils ever so slightly, bringing them back to where they were when I got no result.

I was about to inject signals as per textbook instruction, when I noticed that the valves seemed to be very different from the book diagrams.

The book says V1 to V5 respectively, are ECH81, EF41, EBC41, EL84 AND EZ40.

The line up in this old set is as follows - ECH81, EF89, EL84, EBF80 AND EZ80, Again, respectively V1 to V5.

I am not even sure that EL84 is in the right order, although in one of the sketches, V3 and V4 seemed to change places, which would allow EL94 to be correct.

The rest of the valves do not seem to figure, since EF41 and EBC41 are different bases.

I cannot see the similarity between EF89 and EF41, unless the bases have been swapped, but there is no evidence of this, and it seems an unlikely candidate. Can anyone help?

Dave.

Rolf Beckers
16.Dec.18
  2

Dear David,

I think there are a few discrepancies here. According to the documents we have at RMorg the valve line-up is: ECH81 EAF42 EBC41 EL84 EZ80. You mentioned your book says EF 41 instead of the  EAF 42. Does it mean you have a different book or documentation then what is shown on RMorg? In all the schematics at RMorg the valves 3 and 4 are always at the same position. Where do you see a different sequence?  You say the line-up at your set is ECH81, EF89, EL84, EBF80 AND EZ80. Is this counting according to the old valve placement? Or are there stamps or labels at the chassis showing this sequence? Anyway, if the EBF89 sits at the position of the EL84 the radio wouldn’t work at all.

In general: at the early 50s the radio manufactures changed from the 40 valve series to the 80 series. Smaller manufacturers did this even in-between the same model.

Regards,

Rolf

David MacFarlane
16.Dec.18
  3

Thank you Rolf, that was a quick reply!

I had a further check on the diagrams I downloaded, and indeed, I was at an antique store in Perth (Scotland) when I picked up the original Molloy/Poole R & TV Servicing, where I found the same diagram.

I admit, after I wrote, I was further examining, and I looked at one of the chassis layouts (Not the p version of the 515), and V3 was in the back, and I had taken it to be the front.

This means the line up is V1 - ECH81, V2 - EF89, V3 - EBF80, V4 - EL84, and V5 - EZ80.

There are no stamps or labels, I think this has maybe been quite a cheap model, in a bakelite cabinet.

The discrepancies seem to be V2 and V3, and I could not decipher whether these were good replacements. This was the valve line up which came with the set, and I wonder if this is what is knocking it out.

I am about to string a capacitor onto the grid to inject a signal, and have a look with the scope, but wanted to make certain this old set hadn't been tampered with and increased its fault.

Thank you for your help thus far - it leaves me very excited about the forum - feel part of something big with common interests - Picked up an old Murphy 122M at the same antique place! Renewed the mains lead and it works beautifully!.

Dave.

 
Sobell Ind., Slough: 515P
End of forum contributions about this model

  
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