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Ultra Twin 50 R568

Ultra Twin 50 R568; Ultra Electric Ltd.; (ID = 2277377) Radio
 
Ultra Twin 50 R568; Ultra Electric Ltd.; (ID = 2277379) Radio
 
Ultra Twin 50 R568; Ultra Electric Ltd.; (ID = 547470) Radio
 
Ultra Twin 50 R568; Ultra Electric Ltd.; (ID = 547471) Radio
 
Ultra Twin 50 R568; Ultra Electric Ltd.; (ID = 1217248) Radio
 
Ultra Twin 50 R568; Ultra Electric Ltd.; (ID = 1217249) Radio
Ultra Twin 50 R568; Ultra Electric Ltd.; (ID = 1276303) Radio
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Ultra Twin 50 R568; Ultra Electric Ltd.; (ID = 1276303) Radio
Ultra Electric Ltd.;: Ultra Twin 50 R568 [Radio] ID = 1276303 518x736
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For model Ultra Twin 50 R568, Ultra Electric Ltd.; London:
Contemporary newspaper advertising
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Ultra Electric Ltd.; London
alternative name
 
Ultra Radio and Television
Year: 1950 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 4: 1C1 1F3 1FD9 1P11
Main principle Superheterodyne (common); ZF/IF 470 kHz; 2 AF stage(s)
Tuned circuits 6 AM circuit(s)
Wave bands Broadcast (MW) and Long Wave.
Details
Power type and voltage Line / Batteries (any type) / 200-250 / 7.5 & 85.5 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm
Power out
from Radiomuseum.org Model: Ultra Twin 50 R568 - Ultra Electric Ltd.; London
Material Bakelite or Plastics (type unknown)
Shape Portable set > 8 inch (also usable without mains)
Notes

Second model in the "Twin" range.
A lever on a spring loaded slide switch locks the radio in the "battery" mode when the mains plug is parked in a holder. This was to suit a UK 5A two pin and some smaller 5A 3 pin prior to the 3 rectangular pin system adopted in the late 1950s. The chassis is also connected directly to one wire of the mains cable when in "mains" mode (default) and power switch on. Today the set is best operated via an external isolation transformer or on batteries.
There is an external aerial socket isolated by a Silver Mica capacitor.

This Twin 50 uses a combined battery. Presumed to be B127 (size & rating and claimed by Trader 963),  If the radio has two plugs, then it's the Carnival Twin R656 or some other Twin as  R&TS states these  use separate batteries (Presume B129 and AD39 as claimed by trader 963 for Twin 50)

 

Price in first year of sale 13.00 GBP
Source of data -- Original-techn. papers.
Circuit diagram reference Radio and TV Servicing books (R&TVS) book
Literature/Schematics (1) Trader Sheet 963.

Model page created by Peter Hoddow. See "Data change" for further contributors.



All listed radios etc. from Ultra Electric Ltd.; London
Here you find 220 models, 131 with images and 149 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


 


Forum contributions about this model
Ultra Electric Ltd.;: Ultra Twin 50 R568
Threads: 1 | Posts: 2
Hits: 1729     Replies: 1
ultra: R568; Ultra Twin 50
Michael Watterson
19.Jul.12
  1

A puzzling aspect is the battery type. The B129 + AD39 use the 3 pin and larger 2 pin HT & LT connector (same as B126 and AD38) and that is what is on my Twin 50, with dabs of red marker on the solder, as on the internal solder joints of the set, suggesting a factory fitting.

But the B127 "combo" pack uses a 8 way + key socket  with keyed 4  pin + dummy key pin connector of "type W"

 

B129 + AD30 side by side is about 286 x 57 x 96mm max

B127 280 x 95 x 55 mm approx

The Public may have been suspicious of "balanced" combi packs and preferred the separate HT & LT?

Michael Watterson
20.Jul.12
  2

I made up a box according to known dimensions as "chocolate box" style. I think it can take 5 off 10 x AA holders plus 6 AA = approximately 85V and have space for 5 x F cells (taken from PJ996 lantern packs), or 5 x Alkaline D cells.

 

 

 (cells require insulation before series wiring for 7.5V nominal)

The box does fit in the Ultra Twin 50 compartment.

 

 
Ultra Electric Ltd.;: Ultra Twin 50 R568
End of forum contributions about this model

  
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