Ultra Twin 50 R568

Ultra Electric Ltd.; London

Data
Forum
Pictures
Collections

  • Year
  • 1950
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 101821
    • alternative name: Ultra Radio and Television

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 4
  • 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.
  • 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
  • Material
  • Bakelite or Plastics (type unknown)
  • from Radiomuseum.org
  • Model: Ultra Twin 50 R568 - Ultra Electric Ltd.; London
  • 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.
  • Author
  • Model page created by Peter Hoddow. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum

Forum contributions about this model: Ultra Electric Ltd.;: Ultra Twin 50 R568

Threads: 1 | Posts: 2

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, 19.Jul.12

Weitere Posts (2) zu diesem Thema.