Coronation Twin Deluxe R906

Ultra Electric Ltd.; London

  • Year
  • 1953/1954
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • ID
  • 72039
    • 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
  • Number of Transistors
  • Main principle
  • Superheterodyne (common); ZF/IF 471 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 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm
  • Material
  • Leather / canvas / plastic - over other material
  • from
  • Model: Coronation Twin Deluxe R906 - Ultra Electric Ltd.; London
  • Dimensions (WHD)
  • 305 x 216 x 165 mm / 12 x 8.5 x 6.5 inch
  • Notes
    V2 voltage is shown incorrectly it should be 85v not 8.5v

    De-luxe version of model R786, housed in a simulated crocodile or snake skin covered case with sliding front doors. It is not clear whether J.Hill refers to the model number R786 only or to its name "Coronation Twin".

    More than one colour-way. Cream or dark brown.

    If two plugs for  batteries:
    HT 85V = Ever Ready B129, LT 7.5V = Ever Ready AD39

    If single plug for batteries:

    Ever Ready B127 85V + 7.5V combo pack

    The two alternates are about the same volume. Both are used on various "Twin" models.


    (Coffret forme mallette, en bois gainé imitation reptile - cadran pouvant être masqué par caches coulissant)

 Collections | Museums | Literature


The model Coronation Twin Deluxe is part of the collections of the following members.


Forum contributions about this model: Ultra Electric Ltd.;: Coronation Twin Deluxe R906

Threads: 2 | Posts: 5

As I write we know of the following nine Ultra Twin Models.

These are all covered by one Trader (963) and R&TVS (1952 & 1957 editions Vol 1) entry:

  • Ultra Twin 50 R656 or Carnival Twin  (Separate 85.5V & 7.5V HT & LT batteries) Trader 963. A revised version of R586 with different case style.
  • Ultra Twin R568 (Trader Recommend 963 as "Similar)  R&TVS "Twin" is R568 or R656
  • Ultra Twin R586  Or Twin 50 (Single combo 85.5V & 7.5V B127 Battery pack, B127)  R&TVS 1952 calls this a Twin 50. Different style case to the rest, like mains R589 The Trader 963 refers to this as the earlier model
  • Ultra Carnival Twin R746 (Trader Recommend 963 as "Similar) R&TVS "Carnival Twin"

If two plugs for  batteries: HT 85V = Ever Ready B129, LT 7.5V = Ever Ready AD39

If single plug for batteries: Ever Ready B127 85V + 7.5V combo pack

Separately but still similar

Coronation Twin Deluxe R906 Offenbach 53 (leather)
  • Ultra Twin R825 Last twin and  using low consumption valves (Nominal 25mA rather than 50mA series)

VHF-FM Offenback Models vs AM only Ultra Twin.

While Germany had VHF-FM from 1949 and a variety of Stations not on AM due to Russian and Allied use of frequencies, the UK only had VHF-FM from 1955 with a very slow "rollout" starting in South East (to combat interference on MW BBC Third) and only simulcast of BBC Home, Light and Third till 1970s, with poor signal strength in 1950s, so no UK VHF-FM battery portable models other than 1957 Vidor "Vanguard" and 1958 Ever Ready "Sky Emperor" (BEREC "Commander"). There was only one 1955 Battery valve Table model (USA call them Farm Radios) the Ever Ready "Sky Monarch AM/FM". Ultra never made any Battery Valve VHF models. Ultra became part of Thorn  (BRC / Ferguson) and no more than a label by 1960s. 

Why Twin?

They are called "Twin" because of dual mains or battery operation. Some have a captive mains lead that is internally docked to switch to battery, others use a two pin plug with battery mains switch on chassis and removable mains lead with inline socket. As some models are very similar cabinet and the knob on wavechange switch can be lost exact identification can be difficult if the paper label on rear panel is missing. The slats on rear panel break easily. Loop aerial on rear. Some versions have an aerial socket. All are potentially live chassis on mains operation.

Ultra don't seem to be consistent on exact model name (Twin, Twin50, Carnival Twin) in adverts.

While the rear and main case appear to be Bakelite (except Coronation Twin Deluxe R906) the pale fromt panel may be some other material,

A similar styled mains only model is the R5897 (very similar to Twin R586 and Export Twin WR5897), the Troubadour U626 is more different but similar materials.

These models taking into account inflation and comparing wages would have cost more than an HDTV today and between one and two weeks wages in early 1950s.

Michael Watterson, 08.Mar.14

Weitere Posts (3) zu diesem Thema.

Is there really a difference between Ultra Coronation Twin DeLuxe & Ultra Coronation Twin known?


Model tube quantity shows 5 but uploaded schematic only shows 4 tubes!

For my part, the suffix "Deluxe" indicates the special cabinet covering only ?

Thanks for help!

Wolfgang Scheida, 14.Sep.10

Weitere Posts (2) zu diesem Thema.