Portable Tape Recorder TR50B

EMI; Hayes, Middlesex

  • Year
  • 1955 ?
  • Category
  • Sound/Video Recorder and/or Player
  • Radiomuseum.org ID
  • 236866

 Technical Specifications

  • Number of Tubes
  • 9
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Details
  • Tape Recorder
  • Power type and voltage
  • Alternating Current supply (AC) / 220-250 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 7 inch = 17.8 cm
  • Material
  • Leather / canvas / plastic - over other material
  • from Radiomuseum.org
  • Model: Portable Tape Recorder TR50B - EMI; Hayes, Middlesex
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Dimensions (WHD)
  • 458 x 336 x 430 mm / 18 x 13.2 x 16.9 inch
  • Notes
  • The tape winds on the take up spool oxide side out, so full track machine. There is a separate monitor head.

    Speed is 7.5 & 3.75 ips. Other models in the series will have different speeds.

    A switch on the rear selects the metering function.

    The internal loudspeaker has an on/off switch.

    Very similar to TR50 (lacking dial centre rear). There are a number of different superficially similar TR51 models.

    It is portable only in the sense of transportable at a time when similar tape recorders were large consoles. It's very heavy with two stout handles. When the lid is closed it resembles a "flight case".

    There are two main electronics chassis:

    PSU & Audio amp: DH77 (or 6AT6) N78 U50

    Record/Replay: This has EF40 x 2 and Z77  on a single anti-vibration mount with L77 EF91 N78  mounted directly.

    Removal from "Rexine" style covered Wooden "Flight Case".

    1. Un-hitch the lid retaining bar and place unit upside down on a foam mat or cushion.
    2. Remove rear panel (knob pulls off) and remove meter switch extension shaft.
    3. Undo 4 screws on base.
    4. Lift box/cabinet off the chassis.
  • Net weight (2.2 lb = 1 kg)
  • 29 kg / 63 lb 14 oz (63.877 lb)
  • Author
  • Model page created by Michael Watterson. See "Data change" for further contributors.

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