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SPHERE TYPE 75

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Front View [34K]

  • Early 1949
  • 2 Valves (6J5GT plus 6X5GT recifier)
  • A.C. Mains
  • Original cost £13 2s 0d
NOTES
Closeup of tuning scale [13K]
Close-up of scale.
Click for larger picture [118K]
Advertisment from the April 1950
edition of Practical Television magazine.
Link to larger view [ 118K].
A simple litle signal generator from a company I've not heard of before, "Sphere Instruments", who were based in West Bromwich only a few miles from where I live.

This is q fairly early TV signal generator, having scale markings only for the first two BBC channels (London and Birmingham). Seperate 'V' and 'S' markers indicate the vision and sound frequencies.
SERVICE DATA Nope .. but there isn't much there to service !
CURRENT STATE Has been somewhere so damp that even the rubber feet appear to have rusted ! Seriously ! Though the case seems to be made of painted stainless steel as this has resisted rust well.
WHERE FOUND A donation to the cause from Cyril.
Box within a box! [5K]   Chassis view [17K]6J5 Valve6X5GT HT Rectifier
Open up the case and you find ... another box !   Not particularly compact ... are you sure it reaches ~50MHz ?

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J.Evans 2001-2003
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Last updated
13th July 2003