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MULLARD H.T. SUPPLY

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Exterior View [30K] Tuning Tone On-off and volume Waveband

  • Late 20's / Early 30's ?
  • Mains supply for battery powered radios.
  • 1 Valve (currently a UU3 by Mazda ... can't be right)
  • A.C. Mains
  • Original cost unknown
NOTES Attached Lable [22K]I've no idea of the actual date of this unit, I can only guess.

This unit is designed to replace the H.T. battery of a battery reciever, though if you needed this unit you'd also need another unit to power the valve heaters so I wonder why this was not also built into the unit.

Early battery sets would also require a "grid bias" battery although the very low current required would probably make replacement by a mains power supply uneconomic.

Note the warning at the bottom of the illustrated lable. With the power supply unloaded the H.T. outputs would might well rise by over 100 volts which could be too much for the unit's smoothing caps or at least cause damage to any reciever that was subsequently connected.
SERVICE DATA Nope.
CURRENT STATE Apparently working, not that I have anything to test it with.

WHERE FOUND

 B.V.W.S July 2002 Wotton Bassett bash for £18.

Pair of 42's in push-pullMains Transformer6A7 Valve6D6 Valve75 Valve76 ValveType 80 rectifier valveTuning indicator (unclipped!) Interior View [16K]
MX40 Valve VMP4G Valve DN41 Valve U12

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THE PRE-WWII RADIO GALLERY		 Last updated
27th July 2002