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RADIO BROADCAST ADVERTISER
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A C Operated ( ^^gffiPd ) One Switch OnhPl)
teries have been required to supply the heavy filament drain.
The Power Compact, however, not only supplies B-voltage, but also provides for the filament heating and grid bias of the power tube. The Power Compact makes it possible to use power amplification even on sets designed for dry battery operation.
The Clarostat — a universal variable resis
tance capable of high current-carrying capacity — regulates at will the voltage on the R. F. and detector tubes. This gives you a decided advantage in controlling the sensitivity and clarity of your receiver.
Special Tobe "B" Block contains high-voltage short path type condensers, suitable for working voltage up to 400-volts D. C. At no time during the operation of the Hi-Q Receiver will the voltage ever exceed 400-volts.
Power and Speaker Units in One Cabinet
A NOTHER big advantage of this New * Power Compact is that it takes little room and can be installed in cabinet together with your loud speaker, "A" battery and trickle charger as shown above.
Power supply operation is automatic. This new Thordarson Power Pack, with a trickle charger and Yaxley Automatic Power Control, is operated by a single switch. When the regular filament control on the panel of the Hi-Q Receiver is turned "on" the B power supply is
automatically put in operation. Turning the same switch to the"off" position turns off the et and power supply nd automatically places the storage battery on charge. No more manipulating several switchesevery time you use the set. The
Thordarson Power Amplifier Supply Transformer — supplies current for both filament and plate of power tube, also the "B" supply for entire receiver
Yaxley Automatic Power Control Relay does this for you. It takes care of power supply and trickle charger both.
Never before, to our knowledge, has a power supply unit been designed especially for use with any given receiver. It's only reasonable that a thorough knowledge of the characteristics of both the Hammarlund-Roberts and the power supply unit under actual operating conditions makes for most efficient results.
Ask Your Dealer for Parts
Clip out the article in this issue of Broadcast for full instructions. Get the approved listed parts from your dealer and put this new Power Pack to work. It will not only increase the efficiency of your set but it will pay for itself through savings in B batteries and A battery recharging fees.
Yaxley Automatic Power Control Relay. Connects to the filament switch on your panel. Turns off your radio set and automatically sets the storage battery on charge in one operation
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