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RADIO BROADCAST ADVERTISER
rg AC Operate d 7 -HkIggg£fyPd T~One Switch Onhj ^ K HiQ ' '
This "B" Power Supply Unit has been ^designed and built especially for use with Hi-Q Receiver.
A-B-C Supply for Power Tube
Hook-up Your Hi-Q Receiver Direct to Your A-C House Current!
New A-C Operated Power Pack Supplies "B" Current for All Tubes and Both A and C Current for Power Tube
THIS new power supply unit designed es> pecially for use with the Hammarlund Roberts Receiver can be made by anyone at home by following the simple instructions in the constructional article, "Electrifying the Hi-Q Receiver" by Mr. Leslie G. Biles in this issue of Radio Broadcast. You simply mount a half-dozen tested parts and make sixteen connections; screw plug intoyour house current socket and solve your radio power problem for all time.
Everyone knows, the use of a power tube causes such heavy drain on "B" batteries that even the extra heavyduty type cannot be expected to last very long. Therefore it is decidedly economical to use current from your lamp socket — the logical source of power supply.
With this new Thordarson Power Supply Unit connected right to your A-C house current, you can maintain full "B" power constantly. No battery renewals are required. Distortion from B battery noises is eliminated. Reception
Resistance Ranee almost o 7 1 • 1 . r
to 5,000,000 ohms. Contin reacnes new neigjits or perfection.
Contains one 8 and two 2 mfd. filter condensers
uous current-carrying capa city 20 watts
In designing this "B" power supply unit for use with the Hammarlund-Roberts Hi-Q Receiver, the most advanced principles of "B" eliminator construction has been used, together with the advantages now offered through the use of the new Q. R. S. full wave high voltage gas-rectifier tube.
A unique feature of the Thordarson Compact is the perfectly balanced filament winding. The mid tap is taken from the exact electrical center. This center is not obtained merely by tapping a continuous winding, as is the common practice, but is taken from the common lead of two individual perfectly balanced coils, wound side by side.
This is vitally essential when silent operation is required, for it is only with a perfectly balanced filament winding that the A. C. hum can be completely obliterated.
Heretofore transformers have supplied only B-voltages for the rereceiver, and although sufficient voltage has been delivered to actuate the plate of the power tube, no provision has been made for the "A" current supply or large C voltage required. Storage bat
New full-wave gas rectifier tubes. Made under Q. R. S. patent applied for