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RADIO BROADCAST ADVERTISER
The DAVEN SUPER AMPLIFIER
A 3-stage RESISTANCE COUPLED UNIT which gives you that perfect tonequality you are seeking. It is already wired and may be made a part of your set with a minimum of assembly labor. The merits of this modern form of amplification are so appreciated that progressive set builders are adopting the SUPER AMPLIFIER for perfect results. It costs less to install and adds greatly to the life of your "B" Batteries.
The DAVEN AMPLIFIER KITS are
for those who desire Resistance Coupled Amplification, but who would rather assemble their own amplifier. Sold in three or four stage kits with complete instructions for assembly.
555? Sine o^Jirei
Obtain from your Dealer the "RESISTOR MANUAL/' our complete handbook on Resistance Coupled Amplification. Price 25c. Postpaid 35c.
s/or Specid/isdNEWARK. N.J.
Make your set a Super-Het
The circuit described on page 254 of June Radio Broadcast will change any set into a super-heterodyne. It is particularly applicable to five tube neutrodyne and tuned RF sets. It changes these two circuits into super-heterodynes as good as most, and considerably better in some respects than any super-heterodyne circuit ever devised.
Stations come in at but one point on the oscillator dial. There is mathematically no possibility of harmonics. Full scale blue-prints with reprint of article $1.00.
Eastern Coil antenna coupler $6.00 O'Connor oscillator coupler . . 6.00 Special fixed condenser . . . .60 Complete parts including panel drilled and engraved, special formica bushings, screws, and wire, blue prints and reprint 37.50
A. O'CONNOR & COMPANY
SUPER-HETERODYNE HEADQUARTERS SINCE 1923 9702 Euclid Avenue, Cleveland, Ohio
^ FRANCE „ Proven ^Vp^'CHAReeR Superior!
France Silent Super Charger charges 2, 4, 6 or 8 Volt storage battery at 5 to 7 Ampere Rate: charges 20 to 120 Volts of "B" Radio storage batteries IN SERIES at varying rates as desired.
Price $22.00; West of Rockies $23.00. Canadian prices upon request.
The France Mfg. Co.
10327 Berea Road Cleveland Ohio
PEERLESS TWIN-AUD
may be substituted in any circuit in place of any two audio transformers regardless of specifications or price with the assurance that the result will be Greater Volume and Clearer Reproduction beT ict PW/v> $Q-50 cause of its two
msi 1 net y stages of balanced
AT ALL GOOD DEALERS audio amplification.
TWIN-AUD TO-DAY—
Buy
PEERLESS RADIO CORPORATION
Newton Lower Falls Boston, Mass.
-fc Tested and approved by Radio Broadcast ^