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.RADIO BROADCAST (ADVERTISER.
Potter Condensers
Quality, Long Life
HpHE selection -*• of leading manufacturers for the finest radio receivers. Insure the operation of your radio set or power amplifier with Potter condensers.
Condenser Block o type tube ampli
Potter T-2900
for the single fier— $20.00.
Potter T-2950 Condenser Block for the push-pull 250 type tube amplifier—$22.50.
Potter T-2098 Condenser Block for the single 210 type tube amplifier—$20.00.
Potter SM-673 Condenser Block for Silver Marshall Power Amplifier and Power Supply units— $20.00.
Potter 105-05 Interference Eliminator for oil burner and ice machine motors — $3.75.
The Potter Go.
North Chicago, Illinois
A National Organization at Your Sercue
The
Vital
Point
Since any radio, old or new, is onlyjust as good as the tubes in its sockets, it is clear how vital a point perfectly balanced tubes are.
The brand of radio tube is just as important as the "make" of the set.
Insist on
/f^ RADIO ^TUBESS
for clear
reception
PRODUCTS I
Dongan Electric Mfcr. Co.
Name
Street . City. . .
State.
For Power Amplification Select from Successful Parts of the
l928-'29 Season
It is so easy now to re-build your set for power amplification that there is little excuse for anyone not having the full-throated, inspiring natural tones and volume of up-tothe-minute radio. The Approved Dongan Power Amplifier Parts listed here are the choice offerings of the current season — are in use now in tens of thousands of sets throughout America.
For Use with U X 250 Tubes
No. 7568 — Transformer for full wave rectification using 2 UX 281 tubes to supply B and C power to receiver and power for 2 UX 250 tubes $13.50
No. 8529 — Transformer similar to No. 7568 with the addition of 2 low voltage windings, one for 226 tubes and the other for 227 tubes so that you can build a power amplifier for either radio receiver or phonograph pick-up $16.50
No. 65 51 — Double Choke, for use with above transformers $1 5.00
D-60U — Power Amplifier Condenser Unit. $16.50
D-307 — A Condenser Block, used in connection with D-600 $10.00
No. 1177 — Straight Power Amplifier Output Transformer #12 00
No. 1176— Same as No. 1177 but of Push Pull type $12.00
Check items you are interested in and return with coupon — complete information sent to you at once. You can secure immediate delivery of any item by inclosing check or money order.
Custom Set Builders
Your trade will get the best from sets built up with these parts. Discounts quoted on request.
DONGAN ELECTRIC MFG. CO.
2991-3001 Franklin Street Detroit
TYPE 587-B
Power Speaker Filter
The Type 587-B Speaker Filter is intended for use in the output of such power tubes as the 250 type, where the plate current is laige, but the tube impedance is so low that no adjustment of impedance is needed. The Type 587:B Speaker Filter is suitable for use following impedances of 2000 to 10,000 ohms. The speaker is thoroughly insulated from the high voltage by means of 4-MF. condensers in each speaker lead.
GENERAL RADIO CO.
Bulletin No. 931 -B will be sent on request
30 State Street, Cambridge, Mass. 274 Brannan St., San Francisco, Calif.
Type 587-B Power Speaker Filter. Price $9.00
• february. 1929 . . . page 281 •