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120
Radio Broadcast
fairly well, without causing unpleasant relations with your neighbors; but if you are in the city, you will do well to procure some other
outfit.
Most single-tube receivers are designed lor operation with ear phones, though amplifiers may be added so as to permit the use of a loud speaker. A single-tube receiver, operated on the tuned "reflex" principle described in last month's RADIO BROADCAST will, however, operate a loud speaker over a distance of approximately twenty-five miles.
The three-circuit regenerative receiver is another satisfactory type. It is made by several reliable manufacturers and varies in price from about $100 to $225, complete with batteries, tube, phones, antenna equipment, etc. is a great deal more selective than the singlecircuit regenerative outfit but somewhat harder to tune than the reflex receiver mentioned
above.
Loops are not satisfactory with these receivers, as a rule, but the antenna attachment may generally be used.
Special attention should be given the matter of accessories, especially where an amplifier is to be added later, for operating a loud speaker. A receiver with a dry-cell tube will be satisfactory for head-phone operation but
where a loud speaker is to be used, it is better to figure on 6-volt tubes and a storage battery.
Single-tube receivers for dry-cell operation may be had complete for from $50 to $125. They will operate over distances up to several hundred miles under favorable conditions.
WHAT TWO TUBES WILL DO FOR YOU
THE addition of a second tube is of value when you are within a short distance of a broadcasting station, because it will permit the use of a loud speaker. There are several twotube outfits on the market, some of them being of the portable type.
The additional tube is used in one of two ways: either as a radio-frequency or audiofrequency amplifier. The difference lies in the fact that radio frequency (R.F.) amplification increases the range of the set but adds little to the volume, while audio-frequency (A.F.) amplification adds volume but does not increase the range. You have your choice. Under most conditions the addition of the A.F. amplification is preferable.
THEN THERE ARE THREE TUBES
THE number of receivers employing three tubes is rapidly increasing and they are becoming popular because a loud speaker may be used with them. 'And this matter of loud speakers leads us to
A PORTABLE SET USING TWO DRY-CELL TUBES All batteries are inside the cabinet. Outside connections are necessary for antenna, ground, and head-phones