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Smite ticks
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amplifier tubes such as 6D6, 78, etc.
Difficulty was experienced by some set manufacturers because the tuning indicator target current could not be controlled or limited satisfactorily. To remedy this trouble, a modified 6G5 was developed containing an internally connected grid to limit the target current. This new type was known as 6H5. After this type has been in use for a while, it became evident that it was superior to the original 6G5. Consequently, it was decided to discontinue the 6G5 and to brand the new tube 6G5/6H5 to indicate that it would replace both type 6G5 and type 6H5.
All of the above types were made in the familiar dome top bulb, size ST-12.
The increasing popularity of small sets and the demand for more compact tubes resulted in the development of the type 6U5, which is a 6G5/6H5 mounted in a tubular bulb, size T-9. This tube is identical in electrical characteristics to type 6G5/6H5 and is mechanically interchangeable, being the same length and using the same base. Type 6T5 is similar to the 6U5 except that the indicator shadow, instead of being wedge-shaped, is in the form of an annular ring.
The 6U5 may be used as a replacement for types 6G5, 6H5, 6G5/6H5 and 6T5.
Because these types are so nearly alike and are all interchangeable it has
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been decided to furnish only the newer tubular type. This type will be branded 6U5/6G5 to indicate complete interchangeability. Please note that tubes branded 6U5 and 6U5/6G5 are identical.
Summary: Use type 6U5/6G5 to replace 6U5, 6H5, 6G5/6H5 and 6T5.
Crosley model 120 Inoperative at low frequencies
Try a new oscillator tube, as the one in the set is not sensitive enough to oscillate at low frequencies. It may be necessary to try several tubes before you find one which is suitable for this circuit.
Schematic of Majestic's model 55 receiver. Signal path indicated by arrowheads — high voltage by extra heavy lines. 5« RADIO TODAY