AMPLIFIER AND LOUDSPEAKERS



AMPLIFIER No. 143A - FOR AMPLIFYING WEAK VOICES
AMP & LS No. 4
- SPEAKERSET 1 - WAITING AMPLIFIER
AMP & LS No. 5
- SPEAKERSET 2 - WAITING AMPLIFIER
AMP & LS No. 6A
- SPEAKERSET 3
AMP & LS No. 11A
- DORIC
AMP & LS No. 12A
- HARMONY
AMP & LS No. 13A
- USED WITH HERALD FEATUREPHONES
AMP & LS No. 14A
- USED WITH SL-1 FEATUREPHONES
AMP & LS No. 16A
- MELODY


The early amplifiers were called Repeaters Telephonic
REPEATERS, TELEPHONIC
 
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Last revised: November 11, 2021

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