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General Electric Co., Syracuse, N. Y. |
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General Electric Co., Syracuse, N. Y. |
GE BT-25 and 50 Series
General Electric was the manufacturing arm for the companies building early broadcast transmitters. Westinghouse was heavy into the control circuitry and RCA packaged a lot from these two.
The
GE 50 kW Series:|
pre-1935 |
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| GE (with some help from Westinghouse) built many of the early transmitters, especially the higher powered ones. In fact, RCA did not build their own transmitters until the mid-1930s, actually selling GE models with and RCA label. Even the RCA 50A and 50B/C were really GE transmitters with an RCA nameplate on it. It was after the breakup | |
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4BT-25-A (1935? 1947?) |
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GE was first permitted, under the Consent Decree, to market
its own transmitters in 1935. The first 50 kW unit by GE had the model number
BT-25-A.
The BT-25 was a high-level plate modulated transmitter. BT-25 used Westinghouse WL5891 tubes (one spare in each cubicle, total 6).
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4BT-25-A1 |
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KCBS, San Francisco Installed 1963 |
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4BT-50A |
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The 4BT-50-A used 6427 Machlett tubes in a far more compact cabinet design.
Bill Frahm says: KOA, KNX, WSM had versions of it. Seems to me
the I had the GE BT50-A1 in Boise, built in 1964 -65. Our A1 had the 4400 v inductor on the primaries of the three 480 v pole-pegs. Other stations using the GE transmitters include KRLD, KPOL, WLS and others
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4BT-50B |
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KPOL, Los Angeles (BT-50B???) |
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4BT-50C |
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| The 50C seems to have been an upgrade from the 50B, the BTC-50-C was built in Canada. | |
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The Canadian General Electric BTC-50-C |
