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The RD150YB water-cooled 150kW transmitting triode in the collection is equivalent to the CAT17C valve. The similar CAT17 was used in the Marconi SWB18 shortwave transmitter, and so to illustrate the use of this valve information on this transmitter is represented here.
The Marconi SWB18 shortwave transmitter was designed to work between 13.5 and 80 metres with a carrier output of 100kW. The design used 'trucks' to enable tuned circuits to be interchanged by wheeling one out and another in, which enables very rapid frequency changes. Marconi SWB18 shortwave transmitter
Intermediate Amplifier, using two ACT9's and two CAT9's (lower). This amplifier could in fact be used as the output, generating 13kW to 17kW unmodulated carrier. Intermediate amplifier
CAT17 in its transport carriage. CAT17 in its cariage
CAT17 in the final amplifier. The large pieces of metal to the left of the valve are actually capacitors. CAT17 in final amplifier
All pictures on this page reproduced from The Marconi Review with the kind permission of Marconi plc - article reference: The Marconi Review No. 74 July-September 1939, 100 K.W. SHORT WAVE BROADCASTING TRANSMITTER. TYPE S.W.B. 14 & 18.

This file was last modified 15:28:17, Thursday September 28, 2006