World War II Navy Radio
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NOTE - This is a re-creation of Rob Flory's original site which crashed some time ago - unfortunately some photos are still missing but most of the text is here - if you can help with any replacement photos, please send e-mail to Rob or to Nick K4NYW

Click here for Nick's 1950's-60's Navy Radio Pages -


The TBL transmitter combines LF/MF/HF in one package.  Frequency coverage is 175-600kc and 2-18.1Mc.  It uses 2 860 master oscillators, 860 intermediate amplifier, 860 modulator, and a pair of 803s in the final amplifier giving a rated power output of 200W CW, 100W MCW(LF/MF only), 50W AM.   Aside from the master oscillators, tubes are shared between the LF/MF and HF (2-18.1Mc).  It can be split into two units, making it narrow enough to load through a 20 by 25-inch hatch as on a submarine. 
The TBL is powered by a seperate motor-generator unit.  A controller unit starts and stops the motor-generator.  There are at least two different speech input units designed for the TBL.
Mine is a TBL-5, CAY-52133 made by Westinghouse, with a contract date of 22 Nov. 1939. 

TBL Master Oscillator Compartment

Above is a picture of the master oscillator compartment with cover removed.  The compartment is insulated with felt and has a blower at the bottom.
In the top portion is the variometer used to adjust LF/MF frequency.  In the lower portion a permeability-tuned inductor with a brass slug can be seen.

TBL HF antenna circuit

Above is a picture of the HF antenna circuit compartment, at the start of restoration.  The inside of this transmitter was very dirty.  The upper roller inductor has been removed, cleaned, and temporarily replaced to show the contrast with the uncleaned one below.  Before it is completely replaced, the shelf on which it is mounted will be removed to clean the cylindrical coupling capacitor and the frame and components behind it.
This transmitter is going to require a great deal of restoration, with the removal of most major components so they can be cleaned.