1969 Drake 4B Line HF Equipment Below is a picture of my vintage Drake 4B Series HF Station. The station includes an R-4B receiver, an MS-4 speaker, and a T-4XB transmitter. The station also includes an Astatic D-104 microphone. The AC-4 power supply for the transmitter is mounted in the rear of the speaker. The transmitter is in excellent shape with minimal rust on the copper-plated chassis. However, the receiver has considerable rust on the copper-plated chassis. I had to replace the filter capacitors and several tubes in the receiver to make it work properly. The receiver also has one incorrect knob. This station works well now. I have a 75 meter dipole in my back yard. I also have a Drake L4B linear amplifier and its L-4 PS power supply for the above station. It is shown below. The amplifier can use the following tubes: Amperex 8802/3-500Z Amperex 8163 Eimac 3-400Z Eimac 3-500Z Two tubes are required. The amplifier has the following specifications: Frequency Coverage 80 through 10 Meters Plate Input 2000W PEP on SSB 1000 dc on CW, AM, and RTTY Drive Requirements 100 W PEP on SSB 75 W on CW, AM, and RTTY Input Impedance 50 ohms Output Impedance Adjustable pi-network Intermodulation Distortion Products > -33 dB Wattmeter Accuracy 300 W forward & reflected, +/- 5% of reading + 3 W 3000 W forward, +/- 5% of reading +30 W Power Requirements 240 Vac 50-60 Hz, 15 A or 120 Vac 50-60 Hz, 30 A Below is a picture of the inside of the amplifier.
Posted on: Thu, 14 Aug 2014 23:05:41 +0000
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