Harvey-Wells TBS-50D INFO

Harvey-Wells TBS-50D

1947 AM/CW Amateur Transmitter

GENERAL
The TBS-50D is a versitile general purpose AM Phone/CW transmitter capable of delivering RF
power on all 1947 amateur bands from 3.5 to 148 mhz. It may be used with any power supply
delivering up to 450 volts DC. The tube filiaments may be configured for 6 or 12 volt operation.
Dynamotor and vibrator power supplies may be used for mobile operation. An AC power supply
is used for fixed station use. Three transmitter models are availiable, TBS-50B for CW only, the
TBS-50C for carbon microphones, the TBS-50D with a built-in, three tube preamplifier for
crystal or high impeadance dynamic microphones. The TBS-50c/d models supercede the original
TBS-50 and 50A, and are improved models.

TECHNICAL CHARACTERISTICS
Size: 13-1/4" High x 9-1/4" Wide x 8-1/2" Deep
Weight: 17 pounds
Power Input: 50 watts HF
Tubes

6AQ5 Oscillator/Multiplier
6AQ5 Multiplier
807 Final Amplifer
6L6(2) Modulators
6AU6 1st Speech Amplifier
6AU6 2nd Speech Amplifier
12AU7 Phase Inverter
Frequencies: 3.5 , 7.0, 14.0, 21.0, 28.0, 50.0, 144.0
Microphone-TBS-50D Crystal or high impeadance dynamic at -50 db
Microphone-TBS-50C Carbon 200 ohm
FREQUENCY CONTROL
Crystal- 3.5-14.0= 3.5, 21/28= 7.0, 50.0=5.555, 144= 8.0
VFO (with output in same ranges)
OUTPUT COUPLING
Simplified pi type designed for non-reactive anatennas or feeders between 50-500 ohms

3.5 & 7.0 Mhz band require 500-1000mmfd antenna bypass condenser
Use of a balanced Output Antenna Tuner suggested.
POWER JACK: Octal type
MODIFICATIONS
PTT Relay Addition (Power and Antenna)
160 meter Operation
TVI shielding
Antenna Coupling Network/Switch