CB Radio Galaxy Saturn Repair Tip: Distortion on SSB transmit
Distortion on SSB transmit sometimes causing premature failure of TR-51 (2SB-754 ).
This problem is usually caused by having the SSB ALC adjustment turned up too high. Do not adjust VR-12 full open ( 11 o'clock position ). Normally this adjustment should be not be turned past the 6 o'clock position.
Transmit power is very low (1 to 3 watts on AM). The Transmit Driver and Transmit Finals all test good. No amount of adjustment will improve the power level. Power is also low on SSB as well. TR44 driver bias (VR11) will not adjust.
Replace VR11 with a new variable unit. Be sure to replace VR11 with a 1/2 watt replacement or heavier. After replacement refer to the transmit alignment section, and adjust VR11 for the proper bias voltage on TR44. This same type of symptoms can occur when the final bias adjustments become defective. However this is not as common as the failure of VR11.