Tune-Up; 2950 Tune Up/Mod - Ranger RCI-2950 Service Manual

TUNE-UP

2950 TUNE UP/MOD

To increase heat dissapation and durability and a decrease of transmit voltage drop change Q-51 to an ECG37 or equiv.
To prevent overheating and increase audio Quality & low pwr swing change Q53 to a 2SA473
To improve low power swing on AM locate R178 and change to a 3k ohm.The resesitor you just removed save for the
next step.(4.7k)
Locate R194 (10k ohm) replace with the 4.7k resistor from previous step.
Locate R281 (4.7k ohm) replace with the 10k resistor from the previous step.
For increased output on SSB and AM locate C270 and parallel with a 470pF-1kv ceramic disc capacitor.
Replace all plastic insulators with mica insulators on all transistors. Use a liberal amount of heat sink compound.
For improved modulation remove Q32, which is the modulation limiter.
www.radioaficion.com