When I think bad finals I think no output. I have a Cobra 29 made in 1993 that had an rf feedback problem with the mic gain set to max. I could turn the mic gain down and stop it but the feedback could be heard with modulation. It has all new electrolytic caps and worked good otherwise. I swapped the final and driver with ones from a parts rig and all is well. Has anyone ran into this? The final is now a 1969 because that's what I had on hand.
I also used a string of diodes in series with d8 to lower the carrier instead of the usual cap and resistor or tip 120 at the collector of the driver. The modulation peaks are much cleaner this way. For those who have done this mod have you noticed the diodes get warm on long transmissions?
D8 was removed and replaced with 6 6a10 diodes. I suppose the 3.6v drop will make some heat but I didn't expect 6 amp diodes to get warm at all. The rig draws less than 3 amps at full strap.
I also used a string of diodes in series with d8 to lower the carrier instead of the usual cap and resistor or tip 120 at the collector of the driver. The modulation peaks are much cleaner this way. For those who have done this mod have you noticed the diodes get warm on long transmissions?
D8 was removed and replaced with 6 6a10 diodes. I suppose the 3.6v drop will make some heat but I didn't expect 6 amp diodes to get warm at all. The rig draws less than 3 amps at full strap.
