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Title: Collins VFO Problems Post by: ka4lbi on October 16, 2021, 01:32:31 AM Hello all, this my first go-round with this forum so bear with me.... I am attempting a repair on a 32s-3 transmitter and moving trough the block diagram and the schematic, I got to the first mixer V4a and at pin 2 and pin 7 of the 12at7 in transmit mode, all I have is 455 khz. and no VFO input resulting in no 3.155 to 2.995 Mhz out put to T1. I tried to trace the output of the VFO V301 but the tube socket pins are not available for testing. the multiconductor cable that come from the 70K-2 assembly has coaxial line that goes to the device behind the Frequency Control Selector Switch. when I select the Transmitter VFO selection where is the best place to measure the output of the VFO? Respectfully, Brooks Barnes KA4LBI
Title: Re: Collins VFO Problems Post by: WBear2GCR on October 23, 2021, 07:48:04 AM I've not worked on that transmitter. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
But, they sell extenders that plug into tube sockets and have test lugs arrayed around the top, where you plug in the tube. Ebay usually has some... _-_-bear |