the preamp was fitted for early radios that didn't have mic preamps built in unike Macs ts430 which has, if you use the preamp on most modern ham sets the audio will be distorted, they don't need it,
i mind about 10 years ago i spoke to a guy in the usa who i believe was using a ts850 or ts950, i couldn't believe how shite his audio was on ssb, he told me he had asked everyone how to improve it as it was rasping and farting like fuck on ssb, but he could not find any help among his local cb'ers, i asked him what mike he was using, when he said the mc60a i was gobsmacked as i used one on my ts50 and it sounded ace,
i realised right away he had the preamp turned on and told him to turn it off, straight away he had bbc audio, about 10 mins after he stopped thanking me he realised one tiny mistake had been making him look like a guy with all the gear and no idea, i was only too glad to help him find the true prowess of such a fantastic setup, i hope now 10 to 12 years later he is still enjoying that radio, it truly sounded sublime after he turned off the preamp.
if he's on here and remembers the conversation with 108yz024 i hope he's had the pleasure a set up and investment like that truly deserves.
and i sincerely hope he's regained the hair he must have clawed out trying to solve that problem.
it shouldn't need an adaptor for a ts480, as most kenwod hf sets use the same mic wiring, you will search long and hard before you find a better microphone than an mc60a at the price they retail at, it truly is sublime in the right hands and on many many different radios including cb's.