Greetings. I've been refurbishing an older rig for a co-worker (IC-736). It came with the original hand mic (HM-36) and seems to have very low audio in TX. While watching the ALC meter and adjusting the Mic Gain I see no movement. Finally, with the gain fully advanced and speaking quite loudly into the mic I see the needle move. I engaged the compression and it got a little better. I swapped it with a spare HM-36 from my extra parts box. I was able to back the gain off about a quarter of a turn and still see some deflection on the meter. On air testing with hams in VA and AR confirmed low TX audio. I turned on the compression and they both said audio was perfect. That's fine with me as long as the audio is clear but I'm not used to using so much gain, or compression for that matter. Anyone have any ideas as to what would cause the original mic audio to be so low? I know it's fairly old. Maybe the ICOM hand mics are just weak? Incidentally, the meter works as expected when tested with my spare SM-8 mic and Heil iCM. I hate to give up my spare hand mic in case I want to go portable. Thanks for any suggestions.