Actually......many consider it's better to run the IEM transmitter fairly hot (not clipping driving it into limiting though) and then run the level on the pack lower adjusting that overall volume as needed. Doing that can help your ears if there is a sudden blast of interference noise ect. If the pack is turned way up noise from any interference will be really loud.
+1. Quiet IEM TXs + a little bad luck = permanent hearing damage.
Running the TXs hot also helps to keep the noise floor down (and the Sennheiser IEM TXs have a pretty forgiving/transparent input limiter).
{...} The singer finally sold the unit and got herself a Shure SLXD which operates in the UHF band. No issues since then {...}
Unfortunately, I think this is the best advice any of us can give you. When it comes to devices operating in the 2.4 GHz range (and regardless of manufacturer), interference/drop-outs aren't a question of "if" but rather of "when", so using them in audience-facing applications is strongly discouraged by basically everyone on these forums.
I have not had occasion to make that conversion but from the looks of the service manual the primary change is in the flyback PSU board. If you can find that board marking the designations are on this list. The only problem I ever had with the Lab 34/6400s we stocked were the 10000ufd filter caps on the SP80 board. Several of those caps failed over the course of twenty years and we always replaced them in pairs. Might be worth checking those as well.
I have these NL8 cables available for sale. Shipping from 20910 . I've priced them less than a third of the price of new cables from Sweetwater. Buy them all and I'll throw in my collection of loose NL8 connectors. Don't rattle my cage with how much to ship to your location. What ever it costs they'll still be far less than buying new.
To follow up contact me at rentals at espsound dot calm
