[Drake] keying L4B

[K5YY]

My Icom 781 can sink 100V AC at .5 amps.  The K1 TR relay in the L4B is
about 100V DC but does not say what current it sinks. I do not want to
exceed the .5 current rating of the internal Icom contacts in PTT line.
Older linears with 100v relays can draw up to .750 or even 1 amp.  Please
advise if the newer rigs can key the L4B or L7 for that matter without using
an interconnecting relay system.  Hate to rig up a 12V relay externally to
key the L4B if unnecessary. Thanks,  San K5YY