I used to have a Siltronix 1011d several years back and it was modded for 11 meters.From what I remember there was a tap on the coil that is located behind the front panel just to the side of the vfo box.I
am sure that there is a mod write up that you can find here somewhere and maybe if you googled it chances are really good you can locate a mod
The one that I had worked great on 11 meter
ssb ,it would go
AM mode but since those radios are very prone to drift they are not a very good
AM rig.....but if you let the radio warm up for a while they will settle down and the drift will be bearable...very tough old radio and alot of fun to use...I do miss the one that I had.
The 1011d and I think the 1011c came factory with a 8950 tube driver but you could run a M2057 and get a bit more power out of it ...about 100 watts with the 8950 and about 150 or a bit more on a good day with the M2057