The last two weekends I participated in the AWA 1929 QSO party. The main requirement is that the transmitter be a 1929 or earlier design. I ended up using my two tube TNT (tuned plate - not tuned grid) transmitter (see http://www.io.com/~nielw/tnt/tnt.htm ) while the receiver was a National SW3 three tube regen (see: http://www.io.com/~nielw/nat_list/sw3.htm ). See http://www.io.com/~nielw/1929Stn/1929Station.htm for more information and videos.
I was only on 80 and worked 8 stations, 7 in MN and one, WA3FFC, in PA. MN contacts were W0DGU, K0KCY, W0CWU, WA9WFA, W0NYQ, K0PK AND KB0ROB.