It could be Earl Young
The Ambassadors - Soul Summit LP does not cite him in the band, but has a picture of him as the drummer.
"Earl Young (born June 2, 1940, Philadelphia) is a Philadelphia-based drummer who rose to prominence in the early 1970s as part of the Philly Soul sound. Young is best known as the founder and leader of The Trammps who had a hit record with "Disco Inferno". Young, along with Ronnie Baker and Norman Harris (the trio best known as Baker-Harris-Young), was the owner of the Golden Fleece record label.
Young is seen as the inventor of the disco style of rock drumming (in Harold Melvin & The Blue Notes's "The Love I Lost" from 1973), as he was the first to make extensive and distinctive use of the hi-hat cymbal throughout the playing time of an R & B recording. This led to DJs favoring his recordings because they could hear the cymbal quite easily in their headphones as they "cued up" records to be mixed.
Young featured prominently on many Philadelphia International Records (PIR) recordings before moving on to Salsoul Records as part of the house band for the label. He recorded extensively at Philadelphia's Sigma Sound Studios as part of the group of musicians knows as MFSB. In a 2005 interview with Modern Drummer magazine, bassist Anthony Jackson was asked whether he recalled working with Young: "Yes, of course. That was back in the days when I was working with Gamble & Huff in Philadelphia. I didn't get to do too much with Earl because I was usually playing with Billy Paul's band, and Norman Farrington was on drums. But as I continued working for Gamble & Huff, I did a few sessions with Earl. My big Earl project was the O'Jays' 'For The Love Of Money.' I was astounded by his power. It may not come through on the records, but he is an ass-kicker. Listen to a classic Earl Young track like Harold Melvin & The Blue Notes' 'If You Don't Know Me By Now.' There's no click track. Earl had the drummer's equivalent of perfect pitch. I only saw the term referred to once, and it's called 'infallible rhythm.' Nobody has absolutely perfect time, but you find people like Buddy Rich and Tony Williams who can play without the time drifting. I've also seen studio drumming great James Gadson demonstrate infallible rhythm. I've seen him overdub drums on a track without a click track, and it's just perfect. I haven't spoken to Earl Young since we cut that record, but I've never forgotten those sessions. Earl stands as one of the great drummers. I'll never forget the impact that he made."."