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Sunn concert head

I briefly used a Sunn Concert bass head in the mid 80s, loved it. I've now come across a Sunn Concert lead head from the same era. My question: is the lead head just a duel channel version of the bass head with added reverb, the sold with a different speaker cabinet?
 
I had the 2nd gen version of the Concert Bass amp; it was great and plenty loud enough back in the late '70s to cover any size venue I played, using a '60s Traynor YT-15 sealed cabinet with EVM15L drivers in it.
 
I used a concert lead head to push a pair of JBL K145s in a sunn 215BH box for about for about 4 years. It worked fine...but then one day a buddy of mine brought a magnavox SVT head to a gig for me to try out...

That was the end of that. 30 years later I'm still using that SVT. :D