[dutchccr]

All CCR members used Kustom amps.

Stu Cook's K200 A-4 amp head (identical to John's) is for sale at a collector's website.
There was also an Ebay listing of a K150-7 which was supposedly their backstage/practice amp. The seller says he acquired it directly from Doug Clifford's son Brent. He also recently sold John's backup amp (K200 A-4 with 2x15'' cab) with CREEDENCE marked upside-down on the back.

John's famous Kustom certainly wasn't his only one. If you look closely at the video footage of them in the Albert Hall, there is indeed a Kustom stack visible behind Doug. I suppose that's the recently sold 'backup-amp'.

I don't think they ever used K200 B-4 heads. I've heard rumors of people marking old Kustoms with CREEDENCE so that they can pretend it was John's.
Could you upload some pics please?