here's a cut/paste from the auction description of the only one I seen sell on ebay, about 6months ago...
"This amp uses a partridge WFB/.95 Partridge output transformer , a pair of British KT-66 output tubes, a 6SN7, a 12AU7 and a 5V4. The circuitry employed is the famous Williamson triode Class A and is rated at 15 watts RMS and a frequency response flat from 10 -100000 cps. Output impedance is 4,8,16, 32 ohms This is the last and rarest version issued - GOLD color with the rare potted power transformer not availalble on the cream and chrome versions.. It was available for less than a year in 1959. Personally, I think sound quality is better than the Marantz 2 or any of the McIntosh mono blocks."
..BTW, she sold for $1700, and she wasn't in as nice shape as mine.