Try www.orionbluebook.com for prices on used gear.
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Hello Sawchuck. I am not sure of their market value today however.... they are simply oustanding amplifiers, built like tanks, hard wired point to point with robust power supplies and a simple, well laid out and straight forward topology. The later versions employed a switch to run them in triode. They would certainly cost a bunch if reproduced again today.You could say I am a big fan as I have owned, repaired and modified a few over the years.