Moderators: I am aware that this question in not really on topic. But I place it here as those -if any- who know the answer will read it here.
Do move this if there's a better place for it. I didn't place it in Babbling as it is not meant as a chitchat question, but a genuine detail question about Apollo equipment.

Concerning the Apollo mission:

The tracking stations used amplifiers for their tracking task. According to the website of Audio Equipment company Marantz, NASA used a modified "Marantz Model 9" monoblock tube power amplifier called the 9120 for this task. It was modified to make it even more stable than the Model 9.

I am looking for ANY info on this 9120 amplifiers (how they were used, production numbers, whereabouts, pics, for sale or sold in the past, specs...anything!).

I already asked this question at NASA public contact, so there's no need to mail them again.

A detail question from the sideline of the Apollo project!
Apollo freaks, amaze me and tell me everything you know about what could very well be the best amplifier ever.

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