From reading the forum here, I understand you're a tech and probably have the SM for that unit but just in case you don't have it, you can download it at
The original service manual sitting in front of me only gives 337-1000 "C.R.T. w/13 Pin Nixie Base", this is not the kind of information that yields a working part.
You are going to have a hard time finding that tube. The last of them in the US were scooped up by those that own a 18 or 19. And this is from personal experience. When I sold my 18 I also had a NIB tube. The tube sold for more than the receiver!!!!
dewickt,
I have a NOS Telefunken scope CRT (tube) part number D 3-11 GJ
It is supposed to work in a Marantz model 18, 19 and I think 20.
It's been sitting in my shop for the last 35 years or so. It has never been used. Let me know if you are still looking for this tube.
Hi, meg,
Since that thread is kinda old, I doubt Terry will catch it. I suggest you send him an email. He is one of the site sponsers. Look for the banner at the bottom of the pages. His shop is "Dewick Repairs".