am/fm tube tuners

McIntosh MR65 with multiplex feature. I think that is the only McIntosh tube tuber with AM/FM; all others are FM only. Expect to have to put money into anything that old you buy as almost certainly passive parts (tubes, capacitors, etc) will require replacement as this is a 40 year old item.

I would strongly urge you to pass on the tubes and look for a mint Accuphase T100 AM/FM tuner and then have it upgraded by Don Scott. You will then have one of the best tuners on the planet for about a grand. These tuners typically sell for 550/625 used and are very, very good.

Most of the information you require is at this website:
http://www.fmtunerinfo.com/

The Accuphase tuners are discussed here:
http://www.fmtunerinfo.com/reviewsA-N.html#accuphase

There is a seperate page for tubed tuners. Fisher and Scott offered some nice tuners; you can find the Fisher and Scott fan pages with all the info. When looking for Scott and you cannot find anything try "HH Scott" in the search as that was the actual name of the company.

Good luck.

Try a Leak Troughline with a modern decoder. This is a great tuner when properly adjusted with a good quality aerial. Many people in the Uk would say that they are still amongst the best sounding tuners regardless of price. Only thing is they are FM only. Still, at only about 100 GBP (185 USD) with a new decoder at say 300 USD, they're very reasonable.

Tuners are the one audio component where it is hard to say that transistors don't beat out tubes. For a start, a circuit called a "phase locked loop" far outperforms other demodulation schemes, and, although it was invented long ago, could not be realized in hardware until integrated circuits became available. Also, analog tuners involve a lot of critically tuned inductors, and the heat of tubes is bad news for them.

I suppose you could make a tuner where the RF stages were transistors and the audio stages were tubes. I doubt that such an animal actually exists.