Any experience with Tandberg Amps?

It's a pretty good amp, not great. I have seen them in good condition go for well over $500. And depending on how old it is was probably between $1k-1500 new. So to answer your question, the quality is good, as to the sound, that is subjective, you are going to have to check it out.

Regardless, unless it is fried, you've found a bargain.

Not at all bad, I have had a 3026A for close to 20 years and am still using it as a bass amp. Very well built.

You got a great deal assuming it works.

What speakers and pre-amp will you use it with?

Clean Tandbergs in working order are collectibles. You might even sell it for a profit if desired. They are particularly sought after in their home country of Norway, I have found. I sold my tandberg to a gentleman there a while back.

I had a Tandberg tr-2080 receiver that I used just for the amp section from time to time. It had a very clean, warm and inviting sound, especially for a SS amp. I particularly liked it with my Dynaudio Contour 1.3 mk II speaks.