I have Altec Valencias (Heathkit 101’s). I bought them because I was curious about the Altec sound. Short story, I love ’em! I alternate them in with my Von Schweikert db99 speakers.
Interesting that the Franks have been brought up in this thread. They are my favorite amps. I use EML XLS 300B tubes. With the Franks, my Altecs disappear with a floor to ceiling, wall to wall, soundstage. Big, realistic, sized images. Images are easy to "see" in front of you. You are there. Wonderful tone, albeit my Altecs can sound a bit strident at very high volumes (over 90db). This is with original 50 year old crossover capacitors that no doubt need to be replaced.
My 1.5 watt per channel SET 45 amps are also very good with my Altecs, but they have a little less flesh on the bones compared to the Franks. It’s nice to switch these in once in awhile.
My OTL monoblocks are just okay, very clear sounding but somewhat analytical.
Each of these amps are very quiet with the Altecs. Low noise floor, no buzz, hum, or hiss.