Most will call me crazy, but I'm going off the board here with the late-50s TA-500 mono receiver. No, I am not an audiophile, but I have had the pleasure of owning all of the 400/500/800 iterations as well as Fisher mono blocks and early 1960s receivers. My TA-500 is an early production/prototype model, and of my remaining anachronistic impractical heavy stuff that's very expensive to repair and now requires shipping half-way across the country to do so, it's the last that I will get rid of. For anyone who has never previewed a TA-500 I highly recommend checking it out: it has the thick tube tone which is the barometer by which all others are measured. Mine still has the original EL37 output tubes, though I have two sets of backups that I had the foresight to procure 25 years ago (which is likely 2 sets more than I will need in this lifetime).