Oops forgot to cast a vote on this. The Threshold SA3 power amplifier. 50 Watts per side pure Class A. Clearly one of Nelson Pass most brilliant designs. Has all one could possibly ask from a power amp. To do better would have to go Pass Labs X350 at several thousand dollars. At present the SA3 is back up to the Forte 4a which is another glorious 50 per side Class A amp from the Threshold/Forte stable of fine products. To replace either would indeed be costly for what I consider a small increase in performance.
Audio's Most Enduring Products.
Lets hear for the products that you have that continue to deliver the promise. Enduring Value for the money spent. Where to upgrade today would cost you dearly for a marginal increase in performance. These products can be amplifiers,pre amps,tuners,cd players,turntables,tweaks you get the idea. Most products will have been made between 1965 to 1995. Remember these are products you still have in your system.