Bridging EAR 890's

WHY? Honestly, your amp is 70 wpc of pure tubes, your speakers are 92db at 1 watt. That puts you at about 110db continuous. That's without a pair of 500 watt subs. Are you using a crossover on the speakers or running them full range?
By bridging to 140wpc will only gain you about 3db which probably isn't even audible.
I do speak from experience having owned the 509's with coincident speakers rated at 92db. Things got pretty loud at 10 watts. I can't imagine needing 140wpc.

Elevick, thanks for the reply. Why? Good question. Honest answer.. Because I like to tweak. I have an opportunity to acquire another 890 at a very good price. I run my speakers full range. I'm not a fully knowledgeable audiophile. Thinking full separation of L vs. R. Shorter cable runs. More flexibility with future speaker decisions. And, it will look nice.

I had EAR 890 years ago and it's a fantastic amp. I would run them in mono if I have 2. I THINK flip a switch and jump the 2 channels ... contact a EAR dealer or distributor for more info.

I would take the extra money and put it towards cables, music, room treatments etc...

One thing I am curious about: Have you tried running these without the subs connected at all? How's the sound?