Better B&K amp?

I own lot of B&K amps and preamps. ST1400 2x105rms,AV6.5.4 6x60rms,2pcs-TX4430THX 3x200rms and 2pcs-AVP300THX, all are excellent performers especially in music.I guess EX4420 dual mono would be much better choice as I enjoyed much of what I got.

I own a B&K Reference 200.2 S2 amp, which is their current production amp. This thing never runs out of power and is very quiet. It only have a couple of inches above it to breath and yet it still hardly gets warm. With a new tube preamp, I would actually begin to make comparisons between this amp and tube amps. Nothing but smooth music at all volumes. The bass on this amp is very impressive. No subwoofer required even on music that would normally need it. I am powering a pair of Dali Ikon 6's with it. I have however powered many other pairs of speakers with it. As others have said, I would keep this amp even if I bought something better. Hope this helps

B&K is a great value player...their amps are their bread and butter for their product line. I have owned in the past the B&K Reference 200.2 and Reference 200.5, and they never failed me once. Solid build quality, no nonsense design, built in USA, very muscial amp. They are very good for the money. They make great stereo or multichannel application. Highly recommended. I am sure their older models are that good too.

I have the 442 Sonata, great amp, sweet sounds and warm pretty much inline with the above owners.

But may I ask, what is this modification mentioned above?

And does anyone know where to get service documentation?

I have (2) ST3030's, (1) EX442 & a Ref 30 Pre/Pro. An Ebay purchased fixer Ref 4420. I have also noted that I have Power LED's that do not light up but sound is good, anyone have this problem?

Thanks,
Mark