New or Used Amplifier

I have different amps running my surround sound; I have tubes running main left and right and solid state running all the rest.I don't think the amps being different is a major concern but the center channel speaker matching the front left and right is of importance.
I would also buy used just do your homework on the gear you are considering.
I do not have any experience with YBA but do know it is a step above.
What are you considering thus far and what speakers as well?

I currently have two amplifiers - YBA2 HCDT (High Current Dual Transformer) and a YBA2 (DT)for the front L/R and center. I am looking for a rear amplifier for rear surround. Both are from the 1990's but function perfect and sound very musical.

My current thought was look for YBA 1 for front L/R since its' from same time period and has similar tonal qualities. The Passion series is a step up, but I was told it would sound different in my system and may stand out when playing with YBA 2 series.

If I upgraded to a newer amplifier like the Modwright or other, then it would have to be a big step up from YBA and I would place in in front L/R position. However, it would have to play in harmony with center which would be YBA 2 series.

My Genesis Advanced Technologies V speakers play very nice with YBA. Genesis V has servo amp for low end, so YBA is only for mid and highs. The rest of surround are Genesis Advanced Technologies surround sound system (RS1) and Sub 4/8.

I have no knowledge on Home Theatre, but want to keep my 2 channel in tact is primary importance. My YBA 2 preamp does not have a bypass, so I have to find a work-a-round or get something new. Also need Pre-Pro, with balanced/RCA capability for amps since rear is balanced cable. Using separate amplifiers instead of HT all-in-one receiver.

thanks for reply.

are you doing 5.1 or a larger setup?

5.1 only

I have champagne taste and a beer budget, that said I have bought many used pieces over the years.....I just picked up a really nice pair of Quicksilver amps that I could not have afforded new, maybe once my daughter graduates college that will change....

Some of my best purchases have been used, I won't hesitate to buy used if it is mint and I can get a good deal...