What is a good amp that cost no more then 3500.00

There are many. BUY USED and save $1000s.

Tube: Conrad Premier 11 (can but bought for $3000)

My recommendation is purchase 2 music fidelty A3cr (solid state)and bi amp. They are very hard to find used because they are so, so good. You should be able to get them new for about $1500 each. One will work with efficient speakers.
Get the A3cr not the 300. Match it with an ADCOM 750 preamp. You can get that used for about $750 - $900.

You will have a superb set up for a song. I have treid almost all the names you see on Audiogon (Madgril, Cary, CJ,
Audio Research, McCormack, YBA, REGA, and many more.)

The reality the above combination with efficient speakers will do about as good as it gets.

Best speakers for the $$$ Virgo (biwireable) and Dunlavy IV
(not the IVa). Either of these can be had used for about $2500 - $3000 used)

Inteconnects for the money Audioquest Quartz.(Used - $75).
Speaker wire for the money Audioquest midnight III or dh labs (Used $200-$400).

Yo, Dzz; You got to say what speakers you got./ and do you plan to keep them? How big is the room/ how loud do you listen? Is the rest of your equipment in keeping with a 7/8k amp? So many speakers "need" SS and there are many that don't. There are many great amps in this range / making the right choice is partly dependant on the ans. to some of my questions.

I've owned many amps, tube and solid state, and my favorite
thus far (which I've been using now for 2+ years) is the
Mark Levinson 27.5 It has a smooth, refined presentation,
excellent bass definition and slam, extended and pure
high frequencies and superb imaging/soundstaging. It is
also essentially "bulletproof". They can be found occasionally used for $1900-2100 in excellent condition.
They will also lose very little on resale as there is a
demand for them. They were last made in 1995. Even 3-4
years ago, they sold for about $2000 used.

Depending on speakers and it may be hard to beat the Gamut D-200 (SS) or the Pathos twin towers (hybrid) in this price range.