SET amp recommendations for Zu Definition II's

The RWA 70.2/Isabella sounded plastic/cardboard next to my Atma-Sphere amps on my Zu Presence speakers. Even the Art Audio PX25 smoked the RWA and made them sound like a toy amp.

I would call the Zu boys and get their take.

I sure would like to buy your Def's LOL.

845 SET amps excel with Definitions. Lots of choices driven by your budget. The 845 drives Definitions energetically, with bass definition appropriate to the speaker's deep response. There are significant differences as you climb the price ladder, but at any given cost stratum, an available 845SET amp will outclass a push-pull tube amp of similar power, or a PSET 300B on Definition 1.5, 1.9 and 2.0. You'll get wide dynamic range, SET subtlety in details, superior tone density and serious drive.

I use Audion Black Shadow mono blocks. They aren't inexpensive. But as you go lower in price, Mastersound, DeHavilland, Sophia, Tri, Dared, Melody and upstart Asian brands give you plenty of alternatives.

You then have ability to tune via tube selection. Input and driver tubes are influential, but since most of these amps are supplied stock with the cheap 845A tube, an upgrade to the affordable 845B is usually in order. The new Shuguang Psvane 845 may be an upgrade too.

Phil

Schw,
There`s a recent thread by Afc which compared the Mastersound 845 amp to the Coincident FrankensteinMK2 on his Zu speakers. This may be of interest to you.

I would use the Coincident Technology Frankenstein's at 8 watt/channel and MSRP $5,000. Thy are as clean as a whistle and surprisingly powerful sounding. If one needs more tube power the Coincident Technology Dragon's at 70 watt are also great.

I have been using a Yamamoto A-09S, 300B amp for last 2 years with my Def IIs. I have had no desire to change. I did demo the Art Audio PX-25 before I bought the Yamamoto. I thought it matched up very well. I have seen them for sale here at pretty reasonable prices.