Lightly used pair of Sean Casper F2A mono blocks built in Klangfilm enclosures and using premium parts.
I am the original owner bought directly from the builder and would say they aren't even broken in fully. Have less than 50 hours on them.
Down scaling my entire system and I doubt I will find these again as I don't believe they are still in production.
These amps knocked out my 45 SET amp, my 421A amp (from the same designer) and even my Welborne DRD 300B amps. Matched them with my Shindo preamp (also for sale) and they produced heavenly music.
Here is the designers description:
Custom made, hand built, point to point wired amps use only the finest quality audiophile grade components. I used original Siemens Klangfilm metal chassis made in Germany in 1950s for the frames. Klangfilm was built to professional broadcast and cinema standards in German rack mount dimensions.
My design is a 2 stage Single ended amp using the 12AT7/ecc801 for the input stage. The amp is currently setup for 8 ohm operation. Frequency response is 20 Hz to 100 kHz +/- 1 db at 1 watt, tested on a Hewlett Packard audio analyzer. The resistors are a combination of original red Klangfilm/Siemens, PNP, Dale, and Mills. Original ceramic German tube sockets for the F2A power tubes.
Price doesn't including shipping costs nor paypal fees if you choose to pay that way. I prefer USPS money orders.