"Very interesting on the 3-500z. Never heard of it so I looked it up
http://www.rfparts.com/tubecomp.html They are expensive so whats the supply like and any new replacements for the future. How much would an amp like this cost?"
This tube is rated for audio service.
Some Spec's for a Push-Pull Audio Amplifier:
Plate Voltage ................................. 3000 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 244 mA
Amplification Factor .......................... 160
Plate Current (Zero Signal) ................... 600 mA
Plate Current (Maximum Signal) ................ 1540 mA
Driving Power ................................. 25 W
Load Resistance ............................... 8600 Ω
Power Output (approx) ......................... 1420 W
I would run this in class AB1, so the output power would be around 800-900 watts per channel.
This is going to be developed sometime, but could be done immediately if someone wanted one soon. Amplifier weight is estiamted to be around 400lbs total and will have to run on 240v. It will consist of 4 rack-mount enclosures, two for the audio amps and two for the power supplies. Estimated cost is $35,000. All components will have to be specially made, down to the enclosures themselves. Naturally, it will be shipped via a freight service.
A single ended version is estimated to cost $15,000 and will use a two chassis system and can run on either 120v or 240v.
Note: The 240v units will work in the USA, naturally. You would have add a dedicated line from your breaker box. A 15 amp service wouldn't be difficult to install. I used to run a 1KW HF Amp on one and it worked great.