Driver tube is 2A3, prestage tube is 417A. No NFB (switch let customer use NFB -3db, very little for another music enjoy) Very wide range, rich and beautiful bass sound as characteristic of O. C (OTOMON Ultimate Direct heat tube Drive Circuit, detail in OTOMON LAB website) Response frequency is flatted from 20Hz at 28W of power. This is impossible thing as using interstage transformer to drive triode tube. I used the same output transformer in schematic using interstage transformer, at 28W, from 20Hz to 60Hz, it drops 3.5db.
Specification: No NFB mode Output : 2830W. Noise : under 1mV Response frequency: 20Hz35K Hz (flatted) at 28W 16Hz 55K Hz(-1db) Distortion: 0.2% 1W 5% 28W Can be match with almost speaker, and all genre of musics.Detail and Powerful sound, very rich of low frequency with musical sound. Generally, I dont response to question ask about what is your best price, you can press best offer button and input your best price. If there is no best offer button then item is fixed price. If you want to find any item related to audio turntable, audio vintage or amplifier, and you can not see in my listing, please ask me via message, I can help you find it. If you want to know about me, you can search on google with key word "Otomon Laboratory" //////////////////////////////. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps". The seller is "soundgate_net" and is located in this country: JP. This item can be shipped worldwide.