NOS Coppia, Tubi JAN Phillips 6U8A, Adattatori Au Pins per Sostituire Tubo 7199 Ecc.
Sound tested in my mono Amplifiers, superb! I’ve found these to be superb as an high fidelity audio phase splitter. Has very low microphonics and has perfect balance. low noise floor and low microphonics makes this an excellent solution.