Maintenance has been completed, including 6 capacitors, 2 input ASSY replacements, and vacuum tube socket caulking repairs! Changed to Japanese specification 100V. A mono power amplifier for broadcasters developed at the North West German Broadcasting Center. The tone is quite thick, supple, and soft. It's a model I'd like to try with Old Tannoy, Quad ESL, Eurodyne, etc. There is rust, dullness, etc. over time ※ Vacuum tube F2a11 1 guide pin is broken, but there is no problem with performance. Input impedance: 600 ohms (ambala), output impedance: 4 ohms (Oikawa Tetsuji)
Maintenance Information: 2026.5.31 Maintained (◎ Common Electrolytic Capacitor 33 μF Made in Other Countries → 3 x 2 · Input ASSY Replaced with Our Product 1 x 2 · AC Code 3P → 2P Connector Added 1 x 2 · Vacuum Tube Socket Caulking Repairs ※ Other Operation Checked (23 to 26 W with rated output AC100 to 110V, measured at SP: 4 Ω) * Input impedance: 600 ohms. Please go to BIAS at AC100V near the front of the green line. ※ No. 731 vacuum tube F2a11 1 guide pin is broken, but performance is not affected. (*The No. 808 panel screw fixing washer is missing, so the screw will come off)
Accessories: XLR/RCA conversion cable, power cable
Main specifications: 100V F2A11 push-pull effective output 40w (8Ω) vacuum tube F2A11 x 2, EF804 x 2 W522 x H171 x D290 mm 13.5 kg (actual measurement)