Maintained! This is a rare Neumann mono power amplifier for projectors. The output was 400Ω, but a custom-made matching transformer was manufactured, and 4/8/16Ω can now be used! Moreover, the power supply can be used at 100V. The input is a straight RCA cable. I can strongly feel the lively sense of power, and the rich, well-structured German-like sound. This is an item I would like to combine with speakers made in Germany such as Siemens (Daiki Goto)
Maintenance information: Maintained (◎ common · 400Ω: 4/8/16Ω matching transformer added in custom-made work and made by ASSY 1 x 2 · volume cleaning repair · 10 μF other deterioration replacement 1 x 2 · negative feedback adjustment resistor 1 x 2 · SP terminal addition 2 x 2 · vacuum tube socket caulking repair ◎ No. 580224 · vacuum tube 12AX7 deterioration replacement (2026.4.27 supplies arrived)
※ Operation has also been checked with AC 100V (rated output measured at 28W SP: 8Ω) *Since this model is for microphones and projectors and has large gain, residual noise is also slightly larger. Please use the volume around the 4-5 scale. (Also, the fuse is labeled 1A, but please use 2A when using AC100V.)
Accessories: Speaker impedance matching transformer x 2
Main specifications: 100V specification Effective output: 28W (8Ω) W520 × H240 × D235 mm weight 14.4 kg (actual measurement)
RCA cable Neumann's RCA cable is famous in Germany. Recommended for those who listen to classical music on records. Since it is slender and soft, it is useful in a variety of situations. You can see the exterior, dullness, and feeling of use (Murakoshi Yoichi)
Maintenance information: 2026.6.14 continuity confirmed
Accessories: none
XLR cross cable 1.3 m pair Neumann RCA cable from the prestigious German family and familiar. Recommended for those who listen to classical music on records. Since it is slender and soft, it is useful in a variety of situations. You can see the exterior, dullness, and feeling of use (Murakoshi Yoichi)
Maintenance information: 2026.6.14 continuity confirmed
Accessories: none
RCA cable 0.9 m pair Neumann's RCA cable from the prestigious German family. Recommended for those who listen to classical music on records. Since it is slender and soft, it is useful in a variety of situations. You can see the exterior, dullness, and feeling of use (Murakoshi Yoichi)
Maintenance information: 2026.6.14 continuity confirmed
Accessories: none
RCA cable 0.9 m pair Neumann's RCA cable from the prestigious German family. Recommended for those who listen to classical music on records. Since it is slender and soft, it is useful in a variety of situations. You can see the exterior, dullness, and feeling of use (Murakoshi Yoichi)
Maintenance information: 2026.6.14 continuity confirmed
Accessories: none
RCA cable 0.5m pair Neumann's RCA cable from the prestigious German family. Recommended for those who listen to classical music on records. Since it is slender and soft, it is useful in a variety of situations. You can see the exterior, dullness, and feeling of use (Murakoshi Yoichi)
Maintenance information: 2026.6.14 continuity confirmed
Accessories: none
RCA cable 0.5m pair Neumann's RCA cable from the prestigious German family. Recommended for those who listen to classical music on records. Since it is slender and soft, it is useful in a variety of situations. You can see the exterior, dullness, and feeling of use (Murakoshi Yoichi)
Maintenance information: 2026.6.14 continuity confirmed
Accessories: none