SANSUI B-209 The Tube

Commentary

Vacuum tube power amplifiers that are hand-made by skilled craftsmen.

In the development of the B-209, George Kaye, who designed the vacuum tube analog section of the A/D converter used for recording chess key records, was employed as a key person. Moreover, major high-quality parts such as vacuum tubes, capacitors, and Dale resistors are also available in the United States under George Kaye, and Sansui's amplifier technology and George Kaye's vacuum tube amplifier technique are combined at a high level.

The vacuum tube uses 6L6GC push-pull, which is easy to obtain as used for AU 111, for the output tube, and uses 5U4G for the rectifier tube, 6SL7 for the input tube, and 6SN7 for the driver tube with DC ignition. Thus, excellent acoustic S/N is obtained.
In addition, we have solved the problem of natural vibration caused by the whole base board by using hand-made wiring without using a base board.
Internal wiring with silver plated wire and main wire with Teflon coating are all direct wiring.
The ground wiring is a one point grounding method to control the correct operation of the electrical circuit.

The power supply section uses a power transformer with a margin of 150% and a 1200 μ Fx2 filter capacitor used by Sprag.
In addition, the coupling capacitor uses a Kimber cap, the output transformer uses a combination of OFC material and special wax filler, and the power supply part is placed in the center in a symmetrical layout to minimize the signal path and achieve the optimum weight balance to control the generation and transmission of vibration.

It is made with thorough attention to the finish of the appearance.
The front panel is made of a combination of natural natural rosewood and champagne gold pearskin of up to 14 mm thick, aluminum bonnet and double bottom chassis.
The operation knob uses a brass-cut processed base with a inlay finish, and the "Sansui" logo mark carved on the front panel has letters carved on the panel and embedded -cast surface after panel engraving.
In addition, the model name of center wood panel is a polyester satin finish with inlay letters.

The mounting socket of the vacuum tube has a ceramic body and uses silver pins.

Gold-plated input terminal is used, and the output terminal supports banana plug.

Equipped with connector type gold-plated plug AC cord.

Left and right independent motion volume.

Equipped with input terminals for 2 variable systems and 1 direct system.

Model Rating

Type	Stereo power amplifier
Rated output	30W + 30W (4 Ω ~ 8 Ω)
Total harmonic distortion factor	0.5%(1W)
Frequency characteristic	5 Hz to 50000 Hz (1W ± 3 dB)
Input sensitivity	Variable : 220 mv Direct : 500 mv
Input impedance	100k Ω
Pwer	100 VAC, 50Hz/60Hz
Rated power consumption	200W
External dimensions	Width 445x Height 190x Depth 445 mm
Weight	24.5kg