OTOMON Laboratory　(音門ラボ)/Product details page

Special order made based on Valve World amplifier schematic, dynamic coupling using driver tube 5998A. Output transformer is special order made, primarr can be handle current up to 250mA

100th tube is very powerful transmission tube for audio. This tube will be best for audio as grid bias is about 42V, at this bias, plate current is over 135mA, grid current is 28mA. It is very difficult to make amplifier using this tube as single end. Almost amplifier using this tube is working as push pull mode.

Almost transformer in market can be handle current under 100m, so to handle this tube, a special order transformer is need. Transformer on this amplifier is special order made from Tango, which can handle up to 250mA, it is the most powerful OPT I have seen, primary is 2.5K ohm.

To drive this 100th tube, we use 5998A tube, haft is for secondary tube, half is for drive 100th tube. Primary is using 310A tube, rectifier is 5u4G tube.

100th tube is very powerful tube, heater need 5V with 5.2A, it is very difficult to find a transformer with this spec, Valve World did use switching transformer to use for heater but switching transformer make the sound very bad. In this amplifier 2 big Triad transformer using separately for heater, only 2 heater transformer is about 15kg. Power transformer is HIrata Tango. Choke transformer is very very big UTC S-33. Power supply is separately with amplifier block. Power supply is about 28kg, amplifier block is about 20kg so this amplifier will take much shipping fee.

Speaker protection delay was used.

All tubes except 100th tube are included.