This is prototype version, only 100V input is available.

OTOMON LAB VT-62 drive 811A/808/100th compatible SE tube amplifier , dynamic coupling

Driver tube is VT62/VT25, dynamic coupling method to drive power tube.100th, 811A, 808

What is dynamic coupling ?

Dynamic coupling method is using current in drive tube to drive the grid of power tube (bias), the current in grid of power tube will decide the current flow in driver tube dynamically, and the current flow in driver tube will decide the bias to power tube. So as the bias is dropped, the current in driver tube will be raised, but as the current of driver tube is raised the current in grid of power tube is raised follower, and the bias will be raised. It makes the bias of power tube always stabilized and the sound is stabilized too.

This method helps driving power tube with much of current so it will make the low frequency of amplifier is very well balance.

Specification:

Response frequency: 16Hz ~ 45KHz
Hum level: 0.3mV
THD : 811A: 13W, 808: 9W, 100th: 8W @ 5%

Sound of the amp is great with dynamic and powerful low frequency, musical and very detail.