OTOMON LAB 811A PP tube amplifier , dynamic coupling * output 36W

Driver tube is EL-34/6L6 x 2, dynamic coupling method to drive power tube.

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: 10Hz ~ 50KHz
Hum level: 0.8mV
THD : 36W @ 5%

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