![[-]](https://theultimatetone.com/images/collapse.png "[-]")
02-14-2026, 09:13 PM
Hi Guys
The control on the rear panel is called "Output Tubes Matching" and just alters the balance of current NOT the median value of current. There is a 3k3 to ground off the wiper of this control. You could change this to 4k7, say, (which might be too cold), or lift one end and add a 10k pot in series with it to give actual variable bias.
Good luck
The control on the rear panel is called "Output Tubes Matching" and just alters the balance of current NOT the median value of current. There is a 3k3 to ground off the wiper of this control. You could change this to 4k7, say, (which might be too cold), or lift one end and add a 10k pot in series with it to give actual variable bias.
Good luck
