Hey all,
I've been a happy owner of a Haze 40 Combo since Oct. of 2009. Lately I've been having some issues, after smelling that telltale "plastic burning" smell at a gig last week, and I opened up my amp to check it out.... seemingly nothing wrong no pots/caps/resistors looked burned out. A little silicone drip from the input jack so i thought that it maybe heated up and dripped onto a hot tube or speaker housing. No residue anywhere and i check the jack/tighten it up, that's fine. Anyway since it's open i figure i need to change power tubes (it's been 3 1/2 yrs!!!) so i get a set and my trusty bias tool (asharp BiasPro and octal adapters).....
Here's the problem...
When i first plug in VR1 is around 35mA, but VR2 (tube farther away from the pre tubes) reads -0.9mA???? This is on my old tubes.
So i put the new tubes in and check the bias.
Sooo i'm getting a reading on VR2 that ranges from 0.1 to -2.3mA (from pot min to max), VR1 was 11.1-14.7mA (min to max) with VR2 at min. With VR2 at max VR1 reads 141-165mA(min to max). From what i've been looking for on forums online here, the power tubes are supposed to be bias-able independently and are suggested at around 39mA each.
Anyone have any clue what's going on here? And any suggestions? I am fairly new to biasing but not to repair and modding in general.
Any help would be appreciated!