Hi, I just got a Weber Bias-Rite for setting the Bias on my other non Mesa amps. For kicks I measured the Voltage and Cathode Current on my T-Verb DR. Something looks very strange to me.
On Spongy and tube Rectifier: 350 plate Volts and 9 ma cathode current.
On Bold and Tube Rectifier: 420 plate Volts and 13 ma cathode current.
On Bold and SS Rectifier: 450 plate Volts and 20 ma cathode current.
The volts look fine for 6L6s but the cathode current is way low in my opinion. I know Mesa's are biased "cold" but this is out of spec for 6L6s isn't it ? 20ma should be at the low end not the high end of the scale.
The tubes are not fresh but even old tubes would not drift so bad out of spec would they ?
Any of you check your bias readings ? What did you get ?
On Spongy and tube Rectifier: 350 plate Volts and 9 ma cathode current.
On Bold and Tube Rectifier: 420 plate Volts and 13 ma cathode current.
On Bold and SS Rectifier: 450 plate Volts and 20 ma cathode current.
The volts look fine for 6L6s but the cathode current is way low in my opinion. I know Mesa's are biased "cold" but this is out of spec for 6L6s isn't it ? 20ma should be at the low end not the high end of the scale.
The tubes are not fresh but even old tubes would not drift so bad out of spec would they ?
Any of you check your bias readings ? What did you get ?