- Amps [BG]
|MetroBass ||01-18-2014 08:02 PM |
Trouble with Bassman 100T?
I primarily use this for a practice amp but today I allowed a friend to use it at a gig. As a practice amp I run it at the 25W setting and have never had any problems, however, we switched it to the full 100W for his gig.
When we did this the auto biasing would not lock in. We finally got it to respond and when it did I get a red light, two greens and an orange. Amp definitely doesn't feel like it's delivering 100W. Do I need new tubes?
I did notice that the power tube closest to the left from the rear was glowing extremely orange.
|Downunderwonder ||01-18-2014 08:52 PM |
Manual probably says something along lines of "when light glows X, replace tube".
|coreyfyfe ||01-18-2014 09:10 PM |
Take it in for service. If the tube was glowing orange (ie plates glowing and not just the heaters) you can have other issues that should be checked to prevent damaging more tubes. Also have them check the bias circuit, apparently that circuit has been a bit of a problem for people.
|Moosehead1966 ||01-18-2014 10:19 PM |
Try a new 6L6. As the manual says, it should bias and settle in. If not, that's where the work begins. Do a search of related threads.
|MetroBass ||01-18-2014 10:26 PM |
Thanks - I have Wing Cs in there but still have the original JJs I'll try tomorrow to see if it biases.
|MetroBass ||01-19-2014 07:04 PM |
Put one of the JJ I had laying around - problem fixed. Looks like Winged C are no longer being made and there's a huge mark up now - $40 /tube.
So.....this is an example of the autobias circuitry behaving exactly as it should and working to the advantage of the player......:D :D :D
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