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Egnater Mod 50 problems

Miles Long

Member
Messages
1,178
There is a light by the bias points in the back of the amp on the left side that says tube failure. I replaced the output tubes and the light is still on. The amp breaks up on the clean channel with a harsh sounding distortion. Phase inverter perhaps?
 

WaltC

Member
Messages
2,129
When you replaced the output tubes did you check/adjust the bias on the new tubes? If not, then they can be enough out of "whack" to give you the indications you're getting. If you did and you still get the error, then it is very possible that something in the amp has failed (screen resistor, something in the bias circuit, etc.) and needs to be repaired.

Probably time for a trip to the amp doctor.
 

Pat Healy

Senior Member
Messages
10,952
Have you called Egnater? Bruce was very helpful in working through some problems with my Mod50.
 

Miles Long

Member
Messages
1,178
When you replaced the output tubes did you check/adjust the bias on the new tubes? If not, then they can be enough out of "whack" to give you the indications you're getting. If you did and you still get the error, then it is very possible that something in the amp has failed (screen resistor, something in the bias circuit, etc.) and needs to be repaired.

Probably time for a trip to the amp doctor.
Yes, the bias is 23 ma. Maybe a fuse? I'm not the most tech saavy, lol.
 

WaltC

Member
Messages
2,129
23 ma is pretty low even for 5881s. Something closer to 32-38 ma (assuming around 430V on the plates or so) would be more like it. It's possible if you bring the bias up to that range that the light will go out. I've not worked on that model Egnater, but Bruce is very helpful and I'm sure he'll point you in the right direction.
 




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