Would a bad tube still read the proper bias?

[chcjunior]

Assuming the bias was set properly in the first place, of course.

 

[STRATDELUXER97]

Re: Would a bad tube still read the proper bias?

Assuming the bias was set properly in the first place, of course.

Are you taking readings off the cathodes of your output tubes or your actual bias voltage on Pin 5? Is this a 6L6/EL 34 amp?

 

[chcjunior]

Re: Would a bad tube still read the proper bias?

EL34 amp using a bias meter (which I believe is using Pin 8)

 

[Gearjoneser]

Re: Would a bad tube still read the proper bias?

Yeah, because the bias meter will tell you that it's doing it's job, but won't tell you if it's about to blow, or is weak sounding, or or microphonic. In those cases, you'll have to use your ears, and also do the pencil trick......turn the amp up, and lightly tap each tube.

 

[STRATDELUXER97]

Re: Would a bad tube still read the proper bias?

EL34 amp using a bias meter (which I believe is using Pin 8)

Pin 8 is the cathode on your amp...

 

[chcjunior]

Re: Would a bad tube still read the proper bias?

Pin 8 is the cathode on your amp...

When it comes to tube amps, each question yields an answer. I'll be back after I go look up cathode. :smack: