#1
first of all, i know next to nothing about the workings of amps. including what this biasing thing is.
but i was wondering why some amps need their power tubes biased, and other amps are just plug-and-play?
#3
Amps that have had their tubes replaced with the same type and brand of tube usually do not need to be biased.
#4
different types of biasing circuits work different some are fixed and not adjustable some are cathode bias and some are anode bias
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#5
so let me see if i got this right
some tube amps need biasing, because they need to be biased, and other tube amps don't need to be biased because they don't need to be biased.

i never knew it could be so simple
#6
Good question. Having established that different amps use different circuits and types of bias, why do some need to be biased and some not?
#8
A cathode biasing circuit adjusts its bias internally so the circuit itself does the biasing when you throw in some different tubes.

A fixed bias is just that: the bias is fixed unless changed from someone. The circuit does nothing by itself and these are the amps that need to be biased.
#9
Quote by stoic
Amps that have had their tubes replaced with the same type and brand of tube usually do not need to be biased.

I wouldn't say that. Everyone needs to check their manual and/or what the manufacturer recommends. There are some good readings on the webz. Can't link now.
#10
Quote by sethp
so let me see if i got this right
some tube amps need biasing, because they need to be biased, and other tube amps don't need to be biased because they don't need to be biased.

i never knew it could be so simple


yeah that's basically it

cathode biased normally don't need to be biased.

Fixed (adjustable) generally do.
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#11
Quote by sethp
so let me see if i got this right
some tube amps need biasing, because they need to be biased, and other tube amps don't need to be biased because they don't need to be biased.

i never knew it could be so simple


yup you got it.

any other questions?
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