Do you re-bias your amp after changing your power tubes?

Make it loud here.

Do you re-bias every time you change your power tubes?

Yes, every time.
14
70%
I don't, if I use a properly matched fresh pair
3
15%
Never, who cares if the amp still sounds great?
3
15%
 
Total votes: 20

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zhivago
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Re: Do you re-bias your amp after changing your power tubes?

Post by zhivago » Sat May 14, 2022 1:52 pm

johnnysomersett wrote:
Sat May 14, 2022 7:16 am
Whoop! Congrats!... A good hurdle overcome and a skill that'll be with you forever now - the best kind of learning experience.

I've found this useful ability to be quite handy in the help-friends-out-in-exchange-for-beers department...which is one of my preferred departments :)

Rock n roll.
8) 8) 8) 8) 8)
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hexes
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Re: Do you re-bias your amp after changing your power tubes?

Post by hexes » Mon May 16, 2022 11:40 am

high five on your bias success! it’s nerve wracking the first time, and honestly, when firing up the first amp you’ve built with one.

also, double warning on not working on amps too late (and never on substances). I hyper focus and go for hours, not noticing I’m tired. that’s how I got zapped with 600v DC off a PT rectifier winding, and I certainly knew better.

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Re: Do you re-bias your amp after changing your power tubes?

Post by zhivago » Mon May 16, 2022 12:34 pm

Many thanks! :)

Yes, I can see how working on amps while sober and/or well-rested is a definite plus!! :D
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Re: Do you re-bias your amp after changing your power tubes?

Post by øøøøøøø » Mon May 16, 2022 4:59 pm

hexes wrote:
Mon May 16, 2022 11:40 am

also, double warning on not working on amps too late (and never on substances). I hyper focus and go for hours, not noticing I’m tired. that’s how I got zapped with 600v DC off a PT rectifier winding, and I certainly knew better.
Exact same

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Re: Do you re-bias your amp after changing your power tubes?

Post by johnnysomersett » Mon May 16, 2022 10:41 pm

øøøøøøø wrote:
Mon May 16, 2022 4:59 pm
hexes wrote:
Mon May 16, 2022 11:40 am

also, double warning on not working on amps too late (and never on substances). I hyper focus and go for hours, not noticing I’m tired. that’s how I got zapped with 600v DC off a PT rectifier winding, and I certainly knew better.
Exact same
Ditto, also. 500v from an OR120 straight into the wrist woke me up pretty sharpish. Fortunately for me I was taking a drag off a cigarette at the same time so my left hand was well out the way of the chassis :D

Even though I know how to drain an amp down now, that very first *touch* inside, always gives my nerves a little flutter hahaha
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Re: Do you re-bias your amp after changing your power tubes?

Post by sessylU » Tue May 17, 2022 3:10 am

That's one of the general "being quite handy at things" lessons that you learn doing a lot of airfix kits as a kid.

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Re: Do you re-bias your amp after changing your power tubes?

Post by luau » Tue May 17, 2022 5:11 am

johnnysomersett wrote:
Mon May 16, 2022 10:41 pm
øøøøøøø wrote:
Mon May 16, 2022 4:59 pm
hexes wrote:
Mon May 16, 2022 11:40 am

also, double warning on not working on amps too late (and never on substances). I hyper focus and go for hours, not noticing I’m tired. that’s how I got zapped with 600v DC off a PT rectifier winding, and I certainly knew better.
Exact same
Ditto, also. 500v from an OR120 straight into the wrist woke me up pretty sharpish. Fortunately for me I was taking a drag off a cigarette at the same time so my left hand was well out the way of the chassis :D

Even though I know how to drain an amp down now, that very first *touch* inside, always gives my nerves a little flutter hahaha
When I first started tinkering I had my wife attach my left hand to my belt loop with a velcro strap. :D

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