biasing

[Taz]

If I replace my blown power tubes in my VH4 with the exact same brand and model tubes, is it necessary for me to get my head biased?

 

[duesentrieb]

yes.

 

[King Crimson]

yes.

 

[bananaladonpcp]

Same brand and type doesn't mean anything. Thats why you buy a matched quad. They are all rated different and have different output. Have your amp biased shouldn't cost you more then like $60USD at the most. Last time I got an amp biased I paid $20 for it. Since then I have learned how to do it myself.

-Alex

 

[cardinal]

How do you do this on the early VH4's with no bias trimmer?

 

[bananaladonpcp]

How do you do this on the early VH4's with no bias trimmer?

Isn't there one inside the amp?

 

[cardinal]

Nope. My '07 had one. This one doesn't.

 

[MOOSEHEADS]

No bias trimmer untill late 97-98 I think.

Tubes were better back then.

I would like to see a pic of this amp and dibs.

 

[elfredoo]

every amp except those with fixed or auto-adjusting bias (mesa boogie, hughes&kettner) should have a bias trimmer!

 

[Peter Diezel]

Sorry for my early mistakes

 

[elfredoo]

hehe, really? what do you do when you have to swap tubes? soldering new resistors? just curious....

 

[i.ak]

hehe, really? what do you do when you have to swap tubes? soldering new resistors? just curious....

Correct elfredoo. On amps you do not have bias trimmer, one should select a set of tubes that get you close or far enough and change the resistor. I would describe bias trimmer to be more-or-less equivalent to "adjustable resistor".

 

[slyvren]

Sorry for my early mistakes

Nothing about the vh4 was EVER a mistake. It got you where you are today and those early amps blessed our ears with some of the best sounds we have ever heard! Let us call it a 'Learning Experience'.

 

[elfredoo]

crazy stuff...

 

[King Crimson]

Tubes were better back then.

So were gas prices...

 

[King Crimson]

Sorry for my early mistakes

Stop it Papa - You are incapable of making a mistake - it is well documented!