How do I bias my amp?

[Venomboy]

When it comes time to get new powertubes for my Framus Cobra, I'd like to try biasing the amp myself. What equipment do I need? Is there something to plug into the tube sockets? I know my amp has a trim pot inside for biasing. Anyone have step by step instructions? Thanks! The only info I've received from other useless forums is "buy a probe and do it yourself!".

[zeegler]

Re: How do I bias my amp?

http://cgi.ebay.com/ws/eBayISAPI.dll...sPageName=WDVW

I need to get me one of these. As for the procedure, someone posted it here last week. I'm sure a search will turn something up.

[Venomboy]

Re: How do I bias my amp?

Cool. Thanks!

[lerxstcat]

Re: How do I bias my amp?

Tell it that it is superior to other amps, and that all its problems are due to all the inferior amps fukking things up. [img]/images/graemlins/laugh.gif[/img] Sorry, I had to say it!

[JonnyJobe]

Re: How do I bias my amp?

[ QUOTE ]
Tell it that it is superior to other amps, and that all its problems are due to all the inferior amps fukking things up.

[/ QUOTE ]

Wow, I guess I've already properly biased my amp and didn't even know it.

[GodOfRhythm]

Re: How do I bias my amp?

Chances are, if you need to ask that question, you better not try it yourself.

[Venomboy]

Re: How do I bias my amp?

I already told my amp it has mojo, so that's the first step in getting it biased.

[Shawn Lutz]

Re: How do I bias my amp?

C'mon... Everyone doesn't need to take an amp in for biasing. With a volt meter, common sense one should be able to do it. Are there any sites that list this process in a step by step procedure for the various amp heads.

[ZuliaArmy]

Re: How do I bias my amp?

I would also like to know how to do it, myself.

[Endrik]

Re: How do I bias my amp?

There is something here http://www.eurotubes.com/euro-i.htm#4.
But my English is bad, so I don't understand it completely.
Could somone post more links or tell how it is done.

[Shotgun]

Re: How do I bias my amp?

The entire Geofex site is cool, but this is useful re: bias -

http://www.geofex.com/tubeampfaq/TUBEFAQ.htm#bias

Keith

[taxistationary]

Re: How do I bias my amp?

Well, if your amp has an adjustable bias pot in it, then it makes it pretty easy. Just get a bias probe and measure it with a voltmeter. Usually with trim pots, the manufacturer sets up a bias range so that you can pretty much do it by ear. That still doesn't meen to turn the pot all the way to one extreme and not harm the tubes. If I were you, I would do it by ear, but still look up an aceptable range to go by, depending what tube types you have. That's what it is all about as far as biasing with a trim pot, to me.