#2
I got the $25 dollar bias probe from here v and a Digital Multimeter from radio shack. They also sell the Weber Compubias which allows you to plug in two tubes at a time and has a built in meter but it is $120.

https://ssl.eurotubes.com/cart/index.php?page=view_products&category_id=108&sub_category_id=109


http://my.ultimate-guitar.com/main.php?mode=blogs (see my bias tutorial)
#6
It really is not that hard. That blog is overly detailed for a reason. The actual work itself is pretty easy. As long as you follow the safety precautions you can do it safely yourself. Where is the bias trim pot in your amp?
#8
Quote by moominman2
I have a Laney AOR 50w combo.

What should I look at buying so I can bias the amp myself?

Is it difficult?

How many times should I check them?

Thanks! Luke


To electrocute yourself? No it's quite easy. Careful bro.. 500-600 volts in there.
#9
well, it may be external - which would save a lot hassle. If it is internal then be careful like I said. Tube amps can hold deadly voltages even after the amp has been turned off for a while. Some amps have bleeding resistors to 'bleed' off any excess voltages but you still have to be careful. Use a chopstick or pencil if you feel the need to poke around.

Biasing a Fixed bias amp can be dangerous because the amp has to be turned on in order to bias it.

PM me or report back here if you have any questions.
#10
^^^ Hi 311, how you doing man?

Those external bias checkers on the rear of my Peavey XXX are useless. Not recommending this method but I just stick the power tubes in there and crank the bias trim until it sounds good.. most of the way up. Hell, all it can do is blow up right?
#12
Quote by BobDetroit
^^^ Hi 311, how you doing man?

Those external bias checkers on the rear of my Peavey XXX are useless. Not recommending this method but I just stick the power tubes in there and crank the bias trim until it sounds good.. most of the way up. Hell, all it can do is blow up right?

Hey Bob

Speaking of blowing things up, keep your eye open for my latest Thread updates - still to come yet today.
#13
Biasing is easy once you know how to do it. It looks way complicated at first, but it's really simple. There's a video at eurotubes.com that shows you how to do it (look for the "general" biasing video).

Just use tools with rubber/plastic handles and don't stick your hands in the amp-chassis (in other words, apply some common sense) and you won't kill yourself.

All you need is a bias probe and a multimeter. I got my probe from tube town, and it does what it's supposed to:
http://www.tube-town.net/ttstore/product_info.php/info/p471_Kit-Bias-Probe-Octal.html
http://www.tube-town.net/ttstore/product_info.php/info/p3132_Bias-Probe-Octal--assembled.html