H
hopkinWFG
Well-known member
wonder if anyone has the official vht pittbull ultra lead biasing sheet? am looking to do a biasing and wonder whats the recommended ?mA per tube ?
R
Racerxrated
Well-known member
Not sure about your amp but the Deliverance has recommended biasing inside the chassis next to the bias screw. I'd imagine your amp has the same? Good luck!hopkinWFG":3tbmpram said:
S
sjk
Banned
New member
Open your amp up and using a multimeter (with a higher than 500v max) set to max volts ground the black probe (ground) to the chassis and touch the red + probe to pin 3 of one of one of the powertubes and that will give you the plate voltage in Volts. Looking from inside your amp pin 3 is the pin 3rd from the right of the slot or tube guide pin. Be very carefull this stuff is very dangerous if you are not experienced.
Once you know your plate voltage set each tube somewhere between 60 and 70% using this a forumula from a website such as this one, just punch in your numbers and tube type.
http://www.ax84.com/biascalc.html
Once you know your plate voltage set each tube somewhere between 60 and 70% using this a forumula from a website such as this one, just punch in your numbers and tube type.
http://www.ax84.com/biascalc.html
311boogieman
Well-known member
^yep
And if you've never biased an amp before this tutorial will give you some detail and safety tips. I personally recommend a bias probe from Weber.
http://splawnfans.proboards.com/thread/ ... g-tutorial
http://www.tedweber.com/gadgets/bias-rites
And if you've never biased an amp before this tutorial will give you some detail and safety tips. I personally recommend a bias probe from Weber.
http://splawnfans.proboards.com/thread/ ... g-tutorial
http://www.tedweber.com/gadgets/bias-rites
