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| Guitar Amps General discussion about amps |
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01-01-2008, 11:20 PM
| #1 |
| Junior Member Join Date: Jan 2008
Posts: 1
| JCM800 50 watt lead series/bias adjust
Hi, please forgive my ignorance. I want to change tubes on my amp. There are two 6550`s and three 12ax7`s. I want to Re Bias...Where do I put the probes of my meter and what are my bias numbers?...I really need my hand held on this one Thanks.....
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02-06-2008, 02:22 PM
| #2 |
| Senior Member Join Date: May 2007 Location: SW Florida
Posts: 336
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I recommend reading a good article before adjusting bias. The simplest method is to put in 1 ohm resistors and measure to the cathode voltage of each tube. The current depends on the plate voltage of your amp. Here's a fantastic page for bias settings http://www.webervst.com/tubes/calcbias.htm
__________________ See the birth of a 2-watt tube guitar amp - the "Dyno Tweed" http://www.naturdoctor.com/Chapters/Amps/DynoTweed.html |
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