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 Post subject: F-50 Tubes & Bias
PostPosted: Thu Jul 30, 2015 1:33 pm 
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Bottle Rocket

Joined: Thu Jul 30, 2015 1:26 pm
Posts: 1
If I change the 2 6L6's from say "red" to "green". Do I need to re-bias the amp to accommodate the new color code ?

Also. I know the F-50 has set bias. What is it ? and should I get the bias checked on the reg to make sure its still at factory setting.

Thanks.


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 Post subject: Re: F-50 Tubes & Bias
PostPosted: Fri Jul 31, 2015 10:34 am 
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Bottle Rocket

Joined: Sun Jul 19, 2015 1:36 pm
Posts: 5
If you are using Mesa branded tubes you should be good to go. Just plug them in. If you have lingering doubts a tech could probably check that the amp negative bias voltage is still where it should be. It would take a total of about 5-10 minutes on the bench so it should not be that expensive. I am rehabilitating a 50 Caliber at the moment built in 1989. Had to change out a few of the carbon comp resistors in the bias supply as they had drifted a little. Negative bias voltage was off a little bit. Put metal oxides in this time so that section of the amp should be good for many more years.


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