FDP Forum / What is internal bias?/ 4 messages in thread.

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jtheissen



Montana

no hitch in my git along yet
Nov 14th, 2017 11:55 AM        

My 59 Bassman RI LTD literature says it has internal bias, meaning????? No bias adjustment is needed for a tube swap? Thanks.



surfdog

Contributing Member
*

Lakeside, CA

Jim
Nov 14th, 2017 01:19 PM        

Bias adjustment is needed. The BMRI had no bias adjustment. The bias adjustment only applies to the 6L6 power tubes.



carsten



on the rhine

Nov 14th, 2017 02:39 PM        

Hi jtheissen!<br /> <br /> The early Bassman-Reissues didn´t have bias-pot (internal bias), but I´m almost sure, they incorporated it when the amp was "re(v)amped" into the Bassman LTD.<br /> <br /> It is a good idea to have your bias adjusted to the power-tubes you use - and that´s what your bias-pot is for.<br /> The bias-setting determines how "hot" or "cold" your power-tubes work and it has an impact on the sound of your amp, as well as the life-span of your power-tubes.<br /> If it´s set too cold, the tubes will last longer, but your tone may suffer, if it´s set too hot, your tubes may suffer - if it´s set WAY too hot, your tone may suffer, too ;-)<br /> <br /> If you don´t want to be bothered with this - I think Fender offers replacement tubes that are selected to suit your amp, so you won´t need to re-bias.<br /> <br /> cheers - C.



jtheissen



Montana

no hitch in my git along yet
Nov 14th, 2017 02:52 PM        

Thanks, fellas!



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