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Vintage threads from the first ten years

Cathode Bias / Fixed Bias Switch

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3/15/2002 2:53 PM
Dave B.	Cathode Bias / Fixed Bias Switch I'm in the process of building a tweed deluxe sort of amp. I also love the sound of the brown princton   which is almost identical but with fixed bias.     Has anyone tried bias switching on a tweed deluxe   ? Any preferences?     DB

 

3/15/2002 3:46 PM

Bruce /Mission Amps

I have.   IMHO, in this 5E3 circuit, I think the cathode bias sounds the best... plus the B+ voltage rises about 20vdc when you switch to fixed bias.     The brownface Princeton has:   1.) fixed bias...   2.) a totally different volume control   3.) a single channel (no interactive volume pots)   4.) vibrato/trem   all four of which completely changes the way the amp sounds and feels when being played!   It's a great sound, as is the brownface Deluxe, but they are different amps.     Bruce

 

3/15/2002 3:50 PM
Bruce /Mission Amps	Forgot the other thing!! 5.) The Princeton (along with the brownface Deluxe) also has negative feedback!!     Bruce

 

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