Print Page - OT How do you know if your amp is cathode biased?

Title: OT How do you know if your amp is cathode biased?
Post by: javacody on August 07, 2004, 03:18:51 AM

I have a 64 Gibson Skylark, how do I know if its cathode biased?

Here's the schem (straight from Gibson, nice buncha guys workin for them):

http://www.mycgiserver.com/~javacody/ga5_crest.pdf

Title: OT How do you know if your amp is cathode biased?
Post by: Johan on August 07, 2004, 05:39:32 AM

if the grid is tied to ground instead of a negative voltage and the cathode is raised from the ground either by a cathoderesistor or is tied to a positive voltage ( rare but look at musicman for example ) then it is cathode biased.
your amp is a good example of a cathodebiased amp. the grids are tied to ground with the two 220k resistors and the cathode is raised from ground with the 270ohm resistor

Johan

Title: OT How do you know if your amp is cathode biased?
Post by: javacody on August 07, 2004, 12:29:07 PM

Thanks for the help Johan!

What makes a resistor tied to ground as opposed to raised from ground?

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DIY Stompboxes => Building your own stompbox => Topic started by: javacody on August 07, 2004, 03:18:51 AM