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

[javacody]

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

[Johan]

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

[javacody]

Thanks for the help Johan!

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