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In Reply to: RE: Some times less is more ........ posted by vinnie2 on September 15, 2014 at 10:52:14
The schematic does not give a value for the grid resistor. Is there a preferred value?
John
Follow Ups:
Went and did a little research and that is a grid stop resistor and the 47k I used is too high. Suggested values are 1k or less. I will give that a try and see if it makes any difference.
It's usual for the grid stopper to fall in the 100 to 1000 Ohm range when used on tubes that tend to oscillate in the very high frequencies. I don't know if the EL84 has such tendencies. If not, then you could possibly omit the grid stopper. Alternatively, grid stoppers in the range of 10K to 50K are used for dc blocking purposes and is seen mostly in guitar amps where things are often overdriven.
I wondered about that too. I made a WAG that he used 47k for both those resistors as they are tied together, and just used the one label. It worked fine as I could tell, but maybe someone else can tell us both what it really should be? Better still would be if someone could explain how we could calculate it so we can learn something to boot.
Edits: 09/16/14 09/16/14 09/16/14 09/16/14 09/16/14
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