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previous: gt I need to convert 5E3 circuit to EL... -- 7/18/2000 11:45 AM	View Thread

Re: EL84 in 5E3 circuit?

7/19/2000 4:42 AM
Steve A.	Re: EL84 in 5E3 circuit? Giacomo: I was told that EL84's get ugly sounding if you put more than 17vac on their grids. You might try adding something like a 150k "cross-line" resistor between the outputs of the power amp coupling caps (right where they meet the 220k grid load resistors). If the sound is too bright you could add something like a 500pF to 1200pF cap in parallel with the 150k resistor. YMMV so you might need to experiment with these values... --Good luck! Steve Ahola P.S. Take a look at this picture from the 2/97 issue of GP. See the "V" with the twisted blue and green wires (which go to the grids of the EL84's)? To the right of the big PS filter caps... " target="_blank">http://www.ampage.org/blueguitar/drz_rxcb.jpg">

7/19/2000 4:42 AM

Steve A.

Re: EL84 in 5E3 circuit?

Giacomo:

I was told that EL84's get ugly sounding if you put more than 17vac on their grids. You might try adding something like a 150k "cross-line" resistor between the outputs of the power amp coupling caps (right where they meet the 220k grid load resistors). If the sound is too bright you could add something like a 500pF to 1200pF cap in parallel with the 150k resistor. YMMV so you might need to experiment with these values...

--Good luck!

Steve Ahola

P.S. Take a look at this picture from the 2/97 issue of GP. See the "V" with the twisted blue and green wires (which go to the grids of the EL84's)? To the right of the big PS filter caps...

" target="_blank">http://www.ampage.org/blueguitar/drz_rxcb.jpg">