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Which cathode resistor for 6L6 Champ?

3/30/2006 12:24 AM
Peter Which cathode resistor for 6L6 Champ?
which 6_L_6 cathode resistor value would be appropriate for a 5F1 Champ to bias it correctly between cutoff and saturation?  
The B+ with a GZ34 is approx. 378V or 405V (depending on which PT tap I use).  
The PT and OT can handle 6L6 tubes, impedance will be correct.  
3/30/2006 8:16 AM
Mark Burness
I'd start with the stock 470ohms but at 10W(or better). You'll want a higher voltage rating on the cathode bypass cap too, I'd go with 100v and keep it a fair distance from the cathode resistor to be on the safe side.
3/31/2006 3:28 AM

I just built what I call a Thunderchamp for my daughter and it runs 6V6/6L6/EL34 Tubes. Basically a Beefed Up 5F1 Circuit with a Spitfire Front end and a Master Volume to keep her mom happy. I use a 470/5 as the main RX and parallel a 1K/5 on a Switch that gives about 320 ohms when combined. B+ with with a Hammond 270DAX/SS Recto is 375 with a 6V6 at Low Power (470 Ohm RX) and 370 with a JJ EL34L at High Power (320 Ohm RX.) I haven't tried a  
6L6 in it yet (out of em) but I imagine the B+ will be right in between.  
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