Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

Which cathode resistor for 6L6 Champ?

3/29/2006 5:24 PM
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 1:16 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.
Book Of The Day The Ultimate Tone, Volume III by Kevin O'Connor
Have you ever wondered if there is a better way to build a Bassman, Champ, Plexi, an 800, AC-30, Bulldog or Portaflex? Or you wanted to build an SVT with off-the-shelf parts? How about a master-volume amp that doesn’t change tone with the master setting? Everything you need to know is right here, including: proper grounding techniques, wiring methods, and mechanical considerations. Eighteen chapters cover the “iconic” amps everyone knows and loves, with schematics and layouts for each, along with the technical history of the product. Eyelet-board and chassis-mounted tube socket construction is used throughout, for easy servicing and modding. TUT3 is very accessible even if you cannot fully read a schematic and is a "must have" if you are going to build an amp for your self.

Note: The Ampage Archive is an Amazon Associate site. A small commission is paid to the site owner on any qualified purchase made after clicking an associate link such as the one above.
3/30/2006 8:28 PM

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.  
   Page 1 of 1