Problem with Champ build

mario13 · 8th July 2011, 09:48 PM

I'm building a Fender champ style amp. Using a 6l6 instead of 6v6. The problem is the power I'm getting out. About .5 watts. I've checked the voltages on the 6l6 its 360v on the plate 345v on g2 the tube is drawing current around 50ma everything seems normal but no power or very litle I even tried a diferent OT same thing. I'm sure the problem is simple but i dont know were else to look. This is not my first champ build my other one puts out over 5w. I need some help please!
Thanx
Mario.

jjman · 9th July 2011, 01:36 AM

Schematic? Scope? Wrong NFB resistor?

What is the cathode voltage and resistor on the 6L6? What is the p-p voltage on the grid of the 6L6 before clipping/clamping is observed?

DigitalJunkie · 9th July 2011, 03:59 AM

Perhaps one of the earlier stages is goofy,and isn't sending enough signal to the grid of the 6L6? Just a random thought.

Wavebourn · 9th July 2011, 04:14 AM

Does it go from clean to dirty when you increase volume? Do you get low power on dirty sound?

mario13 · 9th July 2011, 07:44 PM

Thanx for the input guys! I found the problem was in my power supply, a choke with a high dc resistance that I shouldn't have used. Basicly it murdered my HT voltage. A silly mistake! Oh well a learning experience for sure!
Thanx again!
Mario.

8th July 2011, 09:48 PM	#1
mario13 diyAudio Member Join Date: Jul 2010	Problem with Champ build I'm building a Fender champ style amp. Using a 6l6 instead of 6v6. The problem is the power I'm getting out. About .5 watts. I've checked the voltages on the 6l6 its 360v on the plate 345v on g2 the tube is drawing current around 50ma everything seems normal but no power or very litle I even tried a diferent OT same thing. I'm sure the problem is simple but i dont know were else to look. This is not my first champ build my other one puts out over 5w. I need some help please! Thanx Mario.

9th July 2011, 04:14 AM	#4
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Does it go from clean to dirty when you increase volume? Do you get low power on dirty sound? __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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9th July 2011, 01:36 AM	#2
jjman diyAudio Member Join Date: Jan 2009	Schematic? Scope? Wrong NFB resistor? What is the cathode voltage and resistor on the 6L6? What is the p-p voltage on the grid of the 6L6 before clipping/clamping is observed?

9th July 2011, 03:59 AM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Perhaps one of the earlier stages is goofy,and isn't sending enough signal to the grid of the 6L6? Just a random thought.

9th July 2011, 07:44 PM	#5
mario13 diyAudio Member Join Date: Jul 2010	Thanx for the input guys! I found the problem was in my power supply, a choke with a high dc resistance that I shouldn't have used. Basicly it murdered my HT voltage. A silly mistake! Oh well a learning experience for sure! Thanx again! Mario.