Discharging caps / Bleeding resistors for Champion 600

petlus · January 28th, 2009, 12:22 PM

Hi,
one question concerning: Discharging high-voltage caps on Fender champion 600...

Placing bleeding resistors (220k/2Watt) across each cap C5,C6,C7 - would this be 1.) possible and 2.) usefull as well instead of discharging high-voltage caps every time with a special tool (before working on the electronics)?

petlus · January 28th, 2009, 12:49 PM

I just thought about my post... one resistor (330k/2Watts) should be enough connected across B+ and ground... do I go wrong with that idea?

Jelle · January 28th, 2009, 01:16 PM

Every time I work on it I just strum chords while I switch the power off (no stand by); drains enough power to avoid being zapped. On bigger amps I do discharge them properly.

Scott S · January 28th, 2009, 01:22 PM

The idea in your first post is way overkill. (Not that overkill is a bad thing.

) A metal-film 500K across any one of the capacitors should be plenty, and it doesn't have to be a high wattage, 1/2 watt should be fine. On an amp with carbon-comp PS dropping resistors, it might be a good idea to use more than one bleeder, just on the off chance that one of the dropping resistors opens up. But even then, you'd probably have bigger problems to deal with if that happened!

Remember that the hot tubes will do a lot to discharge the caps when the amp is turned off, too.

- Scott

Schwebel · January 28th, 2009, 05:40 PM

Quote:

Originally Posted by Jelle

Every time I work on it I just strum chords while I switch the power off (no stand by); drains enough power to avoid being zapped. On bigger amps I do discharge them properly.

Ditto, I've done this tons of times on mine.

January 28th, 2009, 12:22 PM	#1 (permalink)
petlus TDPRI Member Join Date: Jan 2009 Location: Germany Posts: 13	Discharging caps / Bleeding resistors for Champion 600 Hi, one question concerning: Discharging high-voltage caps on Fender champion 600... Placing bleeding resistors (220k/2Watt) across each cap C5,C6,C7 - would this be 1.) possible and 2.) usefull as well instead of discharging high-voltage caps every time with a special tool (before working on the electronics)?

January 28th, 2009, 12:49 PM	#2 (permalink)
petlus TDPRI Member Join Date: Jan 2009 Location: Germany Posts: 13	I just thought about my post... one resistor (330k/2Watts) should be enough connected across B+ and ground... do I go wrong with that idea?

January 28th, 2009, 01:16 PM	#3 (permalink)
Jelle Tele-Meister Join Date: Jul 2008 Location: Netherlands Posts: 179	Every time I work on it I just strum chords while I switch the power off (no stand by); drains enough power to avoid being zapped. On bigger amps I do discharge them properly.

January 28th, 2009, 01:22 PM	#4 (permalink)
Scott S Friend of Leo's Join Date: Dec 2005 Location: SW CR IA US NA PE Age: 29 Posts: 2,875	The idea in your first post is way overkill. (Not that overkill is a bad thing. ) A metal-film 500K across any one of the capacitors should be plenty, and it doesn't have to be a high wattage, 1/2 watt should be fine. On an amp with carbon-comp PS dropping resistors, it might be a good idea to use more than one bleeder, just on the off chance that one of the dropping resistors opens up. But even then, you'd probably have bigger problems to deal with if that happened! Remember that the hot tubes will do a lot to discharge the caps when the amp is turned off, too. - Scott

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