Hola! Perhaps you awesome peeps can resolve my query on bias..

korovamilkdud · 11-14-2009, 07:30 PM

I own a Splawn Quickrod. Voiced pretty well, but I'd like to try either KT66 or 6L6 tubes instead of EL34. I've been told I'll have to perform a bias mod in order to accomplish this change.

Now, I understand completely that Capacitors can store lethal voltages. Good thing I can drain them. So if I die attempting to follow your advice, you're off the hook now, and it is entirely my own fault when I find myself in a dark tunnel gazing at a bright light at the end of it.

I'm basically just trying to prepare for a mod if I can't set my bias low enough to accomodate a 6L6 pair.

Old Tele man · 11-15-2009, 08:24 PM

...CAUTION over ADVENTURE!

...have your local "qualified service technician" show you, that way you can WATCH how it's done correctly.

booj · 11-30-2009, 06:37 AM

The 6L6's or KT66's will require a higher negative voltage, which the bias supply may not be able to produce if the amp is set up strictly for EL34's. For example, you might need -55v instead of -42 volts

11-14-2009, 07:30 PM	#1
korovamilkdud Junior Member Join Date: Nov 2009 Posts: 1	Hola! Perhaps you awesome peeps can resolve my query on bias.. I own a Splawn Quickrod. Voiced pretty well, but I'd like to try either KT66 or 6L6 tubes instead of EL34. I've been told I'll have to perform a bias mod in order to accomplish this change. Now, I understand completely that Capacitors can store lethal voltages. Good thing I can drain them. So if I die attempting to follow your advice, you're off the hook now, and it is entirely my own fault when I find myself in a dark tunnel gazing at a bright light at the end of it. I'm basically just trying to prepare for a mod if I can't set my bias low enough to accomodate a 6L6 pair.

11-15-2009, 08:24 PM	#2
Old Tele man Senior Member Join Date: Oct 2007 Location: Tucson, AZ Posts: 431	...CAUTION over ADVENTURE! ...have your local "qualified service technician" show you, that way you can WATCH how it's done correctly. __________________ ...and the Devil said: "...yes, but it's a DRY* heat!"*

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11-30-2009, 06:37 AM	#3
booj Senior Member Join Date: Jun 2008 Posts: 347	The 6L6's or KT66's will require a higher negative voltage, which the bias supply may not be able to produce if the amp is set up strictly for EL34's. For example, you might need -55v instead of -42 volts

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