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| | |-+  Ceriatone 2204 Tube chance EL34 to 6550		 « previous next »
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Author Topic: Ceriatone 2204 Tube chance EL34 to 6550  (Read 5035 times)
Jimmy
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« on: June 12, 2009, 06:27:56 AM »
Hello!
Does anyone have chanced his Powertubes from EL34 to 6550 Tubes? What resistors do i have to chance? Does anyone have a Layout to show me?
Thanks
Jimmy
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lespaulplayer
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« Reply #1 on: June 12, 2009, 04:21:23 PM »
This is on Voodoo amp's site;

MARSHALL EL34 to 6550
1.) Change the bias resistor to 47K (located above the bias pot).
2.) Set the bias pot to max (around –38 volts)
3.) Locate the purple feedback wire (that is connected to the 8-ohm speaker tap) and solder it onto the 4-ohm speaker tap.
4.) Install the 6550’s and re-bias the amp.

http://www.voodooamps.com/home/TubeConversions/tabid/118/Default.aspx
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