Does anyone know what modifications I need to perform on my Peavey Windsor 100 watt amplifier to make it operate on 6550/kt88 power tubes. I am using the amp as a bass amp and need more headroom to power my Ampeg 2X15 cabinet .

I understand that the Windsor was designed to be a high gain amp, but I have already performed a clean mod and changed the tone stack to get the amp voiced the way I like it as per these threads(http://www.thefret.net/showthread.ph...Peavey-Windsor , http://www.talkbass.com/forum/f15/pe...s-bass-522387/ ). Please note that I did not do the power section mod that Bill did on his amp.

After the preamp mods I can get some great clean tones up to around 2 o’clock the pre amp. Now I need more from the power section to combat the power tube distortion that I get when I turn my master volume up. It gets dirty around 1 o’clock… Is the 6550 mod as easy as changing the tubes and adjusting the bias pot or do I need to change some capacitor/resistor values to make it work? If so, which caps/resistors and what will values be? Will I need to change my power transformer?
Here is a link to the schematic:
https://rs312l3.rapidshare.com/#!dow...r.pdf|3257|R~0