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OK, yeah. It's not that there's anything wrong with the 6505, or that I'm not pleased with it. I just wanted to do a little experimenting (plus, I've had the amp for three years and I thought it might be time to replace the tubes). I also have a Mesa Stiletto Trident which squeals and shrieks...

Ok, I switched the Ruby 6L6GCM-STRs with the Groove Tube 6L6Rs. I played it last night (at high volume), and I really couldn't tell the difference. They seem to be operating just fine, but I heard no real difference. Still the same shrieking and squealing at high gain settings as before. :lol:

What do you mean by "conservative"?

Ok, the tubes in my 6505 are Ruby 6L6GCM-STR. The ones I want to put in are Groove Tubes 6L6R (aka 6L6B), and they are rated at 4 (normal distortion). Are they compatible? How will they differ (in sound) from the Ruby's? Any idea?

I don't think the bias is adjustable (fixed bias???). So I'm just gonna try 'em out. All that other stuff y'all are talkin' about is like Norwegian to me. And I certainly don't want to argue about what brand tubes are best (I've read the arguments here). I've got 6505, and I've got Groove Tubes...

I'm wondering if Groove Tubes 6L6R (aka 6L6B) will be a correct match for my 6505 combo. Help?

I'm really in need of $$$ right now, so I'm thinking of letting this go..... I know I'll regret it though.....