JJ6l6 to Svetlana 6550C

[kylendm]

Well I'm going to be buying a quad of these in 3-5 days. What differences would i hear by getting these?

 

[yngzaklynch]

I just ordered a quad of Svetlana 6550 for my RM100KH from Dougs Tubes. I'll let you know.

 

[kylendm]

Alright sounds good .

What precautions do i need to take while changing from 6l6 to 6550?

 

[tehuk]

Just adjust the bias accordingly.

 

[Julia]

Turn the bias pots anti-clockwise before you fire up the amp to bias for the first time.

 

[tung]

Turn the bias pots anti-clockwise before you fire up the amp to bias for the first time.

Good advice, dude :wink: Don't want to to fire that baby up at 500 mva. lol

 

[JKD]

You need to remove the tube retaining clips....don't forget to put the screws back in afterwards though as they provide strain relief.

 

[kylendm]

Just ordered them. Should be here in 4-5 days. I'm scared since the only tube i've ever used in these amps have been JJ6l6s. Both my RM50 and RM100 used them. Hopefully the tone will be nice and fat .

 

[yngzaklynch]

Ok now that I've had a few days with the 6550Cs... Huge difference for the better. These tubes make the overall tone much thicker fatter tone and there seems to be a good smoothness. I recommend these to anyone that plays heavier stuff. Svetelana 6550C FTW!!!!

 

[kylendm]

Sick! just what i was going for. Something a bit thicker and smoother.

 

[Julia]

I've had them in since 9/1. Check your bias every week for a bit. Bias these around 40 mV to start and see how they balance out.

The tone will be a little fatter than the 6L6s. The 6550Cs break up nicely even at moderate levels, and I have the late distortion variety. They will still cut through a mix very well. I don't find them harsh.

 

[yngzaklynch]

I actually think they're smooth. There is still a healthy growl to the amp but nothing harsh. Much better amp with these tubes.