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how much will it effect the performance of my amp though, because if it isnt to drastic of a change, i am not going to worry about it, because i am still young and i am not using the amp for any serious gigs or recording sessions. however, i do want it to sound really good, i am kinda a tone...

would you recomend returning my power tubes also to get ones that will match my amps biasing, i dont know how much it changes the tone, and i am just wonding if it would be worth the weight and 15% restocking fee. Also, i need to know which tube rating number i would need. Right now i have...

i meant V4 in the preamp, and i have a Mark IV a, it was the tube farthest to the left if your facing the backside. right now all the noises are gone and it is completely silent. Thanks so much, ill post in a day or two if it is still silent. O, and one quick question, is there any way to...

ok, i replaced the fourth slot with a better tube, and most of the squealing is gone, but there is still a slight fuzz crackly sound that constantly comes out of the amp. It is a LOT quiter, but it is still there. any ideas? by the way, i have been laying on its side and i just removed the...

o wow, my V4 tube is glowing bright blue, and all my other ones are orange, is that probably the faulty tube?

Thanks strokes. I have the combo, but any tips on how to get the V1 tube out easier, since it is in the shield thing i have trouble lining up the pins with the holes

Wouldnt that blow my fuse?, also, how do i get it out without burning myself from the hot tubes if it is still on?

I got Matched Quads for Power tubes, and i got them from The Tube store online. i even got a matched sides preamp for the first stage. The Amp still works, its just that when i don't play it whines like a siren and crackles and stuff. Is there a way to check the tubes without taking them in...

I got my Mark IV on eBay about 8 months ago, and just changed the tubes for the first time a week or two ago. I have noticed that when i turn on my amp there is a crackling noise then it turns into a siren like noise, almost like an ambulance or something. I don't know what is causing this...