Mark IV

[Axe Wielder]

Okay, so I got my Mark IV back yesterday. $118 and Im not even sure what they did to it. I know they cleaned/fixed some of the pots, cause the knobs (most) work now. The guy working didnt seem to know much about what was going on.

I had 2 6L6's and 2 EL34's in it when I dropped it off. The EL34's were in the 2 outer sockets and 6L6's in the middle to sockets.

well, I get it back and it has the same tubes in it, only they are switched so its like (from left to right) EL34, 6L6, EL34, 6L6.

is this okay? I thought that they had to be matched in the outer and center sockets?

Im guessing the tech knows what he's doing, but ....what the hey?

any help?

 

[turnitdown]

$118 and Im not even sure what they did to it.

As I said in the other forums you posted this question to, why don't you ask the tech? How does it sound? Whay are you posting the same question in all the forums? Why is this question in the "The Rack" forum?? God, I have a lot of questions...

 

[Rodger Hartlett]

well, I get it back and it has the same tubes in it, only they are switched so its like (from left to right) EL34, 6L6, EL34, 6L6.

is this okay? I thought that they had to be matched in the outer and center sockets?

Im guessing the tech knows what he's doing, but ....what the hey?

any help?

yes that's okay because each half is balanced. it's leftmost two then rightmost two that push and pull the wave in the output stage.

what isn't good is the useage of two different types of tubes i.e the 6l6 and el34 . they should be completely matched either all 6l6 or all el34s because each type draws a different amount of current for bias as well as having completely different reactance curves.

you might be better off running just two el34 tubes in the outer two sockets.it would be less prone to failing.

 

[Axe Wielder]

yes that's okay because each half is balanced. it's leftmost two then rightmost two that push and pull the wave in the output stage.

what isn't good is the useage of two different types of tubes i.e the 6l6 and el34 . they should be completely matched either all 6l6 or all el34s because each type draws a different amount of current for bias as well as having completely different reactance curves.

you might be better off running just two el34 tubes in the outer two sockets.it would be less prone to failing.

yeah, supposedly you can run the EL34's in the outter 2 sockets, but with 6L6's in the inner 2.

and sorry for posting the same qeustion twice, I wasnt really sure where to post this question.

I have a set of 6L6's that I can run instead of the EL34's, but one of them is going bad.....I think I'll just run the El's in the outter sockets and 6l6's int he inner two until I can afford a total re-tubing.