What effect will swapping the 12AX7s have on my Peavey Delta Blue?

[dnauhei]

I already replaced the EL84s with a matched set of Mullards in my Peavey DElta Blues. The 12AX7s are the original Sovteks, which the reviewers have said are no good. But given that I have done the EL84s, what can I expect from doing the 12AX7s?

While I'm at it, what should I swap the Blue Marvel with?


FYI: It is a 112 and I bought it nonfunctional, so I don't know how it sounded before the Mullards.

Thanks for the input!

[Darth Tater]

The Delta Blues is a 1x15 (or a 2x10), you sure you have a 12 in there?

[tom8463]

I have a classic 30, which I believe is the same amp section as your Delta Blues. I swapped out all of the original Sovtek tubes for JJ's and did not notice any real difference.

I believe that your comment of it being a 112 is incorrect. As far as I know, the Delta Blues comes with either 1-15" speaker or 2-10's. I'm not an expert, but I think this is true.

[dnauhei]

Yes, it is a 115. Brain fart. They happen more often every day.

[Ramblin390]

trust me, tung sol in v1- penta lab chinese in v2-sovtek lps in v3-or go ask over at the pv forums

no jj's in the preamp!!!!!!!!!!!!!!!

[Darth Tater]

I tried various speakers in my Delta Blues and always went back to the stock speaker which is actually an Eminence Legend. I concluded that the only real reason to change the speaker would be to install something like a Jensen Neo which would significantly reduce the weight. But as far as sound, I liked the stock speaker best.

[cap47]

trust me, tung sol in v1- penta lab chinese in v2-sovtek lps in v3-or go ask over at the pv forums

no jj's in the preamp!!!!!!!!!!!!!!!
This is a prefered preamp line up by many on the Peavey forum! They must know something! The Penta is a 12ax7 9th Gen!

[dnauhei]

Anybody know if that tube swap would require rebiasing?

[oldhousescott]

Rebiasing is only for output tubes (and then only on amps with adjustable fixed-bias circuits). It's fine to just swap the preamp tubes.

[teleman1]

Get one Mulllard or Bugle boy in the 12ax7 v1 spot. That will answer your question.

[el34power]

Mine came with JJ's threwout. Letf the Blue marvels in there (2x10) this thing kills. I am not changing anything in there.. And God knows i have spent thousands in tube and speaker swaps before, in other amps