Discussion in 'Amps and Cabs' started by michael c, May 18, 2008.
I am going to use the 12AT7 in the reverb and also phase invertor slot.
you can still get mullard CV4024 fairly reasonable. i have several in my amps
The Mullard is nice as is the GE 6679/12AT7 and the Phillips JAN 12AT7
Mullard CV4024 or RCA 12AT7, hands down.
Of the new prod. ones I'd choose anything cryo-treated that is not EH (as these are quite spongy).
Do I need a matched pair if I am using one in the reverb slot and one in PI slot?
There is frequent mention of the Mullard CV4024 (12AT7WA) here, and I just want to point out that the later production version of this tube (from early-'80s) sounds different than any other 12AT7 I've tried. They've got a thicker tonal character, with more low-frequency content than your typical 12AT7.
This is a good thing, in my opinion. But if you're choosing for an amp that is already a bit dark sounding to you, you might go with the RCA that Blue Strat recommends, instead.
Mullard also made the CV4024 in earlier years ('60s) which behaves more like other 12AT7, i.e. much more tonally thin and bright.
the mullard cv4024 definitely sounds stronger than most 12at7's i've tried. they seem to be somewhere in between an at7 and ax7 in terms of gain. rca 12at7's almost always sound right in the p.i. to my ears.
I'm thinking of getting these tubes for a Mesa Maverick that I rarely use. (I have other vintage Marshall/Fender/Gibson amps that see more use.) Everytime I play the Mav though it surprises me how good it sounds! I've never thought about messing with the tubes on the Maverick but thought I would check it out. The 'lead' channel on the Mesa is a bit dark so should I go for the RCA? This amp has a wonderful clean channel and the lead channel is very creamy. If I use the SS rectifier instead of the tube rectifier it gets less spongey and dark but still very thick.
Any other suggestions/thought on this? How much thicker do the Mullards sound versus the RCA tubes? Is it subtle or a real noticeable difference.
I like the RCA at7 a lot, but I LOVE the Mullard 4024. Both offered a sonic improvement over the chinese new-stock ones I had, but the Mullard is just a bit sweeter on top; less presence = smootehr overall. And still priced reasonably compared to Mullard ax7s. Get em while you can.
I'm not sure how to quantify the additional tonal "thickness." Ummm... lots! Depends on how sensitive you are to tonal changes, but it is quite noticeable, in my experience.
RCA grey or black plate? Bob
Black plate for me, please. Once you go black, you never go back!
mmmmmmmm black plates...... ~~~~~ (Drool)