Preamp Tonekit 12AX7 (4)


Availability: In stock

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Tone Kit with 4 12AX7's.

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Upgraded tone kit

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  • Upgraded tone kit


This is a the "4 12AX7" version of the Doug's Tubes preamp tube cocktail kit and we've received great feedback on it. We have upgraded all preamp tone kits with Mullard over the Tung-Sol. There has been a supply disruption for chinese tubes, the Shuguang factory closed a year ago with no ETA for going back online. Ruby branded chinese AC5's are unavailable except for what is left in the retail supply channel so we have sourced original 2014 Shuguang 12AX7B's which are identical to the Ruby AC5 and screen them ourselves. The tonekit allows hi-fi and guitarists alike to experiment and "tube-roll" preamp tubes in different slots of their amp. We are now using the factory direct Shuguang 12AX7B in place of the Ruby AC5HG(same tube), and upgraded V1 with the Mullard CV4004 and the PI with the Mullard reissue 12AX7. Currently we're recommending the following:  

V1 - Mullard CV4004

V2 - Shuguang 12AX7B

V3 - Shuguang 12AX7B

V4 - Mullard 12AX7

Customer Reviews

Peavey JSX retube Review by Kevin
JSX sounds better than it ever has and I've tried a bunch. Thx for the advice. You'll hear from me again
Kevin (Posted on 5/24/17)
My Engl Fireball 60 was great....until the preamp tone kit came along. Review by Sam S.
For about 5 years I've owned this Engl. It sounded fantastic when I got it used. Years gone by I never changed anything g on this amp. Started a band not too log ago and I noticed it did sound a bit dark to me. I called Doug up and told him about what I was looking for. I wanted to keep the aggressiveness of the Engl, but I wanted more clarity. The amp itself when I bought it used came with Mesa branded 12ax7s. Possibly why it sounded very thick, dark with a ton of gain. Doug recommended these to me. Got them in the mail today, swapped the old preamp tubes out and slapped thsee in and it was literally night and day! The amp sounds more aggressive, much more open with alot more clarity. It's exactly what I wanted and Doug delivered. The man knows his stuff. I seriously cannot stop playing. He's got a customer for life and I'll definitely be buying my power tubes from him very, very soon. Thank you Doug! \m/ (Posted on 3/14/17)
What a difference!! Review by Nathan
At the recommendation of Doug, I bought this kit along with a matched pair of Ruby EL34BSTR's for my new Marshall DSL40c. Wow, what a difference some tubes can make! The high end fizz is gone on the OD channel and the sharp brightness is gone. I can actually use my treble and gain knobs now! Amazing...what a great sounding amp...thank you Doug!! (Posted on 2/27/14)
Mesa Boogie F30 Review by Jon
Hi Doug,

Got the new tubes you recommended for my F30 and they work great!

Thanks for the advice and the great new tubes.

Jon (Posted on 4/1/13)
Peavey Ultra retube(with the RUBY 6L6GCMSTR's) Review by Jamey
So I finally got a chance to put in the new "tone kit" and power tubes today... and I must admit I was pretty skeptical that there would be a noticable difference. I am glad to say I was dead wrong! The clean channel is much more vibrant and lush with a really nice "fenderish" bite and lots of clean head room. The crunch channel sounds pretty much like it did before (which is a good thing because that was the best part of this amp), and now the "ultra" channel is MUCH more articulate... less muddy and just really freeeeeeking great. You da man. Please feel free to share my testimonial for all the other Peavey Ultra owners out there. You rock!!!!

Jamey D.
Black Market Lunchbox (Posted on 1/5/13)
A blanket has been lifted from my Vox AC15c1 Review by Tim
Doug suggested his 12AX7 tone kit along with a matching pair of Sovtek EL84M's and I couldn't be happier with the results. It really opened up the amp while maintaining that Vox high end chime. The natural overdrive from the amp is now warmer and creamier. Highly recommended. (Posted on 5/7/12)

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