JJ 5751 Preamp Vacuum Tube

This is exactly the tube I needed in my Laney IH15R head. It was "okay" with the 12AX7 in V1 position, but never could get cleans, and it had a bit of harshness. Switched this JJ-5751 in its place, and now it's like having a new amp. Cleans are much more clean, real cleans. When I turn on my Fryette SAS pedal in front for some dirt, it sounds better, and when I turn on my fuzz, it sounds better. I wish I had done this sooner!
As for The Tube Store...excellent! Quick shipment from Canada to Thailand, no hassles, no problems. Packed well, arrived safely. I'll do more business with The Tube Store.
Thanks!

I've never tried a 5751, so I purchased one of JJ-5751 tubes to see what sound I could get, and how it would effect my amp. After breaking it in for several hours I put a Blackburn Mullard in and played for around a hour, then replaced that with the JJ and out of all the 12ax7s that I own this tube brought out the ultimate sound for my ears! Everything was perfectly EQed with a presence of rich harmonics without a loss of bass, mids, and just the way the highs came through I found this very puzzling, and had me in disbelief in comparison with RCA, GE, Nos Mullards and other modern 12AX7s!!!! In V1 I have found the best tube currently available for my amplifiers, now I can sit on my treasure of NOS tubes and play this 5751 that should last a while with it's robust build. If you purchase this tube request balanced, and matched at 100/100 as I do with all my tubes, you wont find a better tube being currently made at a incredible price! Rock and Roll, Eddy!

This JJ-5751 tube is a must have in P1 for me. Along with that 30% drop in gain, the frequencies that this tube brings out are simply delightful. For me it's a must have in V1 for taming shrillness and boominess and to give me more clean headroom.
If you're on the fence or feel that your tone could be smoothed out a little, pick up one of these tubes and give it a try before ditching your amp. It's worth trying.

After the initial honeymoon, I came to the realization the Ultra-Gain channel on the DSL1H is just that. 0-to-UltraGain, nothing in between. Fine if that's your thing, but I was left wanting for more crunch.
And then I swapped V1 for this guy, JJ-5751 vacuum tube. Cue-in the celestial light beaming down on the half stack. Now we're playing!
It's essentially transformed the dirt channel. More options, more harmonics, musicality -favorite cliché here-. I can now dial almost any filth from light OD, to crunch, to grind, to full-bore. Still more gain than I usually need, past 3 O'clock, but I'm glad that option is still there.
I did lose a smidge of power in the operation, but this is my desktop/home/bedroom-studio amp, and it's way too forking loud for quiet practice as it is. So, in my opinion, for the purpose of the amp, this is no loss.
Seriously, if you have a DSL1 and read this: do it. Go. You'll be buying yourself a brand new amp, AC/DC in a mini-head for 20$ CAD. Go. Add-it to your cart...

I love this JJ-5751 tube. I use two of them in my Fender Blues Deluxe RI, in V2 and V3 (gain matched for V3). (I love the EH 12AY7 for V1)
Compared to 'normal' 12AX7s they have about 30% less gain, which translates to more headroom. I find them very dynamic/responsive to picking.
I love the EQ of this specific tube. It has full, rich mids, sparkly treble, and a good amount of bass but not flubby. Really keeps all of your guitar there and gives you a soundspace to work with.
I would totally try these in an audio amplifier as well but I am not experienced in that realm.

Highly recommended by me. If your tube amp is a bit too loud or getting fizzy with the gain up, try these.