ISP Technologies Theta Preamp Distortion Pedal with Decimator Noise Reduction

Electric Guitar Preamplifier Pedal, with 2 x Gain Stages, 2 x 3-band EQ, Over 160dB of Gain, and Decimator Noise Reduction
ISP Technologies Theta Preamp Distortion Pedal with Decimator Noise Reduction image 1
ISP Technologies Theta Preamp Distortion Pedal with Decimator Noise Reduction image 1
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ISP Technologies Theta Preamp Distortion Pedal with Decimator Noise Reduction
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Much More Than a High-gain Powerhouse

ISP Technologies created the Theta Preamp Pedal to bring you the aggressive gain and sustain from their acclaimed Theta amplifier, in a pedalboard-friendly design. We're talking outrageous gain - over 160dB of gain, when you use both the Pre-distort Preamplifier and High Gain Distortion sections together. Or just the Pre-distort Preamplifier stage's 3-band EQ for sweet tone shaping independent of the high-gain stage, for extra versatility. And with its +/-15-volt power supply, you've got an amazing amount of headroom for more dynamic tones with the ISP Technologies Theta Preamp Pedal.

ISP Technologies Theta Preamp Pedal at a Glance:
  • Over 160dB of gain for undeniably aggressive tone and sustain
  • Decimator G-string II circuit means ultra-quiet operation
  • More headroom means more punch, impact, and tonal tenacity
Over 160dB of gain for undeniably aggressive tone and sustain

It may seem like a bit much, but between the two gain stages on the Theta Preamp Pedal you've got over 160dB of gain on tap. You can use the Pre-distort Preamp stage either for clean tone-shaping (with the 3-band EQ) or as a rich-sounding overdrive. The High Gain Distortion stage gives you 3-band tonal control too, so it's easy to really dial-in your ideal tones on the Theta Preamp Pedal.

Decimator G-string II circuit means ultra-quiet operation

The award-winning Decimator G-string II noise-reduction circuit on the Theta Preamp Pedal is what keeps this high-gain monster from sounding like a continuous static discharge. In fact, the Decimator technology provides more than 80dB of noise reduction. And the big deal with this generation of the Decimator technology is the incredibly smooth release response, which means that you don't hear the noise reduction working at all - you just notice how quiet your rig is when you're not playing.

More headroom means more punch, impact, and tonal tenacity

The Theta Preamp Pedal packs an internal +/-15-volt power supply, which gives it three times the headroom of a typical 9-volt pedal. More headroom means more dynamics, and that means more punch, impact, and nuance in your tone. So even if you have the gain on the Theta Preamp Pedal cranked, you'll still have a powerful, aggressive tone with a ton of character.

ISP Technologies Theta Preamp Pedal Features:
  • High-gain preamplifier pedal for electric guitar with two gain stages
  • Pre-distort Preamp stage can be used for clean tone shaping, or as an overdrive
  • High Gain Distortion stage provides incredible distortion and sustain
  • Use both stages together for up to 160dB+ of gain
  • Independent 3-band EQs with sweepable mids for each gain stage
  • Decimator G-string II circuit gives you over 80dB of noise reduction for quiet high-gain operation
  • +/-15-volt power supply gives you incredible headroom for more dynamic, punchy tones
The Theta Preamp Pedal packs more gain than you'll find in any other preamp pedal!

Additional Media

Theta Preamp Distortion Pedal with Decimator Noise Reduction User Manual

Tech Specs

Pedal Type Preamp
Inputs 3 x 1/4"
Outputs 1 x 1/4"
Height 7"
Width 5"
Depth 1.9"
Weight 2.2 lbs.
Manufacturer Part Number Theta Pre Amp Pedal

Customer Reviews

Based on 5 reviews
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Pro Guitar tone and boost

Gain 1 is smooth at 30% then special at 65%. Gain 2 is thicker more deep, also staggeringly good at 30% and 65%, different but good. Very professional piece for lead guitar fanatics. I also used the Preamp/ clean channel as a boost for the Sans Amp PSA-1 distortion and it is the best, very full and balance, the best sound and tone I had been looking for in a long time. Face melter metal and Rock full balanced lead tone. Pedal has a mid scoop that nails it perfectly for snap crackle and pop. Make sure to get a good tube amp and good effects rack. You won't be sorry.

Perfect for 80s rock and metal

I bought this thing for days i give my seven stringed guitar and my modern metal style a break and play some good ol hair band style on my six string, and does it do 80s PERFECTLY. I was able to get awesone def leppard like rockman tones as well george lynch like tones....truthfully, it can do any style. And this handles solos better than any other pedal or many amps i tried. Hooked straight into my peavey 6505 mh power amp section via effects loop return through a 2x12 and it sounds amazing, even hooked it to my old junk crate practice amp and it really polished that turd. I was even impressed with the clean preamp channelnas it handled my high output sd nazgul pickup without any breakup (my tube amp clean channels cant handle high pups). My only minor gripe is that u can't change distortion and clean preamp channels fast as when u disengage either it goes in bypass, or it combines both channels when engaged(not sure why u would want to do that) so its a bit of a tap dance if u want to switch in between them

Hot Judas Priest Marshall Sound, from Defenders of The Faith!

If You're Familiar with Judas Priest' Legendary Metal Marshall Amp Tone from their "Defenders Of The Faith" album, "Some Heads are Gonna Roll", "The Sentinel", "Jawbreaker" "Love Bites", etc, for Me, with My Guitars, Humbucking Pickups, and Ears, I usually always end up adjusting the Theta Pedals Distortion and Active E.Q. into somehow Sounding almost Exactly Like, or Very Familiar to the Sound of a Hot Raging English Marshall, Heavy Metal Tube Amp Tone! Pretty Much Exactly Like the Hot Marshall EL34 Tube Heads Glenn Tipton and KK Downing had Used During Judas Priest' "Defenders Of The Faith" Recording Sessions.But that's just Me and my Ear and Gear, Your Experience may differ, Don't get me Wrong, this Thing Is Capable of Massive SLAYER "Seasons InThe Abyss/South Of Heaven" Type, Crazy Man Thrash Metal and Death Metal Tones as well as other Hot Marshall EL34 Tube, Lower Gain, ZZ TOP Billy Gibbons Type Marshall Sounds and Coolness as well!

Best Distortion Pedal Ever Made!!!

When I first heard ISP were going to make a pedal version of the great Theta I thought it was going to be some lame imitation of that tone. Much to my surprise the Theta pedal sounds EXACTLY like the head. If you played with different distortion pedals then you know how bad most of them out there sound. This is the best tone you could ever get in one little box! I have toured with it and played big venues all over the country with it and you can dial a perfect tone for any room within seconds. The clean channel is crystal and beautiful. Two gain stages that could also run in series. The sweetest mids and tones of bottom end. You can get all the gain you want but it sounds amazing even for low gain applications. Then you have the expensive Decimator G-string built into it! I can't believe someone gave this 3 stars just because of this pedal's price!! Where else can you get the best tone that you can base your whole rig around in a little box with the decimator built in for this price??? Doesn't get any better than this!
Music background: Pro touring signed guitar player

Theta Preamp

I recently switched from a Egnater Tweaker 40 watt head/4 12" cab to a Mesa Boogie combo (Express 5:10:25 watt) so I could shrink my gig gear down. The boogie doesn't have as much gain as the tweaker, but sounds great, and is more versatile with boost and EQ sfootswitches. I needed a pedal to give me a high gain sound. This Theta does it well. I don't like the clean pre-amp, as my Boogie is really stellar in that dept, so I only use the distortion modes. having to slightly different gains available and the noise reduction is great. The only reason I rate it a 3 instead of higher is it's price is high. If you want a nice quite method of getting high gain sounds out of a clean amp, this is a good way to go.
Music background: 30 yrs of experience. Classic Rock cover bands mostly.

Sweetwater Advice

ISP Theta Preamp

The preamp gain alone is crazily effective for coaxing organic, harmonic amp distortion. If you're looking to get more oomph, definition, and control out of the amp you have, the ISP Theta can provide a lot of very interesting alternatives and solutions....
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See also: EQ Pedals, ISP Technologies, ISP Technologies Compressors and EQ