Harley Benton Custom Line Thunder 99
Guitar Power Amplifier in Pedal Format

Latest User Reviews
Great little unit but problems with the headphone output
I bought this pedal/power amp to boost my overall guitar volume and run 2 speaker cabinets at the same time (2x50W out is LOUD!). I play in a hardcore punk band with minimal effects. I have 2 stacked distortion pedals running into an Orange Terror Stamp which is being used as a preamp. I then connect the line out of the Orange to the input on the Thunder 99. It does not color the tone at all and just provides more volume to the speakers. This is exactly what I was looking for. 1 issue: - The headphone jack has a problem where audio is clipping no matter what I use for headphones or inputs to the pedal. Since my Orange Terror Stamp has a headphone out this isn't super important to me but it would have been nice to have the unit fully functional out of the box as it is not a used pedal and I did pay full price for it plus international shipping to the US.
Good Little Stereo Amp
Does What its Supposed To
Very surprised
It delivered a decent amount of power. It works out great for a small paddle board and is able to power to being used as FRFR
Doet wat ie moet
Gekocht om Boss GT core in stereo te kunnen gebruiken. Doet ie perfect!
Mini stereo amp
Lads, If you know what you need, a tiny stereo PA (my use) , or using with guitar, this device is a killer...
didn't work
arrived set it up as instructed had to find a new kettle lead to power it with the correct fuse and ratings as the adapter sent was incorrect ,returned for a refund . i was looking forward to using it but wouldn't power up .
Unbelievable Value in a small footprint
I have been looking for years for an easy solution to play in stereo without two amps and this has delivered. I know the Carvin Mach 100 is the same unit but this is still 2/3 of the prices with shipping to North America. I don't know why other amp and pedal manufacturers haven't jumped on this band wagon.
Works as it should and sounds great - not shocking at all
Bought this for use with a NU-X MG-30 mostly as I am trying to downsize the shear weight of my live rig. Have used it with a custom wired 4x12 and a home made 2x12 and so far it works exactly as it should. No issues with being shocked as mentioned in other reviews. I am in the USA and I had to supply my own plug for the power supply and I have no problems. This little thing works great it is plenty loud in the 2 configurations I mentioned that I am using it in and it doesn't seem to color the tone of my patches very much at all. I do wish it had some built in tonal adjustments on the pedal but not really necessary.
Both cabs I am using (though not at the same time) are wired for 4 ohms per side stereo and neither the Thunder nor the PSU gets hot at all.
So far so good - If the GPA 100 could use USA 120volts directly I'd buy one or two of those as well. This is the first Harley Benton gear I have purchased that wasn't a guitar. All 3 of my HB guitars are amazing so I took a chance on the Thunder 99 and I am glad I did.
Thanks.
Perfect solution for stereo portable setup
I use it for my Fractal FM3, its not the most powerful amp, after all its a pedal size amp BUT enough power to drive 2 2x12 cabs for practice or small rehearsals.
I even did a small club gig with it once, works excellent.
For what it costs + size + what it does, highly recommended
Easy way to get a stereo FRFR if you have PA or monitor speakers already!
I already own a pair of lightweight Fun Generation 12" PA speakers. Adding this and a couple 6.5mm to Speakon cables to my pedalboard gives me a very lightweight full stereo FRFR setup that is as easy on the back as it is on the wallet. Win-win in my opinion!
Technical Data
- Manufactured by Harley Benton
- Released in 2019
- Average price : $107
- Compact power amp pedal for electric guitar
- For direct connection to any preamp, pedal or effects unit
- Power: 2 x 50W to 4 ohms
- For 4 - 16 ohm speakers
- Master volume controller
- 2 Inputs (L / R): 2x 6.35 mm jack
- Aux input: 3.5 mm stereo jack with LED
- 2 Speaker outputs (L / R): 6.35 mm jack
- Headphone output: 3.5 mm mini jack
- Dimensions: 124 x 74 x 59 mm
- Includes 24 V / 4.5 A power supply
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