The HushPuppy is a plug-in module that replaces your output tubes and reduces the power substantially, allowing you to overdrive the output stage at a much lower room volume.
No modifications are needed to your amplifier, other than removing one or more output tubes and replacing with the HushPuppy. It does not matter if your amp is Single-ended (Fender Champ, for example),
Class-A (Vox AC-30 and many others), or Fixed-bias [which includes adjustable bias]. The HushPuppy
creates its own environment within itself. But don't mix Class-A original tubes and the HushPuppy. The Vox AC-30 has
its tube cathodes in parallel, and if you pull one tube, the rest draw more current to make up for it. Always check
before purchasing if you are unsure of how your amp is biased. Eventually I will provide a table for this.
As an output tube, the HushPuppy can use quite a few standard preamp tubes that you probably already have: 12AX7, ECC83, ECC803, 7025, 5751, 12AT7, 12AU7, 12AV7 ...and more variations of pin-compatible tubes. There is a long list.
So, how does it sound? Expect a change in tone, but not a bad change. It is more capable of high and mid-range sound than huge chunky lows, since the surface area for carrying current is so much lower, but that is not always a bad thing.
The first one I installed on a Hot Rod DeVille had the owner saying, "Finally, I can play my guitar at home!"
I have built several amps with the HushPuppy technology built in, and they all sounded good.
Noisy EF86 replacement!
The well-known EF86 tube is notoriously microphonic.
If you have a Vox or another amp that uses the EF86 tube for vintage sound, take a look at this.
Its hard to find a current production or even an Old Stock tube that is not microphonic. I have a solution
for that. My new EF86 Tube Converter will plug into the EF86 socket and allow a quieter 6AU6 tube to be used.
I plan on selling them with the replacement tube included and installed in the module. In preliminary sound checks, it sounds the
same as the EF86, but with no microphonics. The first units are now available. Call for pricing.
If you are thinking of a new amp, look at my
page to get an idea of what a custom amp from me could cost. New formula on 4/15/2015! (Closer to reality, I think.)
The Mosfet Booster from Fratus-Amplification.com
If what you need is more gain, but you are happy with your tone, then this is
Made in the USA!
$165 - Sold directly from this website!
This pedal is really different. I scoured the world through the
internet, and found that almost all the "mosfet boost" and "clean boost" pedals
have in the reviews and fine print phrases like, "overdrives nicely when you turn
it up", "adds shimmer and sparkle", "enhances", "fattens up your tone", and so on.
If that is what you are looking for, then this is not your kind of pedal.
This pedal is a studio-quality preamp, designed like a tube preamp stage.
Consequently, it does not favor one frequency over another, and it does not change
This is a new design, designed after a lot of study and contemplation. It
has its roots in classic tube preamp designs.
Specifications: Gain: Adjustable Amplification levels of zero (no signal output)
to nearly +20dB. Noise: TBD, but imperceptible. Distortion TBD exactly, but very low. Power: 9 volt standard battery or DC Power Jack 2.1mm, Center
Negative (Stomp Box Standard). Power draw: 4mA Maximum, Operating or Quiescent. Input: High impedance, at least 330K Ohms via 1/4 inch Mono
Jack. Input Level: 4 Volts P-P Maximum. Output: Adjustable level, with a low impedance of about 10K. 1/4
inch Mono Jack. Output Level: 4 Volts P-P Maximum. Power Switching: Power comes on when you insert a Mono 1/4 inch
plug into the input jack. Indicators: The LED on unit shows when the effect is switched into
the signal path. Signal switching: True Bypass Push-On/Push-Off via
Now you can have the tube sound but without the tube problems!
You will not believe how good these sound... In normal amp preamp positions, they sound every bit as good as the best NOS tubes!
This module is designed for use in the normal Class-A stages of most first tube preamp stages. If there is any doubt as to whether they will work in your application,
please call with your amp's make and model number and I will look it up.
This will not work for the Phase Inverter or Cathode Follower in most amps, as it requires more current capability. I have another Synthetic Tube Module for that usage in the testing stage. It will be released for production soon.
New Models Available!
Normal Gain $45.00 USD
Treble-Boost Normal Gain $50.00 USD
Bass Normal Gain $58.00 USD
High-Gain $55.00 USD
Treble-Boost High-Gain $60.00 USD
Bass High-Gain $68.00 USD
You can buy them online right here. Just chose which model(s) you want:
- This amp is an all-tube, one-input design, with two internal channels. The
Normal channel is used all the time and can be run clean or dirty,
depending on your settings. The Overdrive channel is mixed with
the Normal channel via the Mix control, into the Master Volume
- This amplifier design uses two separate output devices: 6L6's or my "Hush Puppy"
outputs, so that the output power is selectable as either 45 Watts or 4 Watts. It
can be switched on the fly, during play in fact.
- The Effects Loop Output is buffered and the level is adjustable. The Effects Loop
Input goes right to the Master Volume Control input.
- The power supply is selectable for either a solid state diode or a tube
rectifier. The Diode give more power, but the Tube gives more personality, and the
amp responds more to your playing.
- There is a Feedback control that controls negative feedback. Turn it down, and
the amp can get real dirty. Turn it up, and the amp becomes very clean.
- The Ultralinear switch cuts in the Ultralinear windings on the output
transformer, creating even more linearity.
- Bias for the 6L6's is switchable to self-bias (Class A-like), or adjustable bias.
Bias is adjustable from the front panel, and is limited to extremes of Cold and
Hot. The Hot setting would break up sooner.
- The Harmonic switch purposely unbalances the Phase Inverter to create
- The cabinet is built from Bubinga, an exotic red wood from Western
Africa and Cameroon. Sometimes called "African Rosewood," it is not related to
rosewood at all. But it is incredibly beautiful.
The Mr. J. Guitar Amplifier
The goal with this design was a Hendrix-like sound with plenty of gain and
overdrive distortion. Power is from two 6V6's, with switchable Hush Puppies to
reduce power. A spring reverb added a nice dimension, and external effects loop
makes it expandable.
Mr. J. is now up North somewhere.
See how much an amp might cost with Amp Cost Estimator.
Pick the features you want on my Custom Amp Worksheet. Get an immediate response
with a detailed price breakdown.
I can then send you a detailed description and an invoice for a down payment to
start work on your amp.
Or, of course, call Mike at
This was an experiment that I might sell as a product - an amp built with terminal strips and screw-terminal sockets.
It can be assembled with nothing but a screwdriver! It would make a good kit to go along with a tube amp course.
Here is a clip of Les Connally noodling around with an even
more recent amp, a 50 Watt 6L6 Clean amp, designed like the 50W rack-mount amp.
(Any clipping is from my recorder, not the amp itself.)
, or listen to the MP3 Clip Here!.
Newest Distortion Box
Here is Michael Anthony Shanks playing through the latest version of a new
Distortion/Fuzz Box. Played on one of my own amps, a
6V6 Push-Pull 24 Watt type, through a Jensen 10' speaker. Captured with a Tascam
DR-05 24-bit recorder.
, or listen to the MP3 Clip Here!.
This is the most-recent pre-production model. I think this is going to be the final design.
It has a 3-position distortion level control, a tone control, and an output level control.
Plus, True Bypass and operation on battery or standard stompbox power supply.
A Custom Stompbox
This particular custom stompbox is a combination of Treble boost/cut
with Bass boost/cut. Nice range of control. Overall Gain Knob. True bypass. Sounds
Entire site Copyrighted by Mike Fratus, webmaster at Fratus-Amplification.com 9/7/2016 - don't
snag! Leave email with suggestions or requests at: