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For Sale: Supercharged, Movable, Tunable Tone Amplifier For All Banjos

Posted By: yellowdog | Rate Member
 Member 10+ Years  Returns allowed with money back refund

$25 USD

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Our New "Supercharged, Movable, Tunable Tone Amplifier For All Banjos" replaces all previous models of tone amps because of its superior volume and sound quality. The reason for this superior performance, which is easy to see from the drawing, is our new "Sound Surface Wave Tunable Supercharger" which has been added to the top of the cross on the Tone Amp.

Much like a car supercharger compresses air before it enters the car's engine, this new supercharger banjo tone amplifier greatly amplifies and "tunes" sound surface waves from the banjo's rim before they enter the body of the tone amp. One could say with justification that I should have called it a "turbocharger" because it also uses the banjo's output, the banjo's air pressure waves of audible sound in the sound chamber, to create sound surface waves when they impact the tape and braided cord and create sound surface wave inputs. Which is true. So it really is both a supercharger and turbocharger but I'll call it a supercharger for simplicity.

The "supercharger" (See drawing in the ad) consists of: (1) a 4-3/4-inch long piece of waxed, braided nylon cord, 2-1/4 inches of which is covered with 3M's Model 600 clear acrylic tape. (2) The tape, which sticks the cord to the wood rim and, more important, adds surface waves to the cord all along the tape's contact length with the surface wave-amplifying, waxed, braided cord. (The braided cord amplifies waves on its fibers because the fibers intersect at an angle causing their waves to intersect at an angle and be amplified by the physics principle of "constructive interference".); (3) a size #1 steel paper clip (the standard size) at the far tape-free end of the cord which provides 3 small amplifying steel loops to the surface waves on the cord, (small loops amplify), and also amplifies waves on the fibers of the cord by compressing the fibers causing the waves to intersect and amplify, (constructive interference, again), and adds brightness to the banjo's sound from the steel; and, (4) a staple at the tone amp end of the cord which compresses the fibers of the cord causing surface waves on the fibers to intersect and amplify and which also attaches the cord securely to the top of the cross on the tone amp.

The Tone Amp body, itself, is unchanged from earlier models.

One paper clip gives great volume with beautiful high quality sound with just the right amount of sustain for solos on my tenor banjo. A 2-inch long steel paper clip gave my banjo a very strong sound but with less sound quality and sustain, perhaps better for a 5-string banjo. More than one may or may not give a better sound but should be tried because trying is as easy as adding a paper clip to a cord.

Performance of a banjo containing this new Supercharged Tone Amp, like our previous Tone Amp, is improved by the addition of our Bass Amplifier and Enhancer, which must be purchased separately but is very reasonably priced and is also movable to other instruments.

The "Travel Caddy" which was previously included is not applicable to this tone amp and is not included.

You can download the drawing (jpeg file) and a detailed explanation of how it works (PDF file) from the "Ideas and Downloads" page of my website,

Frank Geiger (Yellowdog)


By Mail and International Mail In Business Letter Envelope/ $1.00 US, $2 To Europe

Payment Methods:

Check/Money Order, Paypal, Mastercard, Visa

Payment Option Notes:

Pay with credit card through Paypal ( with credit to Geiger Acoustic Devices (

Return Policy:

Returns accepted. Buyer must contact seller within 14 days to arrange return. Refund will be given as Money Back. Buyer pays return shipping.

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This ad will automatically expire 10/4/2018 1:01:44 PM unless updated before that date. To keep the system current, ads expire if not updated for more than 60 days.

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