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Ships to:
United States
Ships to:
United States

Details about  Genz-Benz GBE-250C 250w, 1x15” Bass Combo; Casters, Blendable Tube Sound

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Genz-Benz GBE-250C 250w, 1x15” Bass Combo; Casters, Blendable Tube Sound
Item Ended
Item condition:
Oct 30, 2011 19:29:19 PDT
US $299.99
$44.89 Standard Shipping | See details
Item location:
Hanson, MA, United States


eBay item number:
Seller assumes all responsibility for this listing.

Item specifics

Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully ... Read moreabout the condition

Genz Benz

Impedance (ohms):

8 Ohms

Amplifier Type:




BBQ Bob's Crossroads of Music

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With experience designing and manufacturing both bass guitar speaker cabinets and amplifiers, it became obvious that there is a large market for a bass amplifier that reproduces the natural tones of the instrument itself. With many amplifier manufacturers hyping their “distinctive” sound, it seems forgotten that the player has chosen his instrument for it’s feel, playability and tone. Why then, should the amplifier manufacturer feel compelled to change this sound?

As with our speakers, Genz Benz amplifiers strive to maximize your instrument’s natural tone and feeling without imparting additional coloration. This resulting sound will not become obsolete with changing fads but will always be true to your instrument’s natural qualities.  The circuit design, features, physical construction and speaker selection have been carefully calculated to give you, the experienced player, the best performance and value in bass guitar amplification. Featuring sturdy jacks and controls, blendable Tube-Fet front end, a balanced direct output and an industrial duty bipolar power amplifier with toroidal power transformer, the Genz Benz 250/500 series bass amplifiers and combos will give you the tools necessary to sound your very best on stage.

The first stage of the GBE-250C preamp uses a low noise bi-fet linear scaling amplifier with a low cut point at 23 Hz to prevent excessive speaker cone excursion and intermodulation distortion. There is a smooth first order high pass boost network starting at approx. 2.5kHz with a passband gain limit of 6 dB. Additional bandwidth roll-off is provided at 20 kHz for RFI suppression. The variable gain stages are a feedback-divider type control, one of which is all solid state and the other utilizing a cathode follower (tube) each providing a maximum gain of about 30 dB. On the tube stage, variable non-linear loading creates a smooth and natural sounding overdrive rich in second harmonics. These blendable gain stages feed the 4 band active equalizer which is composed of 4 discrete bandpass filters combined in a current summing arrangement. These filters provide 9 dB of boost and cut, with center position flat. The output amplifier feeds the master volume control and fully protected power amplifier. A low noise differential output amplifier is provided for the direct output (switchable pre/post eq) and is phantom power protected.

The power section consists of a low distortion bipolar power amplifier with integrated limiter which allows gradual overload without sudden loss of feedback control of the speakers. In the GBC-250C, output is rated at 175 watts RMS at 8 ohms and 250 watts RMS at 4 ohms.  The amplifier topology is low feedback class A-B with servo control of bias and DC offset.  Also provided is on board output limiting, dual slope integrated VI limiting, solid state thermal protection, short circuit load protection, dc fault protection and RFI suppression. All amplifier status points are indicated on a dual color led array.. This amplifier uses heavy duty copper based polar power transistors directly mounted to a hefty extruded aluminum heatsink. The output section sports a combined rating of 1600 watts and 128 amps to insure a conservative and reliable design.  An important and not commonly discussed specification is the power amplifier’s ability to deliver rated power into a reactive load.

All speakers present a reactive load to the amplifier which reduces real world driving ability. The power sections of all model 250 and 500 amplifiers are rated to deliver full power into a reactive load with a 45 degree (leading or lagging) power factor phase angle. This is one reason Genz Benz amplifiers sound so big The following feature set is included on all 250/500 Bass Amplifiers. These features were included based on usability and are the result of the input of veteran players around the country.

Two inputs are provided, passive and active.  The passive input has a higher gain and input impedance which is tailored to the characteristics of passive pickups.  The active input has a lower gain and input impedance which is tailored to active pickups. An active pickup is, for all practical discussions, any pickup that uses preamplification between the pickup element and the amplifier input. The purpose of this preamplifier is to buffer the high impedance signal from the pickup element (magnetic, piezo-ceramic, piezo-film etc) and convert it to a higher level, lower impedance form. It is common for a bass with active pickups to have higher output level and longer sustain because only a small portion of the energy required to make the electrical signal comes from the vibrating string.  The harmonics and saturation controls, in conjunction with the tube gain control, allow additional control of preamp overdrive variables. The saturation control affects primarily the apex of the waveform, similar to the effect of overdriving and saturating the output or interstage transformer of a tube amplifier.  All this is driven through the 15” Genz Benz speaker and a horn.  A great sounding combo.

This Genz-Benz GBE-250C 250w, 1x15” Bass Combo is being sold used and comes to you in close to excellent condition.  Though generally very clean, there are some wear marks showing on the carpeted cover like the edge picture shown.  Nothing breaks the surface of the amp or goes through the carpeting, but there are some marks on the top and side of this amp.  There is visible rusting on some of the screws throughout the amp as well.  All electronics work as they should.  You will receive it well-packed but without the original paperwork or packaging. Returns are very limited (damaged or erroneous in its description).  Please ask all questions before bidding as your satisfaction is important to me before you purchase.  Customer 100% satisfaction is our one and only goal. Here on eBay, the only way to show that to our customers is via our feedback. If for some reason you are not 100% satisfied, please do not leave negative or neutral feedback. Give us a chance to fix or resolve any problem you may have with your transaction. We want to earn every single positive feedback because we don't plan to work with you only once, we want you to come back.  Conversely, the Seller reserves the right to refuse bids from folks with recent negative feedback or less than 5 transactions on eBay.  PayPal preferred and all payments need to clear before shipping. Insurance included with shipping. Buyer is responsible for any and all local taxes or custom duties with this purchase. Most importantly, thank you for looking!

On Sep-25-11 at 19:27:53 PDT, seller added the following information:

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