Wurlitzer 120 / 700 Amplifier Rebuild Components
This kit contains hand-selected replacements for components that commonly fail in Wurlitzer 120 and 700 tube amps. Installing the parts in this kit can help you achieve a more reliable, cleaner-sounding Wurlitzer.
The 120/700 kit includes:
All filter capacitors
The cathode bypass capacitor for V1 as well as the shared bypass capacitor for V2 & V3
Bright capacitor
All coupling capacitors
All resistors
What makes our kits the best is that extra attention is taken to ensure the components are the correct ratings and values (or better) and the appropriate sizes. This ensures your amp is up to the highest standards. We wouldn’t sell a kit that we wouldn’t put in an amp ourselves!
A three prong power socket is not included in this kit, but can be found here. A grounded power socket is a great upgrade that will help reduce hum and noise as well as make your amp more safe.
For repair suggestions, check out our guide to choosing which components to replace. Or, contact us for help deciding.
This kit contains hand-selected replacements for components that commonly fail in Wurlitzer 120 and 700 tube amps. Installing the parts in this kit can help you achieve a more reliable, cleaner-sounding Wurlitzer.
The 120/700 kit includes:
All filter capacitors
The cathode bypass capacitor for V1 as well as the shared bypass capacitor for V2 & V3
Bright capacitor
All coupling capacitors
All resistors
What makes our kits the best is that extra attention is taken to ensure the components are the correct ratings and values (or better) and the appropriate sizes. This ensures your amp is up to the highest standards. We wouldn’t sell a kit that we wouldn’t put in an amp ourselves!
A three prong power socket is not included in this kit, but can be found here. A grounded power socket is a great upgrade that will help reduce hum and noise as well as make your amp more safe.
For repair suggestions, check out our guide to choosing which components to replace. Or, contact us for help deciding.
Over time, components in vintage amps will degrade, resulting in noise and poor performance. This kit contains hand-selected replacements for components that commonly fail in Wurlitzer 120 and 700 amplifiers. Installing the parts in this kit can help you achieve a more reliable, cleaner-sounding Wurlitzer.
Choosing which components to replace and which components to keep depends on a number of factors, including the condition of the amplifier as well as the personal preference of its user. For this reason, we offer several kit options that will allow you to replace as many or as few components as your specific amp requires.
Features of this kit include:
High-quality components hand-picked for suitability in a point-to-point circuit
Components individually bagged and labeled
Can be installed in all Wurlitzer 120 and Wurlitzer 700 amplifiers
Warning: The Wurlitzer 120/700 amplifier contains high voltages that can persist even when the amplifier is turned off and unplugged. Safe and effective installation of the components in this kit requires some electronics experience. Incorrect installation of these components can result in damage to your amplifier or injury to yourself. If you are unsure how to install these components yourself, you can mail in your amp or drop it off at our Tuckahoe, NY location and we will install the components for you.
About the 120 Kit
The kit includes all of the electrolytic capacitors, all power resistors, and a selection of preamp components. This kit will improve the reliability and performance of your Wurlitzer with a minimum of replacement components. It includes:
All filter capacitors
The cathode bypass capacitor for V1 as well as the shared bypass capacitor for V2 & V3
Bright capacitor
All coupling capacitors
All resistors
Why replace these components?
Electrolytic capacitors deteriorate over time, which can cause hum, poor frequency response, or otherwise reduced performance. Note that although new electrolytics can improve the noise floor of your amplifier, they are not a magic bullet. There are many factors that can introduce hum into a vintage circuit. However, even if the electrolytics are not the primary cause of your Wurlitzer’s hum, it is always worthwhile to replace them for the overall health and longevity of your amplifier.
Power supply resistors perform under conditions of high heat and stress that, over time, can cause their values to drift. Deteriorated resistors can also introduce noise into circuits. We recommend replacing power supply resistors at the same time as the electrolytic capacitors.
The coupling capacitor and input resistors are intended for your amplifier’s input circuit. Although components at an amplifier’s input are no more likely to deteriorate than components elsewhere in the circuit, the input is very sensitive. Noise and poor frequency characteristics at the input will be amplified by the rest of the circuit. For that reason, we prefer to replace input components in many amplifiers that we repair. We have included them in the Basic kit so that you will have that option as well.
The 120 / 700 Kit Is Now Even More Comprehensive
The 120 is a classic and straight forward tube amp design. Since a weak or failing component can be anywhere in an amp like this, our kit is comprehensive and gives you all the components you need for the greatest chance at success in your repair. Though we suggest using all of the components in our kit for your repair, you may wish to check out our guide: What components should I replace in my vintage amp, and why? The below items are no longer optional, and are included in our standard kit.
Coupling capacitors. These polypropylene capacitors are low-noise and excellent for audio applications. Replace the coupling capacitors if they are shorted or otherwise nonfunctional, or if you feel that your Wurlitzer’s frequency response could be improved.
Bright capacitor. Early 120 schematics show a bright capacitor placed across the volume pot. This capacitor allows high frequencies to bypass the potentiometer, resulting in a brighter tone at low volumes. The bright cap was removed in later versions of the circuit. If you think that was a mistake, our bright cap option allows you to put one back in. Note that the original schematic shows a capacitor value of 500 pf.
Resistors. The small-wattage resistors in this kit are high-quality, low-noise metal film resistors. If your Wurlitzer happens to have one or more noisy or damaged preamp resistors, this kit will have you covered.