Fender 400 PS 1970-1975 Manual

Fender 400 PS 1970-1975 Amplifier manual cover
Pages 8
Year 1975
Language(s)
English en

Fender 400 PS 1970-1975 Amplifier Specification

The Fender 400 PS amplifier, produced between 1970 and 1975, is a formidable piece of musical equipment known for its immense power and distinctive sound. This tube amplifier features a whopping 435 watts of output, a significant achievement for its time, making it ideal for large venues and outdoor performances. It employs a trio of channels, each with its own volume and tonal controls, allowing for versatile sound shaping tailored to various musical styles. The amplifier is powered by six 6550 power tubes, providing robust and reliable performance with a rich, warm tone characteristic of tube-driven amplifiers.

Each channel includes a two-band equalizer, enhancing its adaptability to different instruments and genres. The presence of a built-in reverb unit adds depth and ambiance to the sound, a sought-after feature for many musicians seeking to enhance their sonic palette. The 400 PS also incorporates a unique harmonic vibrato, offering further modulation options and creative expression.

Physically, the Fender 400 PS is substantial, reflecting its high power output and durable construction. The amplifier's design includes a robust chassis to accommodate its complex circuitry and substantial transformer, necessary for handling its high wattage. Despite its weight and size, the 400 PS remains a coveted piece among collectors and musicians alike, revered for its unparalleled power and distinctive tonal capabilities. Its legacy continues to be celebrated by enthusiasts who appreciate its contribution to the evolution of high-powered amplification in the music industry.

Fender 400 PS 1970-1975 Amplifier F.A.Q.

How can I reduce the hum noise in my Fender 400 PS amplifier?

Ensure that all the tubes are properly seated and not microphonic. Check for any grounding issues and consider replacing old capacitors which are often a cause of hum.

What is the best way to clean and maintain the exterior of my Fender 400 PS amplifier?

Use a soft, dry cloth to wipe down the exterior surfaces. For tougher spots, slightly dampen the cloth with water. Avoid using chemical cleaners that can damage the tolex covering.

How do I properly bias the tubes on my Fender 400 PS amplifier?

First, ensure the amplifier is unplugged. Locate the bias adjustment pot inside the chassis, and use a multimeter to measure the bias voltage across the test points. Adjust the pot to achieve the recommended bias voltage specified in the service manual.

What should I do if my Fender 400 PS amplifier is not turning on?

Check the power cord and plug for any damage. Ensure the power switch is functioning properly. Inspect the fuse and replace it if it's blown. If the issue persists, consult a professional technician.

How can I improve the sound clarity of my Fender 400 PS amplifier?

Experiment with the EQ settings to find the best tone for your setup. Ensure that your guitar cables are of good quality and replace any worn-out tubes, as they can affect sound clarity.

What are the recommended replacement tubes for the Fender 400 PS?

The Fender 400 PS typically uses 6550 power tubes and 12AX7 preamp tubes. Ensure any replacements are matched and tested for best performance.

How do I connect external speakers to my Fender 400 PS amplifier?

Connect external speakers using the speaker output jacks on the back panel. Ensure impedance matching between the amplifier and the speakers to prevent damage.

Can I use effects pedals with my Fender 400 PS amplifier?

Yes, effects pedals can be used with the Fender 400 PS amplifier. Connect them in-line between your guitar and the amplifier input to achieve desired effects.

What is the proper way to store my Fender 400 PS amplifier when not in use?

Store the amplifier in a cool, dry place away from direct sunlight and moisture. Cover it with a dust cover to protect against dust accumulation.

How can I troubleshoot crackling sounds coming from my Fender 400 PS amplifier?

Check all cable connections for tightness. Inspect the tubes for any signs of damage or wear. Clean the input jacks and tube sockets with contact cleaner to ensure good connections.