Affordable, Quality Audio Repairs & Restorations

Phone: 519-513-1084

Email: repairs@dnaelectronics.ca

Address: 15 Shaftsbury Dr. Kitchener, ON, Canada

Quality, Reliable Restorations by Experienced Father & Son Technicians. We Take Pride in our Workmanship.

Receivers | Power Amplifiers | Integrated Amplifiers | Preamplifiers | Tuners

D 'n A Topics & Resources

Restoration Information

General information about our restoration work, and pricing information for various models.

Audio Specifications Database

We are compiling a database of audio equipment specifications gleaned from our annual equipment directory magazines, owner's manuals, service manuals, etc.

Audio Picture Gallery

Pictures of some of the equipment we've worked on, with occasional commentary.

Our Testing Procedures

We test the audio components we restore to ensure they perform at least as well as expected. This is both an overview of our measuring procedures, and an attempt to make clear exactly what is being measured.

FAQ

Answers to some frequently asked questions.

Marantz 4300 Gallery

Pictures of the Marantz 4300 4-channel receiver. The receiver can be used in 2-channel mode, where it produces 100 Watts/channel. You can see all the specs here.

If you have a Marantz 4300 receiver in need of repair, call us at 519-513-1084 or email us: repairs@dnaelectronics.ca.

Note: Most of these pictures show the receiver before it was rebuilt.

Rebuilding a Marantz 4300 is a very time-consuming job, since a 4-channel receiver has many more components than a 2-channel receiver.

The phono-equalizer circuit board.

The narrow board in the middle of the picture is the meter-driver circuit board.

The input-buffer circuit board. This board has twice as many components as the comparable 2-channel version.

The 4-gang volume control.

The rat's nest of wires that route the signals through the dolby, input selector, tape monitor, and 2/4-channel mode switches. Connecting all these wires must have been a laborious and mistake-prone part of the manufacturing process!

The pictures above and below show the speaker-terminal circuit board (the speaker terminals are on the opposite side of the board). The picture above shows the old protection relays, the picture below shows the new relays.

The power supply PCB. The main rectifiers are mounted on black heatsinks at the left side of the board.

The pictures above and below show the underside of the power supply PCB. The above picture shows damage (due to arcing) to the copper trace where one of the rectifiers is connected using a small screw and a nut (see the Sansui BA-3000 for another example of this). The picture below shows how we have avoided future problems by soldering the nuts to the copper trace. This sort of damage is common where rectifiers are connected to the soft copper traces using a screw. I have seen enough empirical evidence to convince me that- in the long run- this sort of connection is a bad idea.

The power amplifier board. There are two of these boards, each contains the circuitry for two channels.

The tone control circuit board.

The dolby boards. The boards (there are two) are sandwiched together. The bottom board is the same as the top.

The brand-new main filter capacitors (blue cylinders in this picture). The black rectangular box in front of the filter caps houses the dolby boards.

The vellum paper behind the tuner dial plate was replaced in order to restore the original rich blue colour. The vellum paper typically yellows with age, causing the display to take on a slightly greenish hue.

Sponsored Link

Founded in the 1950's by Saul Marantz, Marantz products arguably peaked in the 1970's, particularly with their line of 2200 series receivers. Today, the 2200 series receivers are immensely popular with audiophiles and audio collectors. Along with their power amplifiers, preamplifiers and tuners, Marantz is practically the definition of 1970's home entertainment. They won't tell you this on their website, but, unfortunately, by the time the early 1980's came along, most Marantz products were a mere shadow of their predecessors.

The 2/4-channel mode selector switch is on the back panel of the receiver, where it will not easily be disturbed. The switch setting should never be changed while the receiver is turned on!

D 'n A Electronics is a Father & Son business located in Kitchener, Ontario, Canada. We specialize in restoring hi-fidelity audio power amplifiers, integrated amplifiers, preamplifiers, receivers, and tuners. We've been repairing vintage audio equipment since long before it was considered vintage! It is our goal, and pleasure, to reliably restore hi-fi audio equipment to original operating condition (or better!). We accept shipments from across Canada, and many customers from Kitchener, Waterloo, Cambridge, Guelph, Hamilton, London, Toronto and surrounding areas find us to be within convenient driving distance. Thank-you for visiting our website, we look forward to serving you!