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.

Bryston 4B Gallery

A circa 1980 Bryston 4B power amplifier. Conservatively rated at 200 watts per channel, the 4B is a great sounding amp with lots of drive and good control of the loudspeaker. You can check out the specs here.

If you have a Bryston 4B amplifier that is in need of repair, call us at (519)513-1084, or email your enquiry to repairs@dnaelectronics.ca.

This is an early (but good) Bryston 4B. Bryston has redesigned the 4B several times since it was introduced in the later 1970's.

The 4B has separate EI power transformers (and therefore separate power supplies) for the left and right channels. Each channel has 2 10000 microfarad filter cans. The power supply rails are ±75 VDC. The 2.2 uF film capacitors shunted across the filter cans are not stock.

This is not the stock lid. If I recall correctly, the stock lid does not have any air holes.

The Bryston 4B is bridgeable for mono operation. It rated for up to 800 watts(!) output into 8 Ω when bridged.

The power cord on this amplifier is not stock. It originally had a clumsy coiled power cord.

The faceplate is adorned with three LEDs. The centre, green LED is the power indicator. The red LEDs are the left and right clipping indicators. This particular amp delivered more than 250 watts per channel before clipping.

Sponsored Link

Located in Peterborough, Ontario, Canada, Bryston manufactures refined high-end audio amplifiers, preamplifiers, loudspeakers and other superb audio equipment for the discerning audiophile.

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!