Stax SRD-6SB Electrostatic Earspeaker Adaptor

Connect Vintage Stax Earspeakers to Your Amplifier

The SRD-6SB provides the interface between a conventional speaker amplifier and compatible Stax electrostatic earspeakers. Its transformers step up the audio signal to the level required by the electrostatic drivers.

For an owner with a suitable amplifier already in the system, an adaptor of this type provides a route to using vintage Stax headphones without a separate dedicated driver amplifier.

Self-Bias Operation

The SB designation identifies the self-bias design, which derives the bias supply from the incoming audio signal. The adaptor therefore operates without its own mains connection, while still requiring an external amplifier to supply the music signal and power.

Check Normal-Bias Compatibility

This model belongs to the older Normal-bias Stax system, associated with the six-pin connection and nominal 230V bias. It does not provide a 580V Pro-bias output. A five-pin Pro-bias headphone requires a suitable Pro-bias driver for its intended performance.

Technical Details

• Manufacturer / model: Stax SRD-6SB, also marked SRD-6/SB
• Type: Transformer-coupled electrostatic earspeaker adaptor
• Input: Stereo speaker-level signal from an external amplifier
• Earspeaker connection: One Normal-bias six-pin socket
• Bias supply: Self-biasing; no separate mains supply required
• Switching: Earspeaker / loudspeaker selection
• Introduction: 1978

Important Owner’s Notes

Use the amplifier’s speaker outputs; a source component’s line output cannot drive this adaptor directly. Conventional dynamic headphones with a 3.5mm or 6.35mm plug also require a different type of headphone connection.

Switch the amplifier off before making connections, observe channel and polarity markings, and begin listening with volume low.

Why Buy From Us?

Wilkinson’s Hi-Fi has more than 40 years of experience selling second-hand hi-fi, with practical advice from an established family dealership.

• Three-month guarantee: Included for reassurance after purchase.
• Clear descriptions: Cosmetic grading and pre-sale checks disclosed before you buy.
• Dealer accountability: Greater reassurance than an unverified marketplace listing, with an established business to contact.
• Careful packaging: Equipment prepared securely for dispatch.
• After-sales support: Connection and compatibility advice by phone or email.
• Competitive pricing: Set with the wider second-hand market, including eBay, in mind.

Summary

A useful component for a compatible vintage Stax setup. This listing is for the adaptor only