Stax SRA-125
Documentation on the Stax SRA-125 is thin. What survives is a single Stax advertisement from late 1975. The archive's sources have turned up no full review, no measured performance figures and no production history.
The ad is still informative. Stax's own advertising in HI-Fi-Stereo-Buyers (December 1975, p.139) introduced the SRA-125 as a new linear-coupled, all-FET preamplifier priced at $500, and highlighted that it could drive Stax electrostatic headphones directly — the SRX III headphones were offered without the usual SRD-7 adapter for direct coupling to this preamp. The same spread grouped the SRA-125 with the SRX III headphone system and the DA-300 power amplifier, positioning it as the control end of a serious electrostatic headphone setup.
Known specifics:
- Linear-coupled, all-FET stereo preamplifier
- Direct drive for Stax electrostatic headphones — no SRD-7 adapter required
- $500 list price (1975)
- Billed by Stax as state of the art in its December 1975 announcement
Past that advertisement, almost nothing is documented. There are no output, impedance or frequency-response specs, no exact production years, and no contemporary review measurements have been located.
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