Threshold S-300
Little is documented about the Threshold S-300. The archive's fact sheet has no verified specifications, production dates or design notes for it. The period-review search turns up no item that describes this model directly.
The nearest contemporaneous coverage is a January 1988 new-products item in HI-Fi-Stereo-Buyers (p.16) about Threshold's Stasis power-amplifier line. It reported that Threshold had upgraded its S-series amplifiers with an optical bias control. It also said the S-series amps were biased to run in pure Class A up to about 20 percent of maximum output. The S/500, shown in the item, was rated at 250 watts per channel into 8 ohms. That confirms the S-series was in Threshold's line at the time. The item does not name the S-300 or give its ratings.
Surviving information on this model is thin. If you own an S-300 or have original literature for it, the archive's record would be stronger for it.
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