matched pair of the now quite scarce Triad HS 56 V transformers. Fully tested, perfect stereo pair. Guaranteed safe arrival, no DOA. Gleaming original paint. The HS-56 is famously considered one of the best line to line, and line to output transformers ever made. These are the HS 56V which was a milspec edition of the standard HS 56. The HS series received the highest level of shielding, more than most other potted transformers…
Decidedly better than most, and equivalent to the best, most expensive models … from even their top competitors of the time, including Peerless and UTC. Removed from NOS audio equipment many years ago. Gleaming original paint, with only a few nicks from storage. All printed letters and pinouts are legible. Triad was once one of the top 3 revered USA transformer manufacturers. Their HS series were used in on countless famous HiFi, Cinema and Recording studio preamps. These are from the early 1960s. A very nice looking and wonderful functioning, matched performance pair, in every way I could see.
Over the years, the HS 56 has been favored by many audiophiles for use between line stages, for both isolation and smoothing. It's one of the best matching/bridging transformers ever made in it's size (about 44mm wide x 39mm long x 64mm tall)and with an exceptionally HiFi friendly (spec'd by Triad at 10hz to over 30,000hz) frequency response rating. It features "P3" shielding, a double nickel alloy treatment, rarely seen in other makes.
Sincerely overbuilt, beyond even typical 1950s industrial, recording and broadcast standards. Triad Transformer Corp, got their start in the late 1930s, California USA. By the 1940s, they were supplying the then busy Sound on Film business, then centered in Hollywood. Many of the highest quality builders used Triad -- including Westrex (the Sound on Film and Export division of Western Electric), Langevin and later the busy HiFi industry of the 1950s.
The HS 56 V is an extremely versatile transformer, able to act -- depending on application, as a line level bridging, matching, for some cases input (see photos for impedance selections). They have many HiFi and recording audio uses -- starting with a LoZ friendly 62.5 ohms, then line level and bridging 150, 250 and 600 ohms, these selections on mirrored on both Primary and Secondary sides.
Excellent today for collectors, audiophiles and recording professionals. Triad were expensive and are premium quality. The HS 56V has premium shielding and are well documented line input, bridging, isolation and smoothing -- They're a good choice -- highly regarded for the for reliably top notch sound -- Study your application carefully before purchase -- if these are right for you, they’ll serve very well and look great in any serious HiFi project.
Rarely found in such gourgeous shape. Buy Now to avoid a bidders war, they will sell quickly. Reliable performance is assured with these, they are guaranteed no DOA and will be packed in a double box to assure safe arrival.
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