A rarified find for those planning to build their dream monoblock amps. Seldom seen matched pair of UTC's top- of-the-line LS power transformers. Gourgeous cast / engraved with raised UTC logos on top. Massive and over-engineered Plate & Filament, perfect for big monoblock amps, making them very desirable for amp upgrades or DiY builds…
Introduced in the early 1950's to provide power transformers to top notch, cost no object builders of big, super hifi amps still using classic, big glass triodes and pentodes. And to match applications of their top dog LS 56 (and others) series of outputs... These are older gray finish models from the early 1950s. Bakelite terminals are solid, tight and free of cracks (they are solid and near perfect; one has a slight ridge around rim( cosmetic only flaw, see photo). Very large, approx 150mm x 130mm x 130mm, each weighs in a massive 17lbs each!
Nice looking in every way I could see . Paint has a few areas of age related flaws. Original rivited tags have a little oxidation on screws, minor finish flaws from storage, normal for age. Original mounting screws included top and bottom. Papers and connection info shown in photos also included.
The LS Linear Standard LS-74 was designed as a main power transformer for the last of the giant 1950s hifi -- and the last of the big studio audio monitoring and recording / powerful record cutting amplifier applications..Primary is configured for USA standard 115V AC and the secondary supplies 415-395-0-395-415V at 275 volts and 5V at 6 amps, / 6.3 volts at 5 amps.
It's become known over the years, that the power supply section is best area to obsess over. You want to put as much quality (and weight) in your amp's power section / supply. Transformers and rectifier tubes make a huge difference here. The longevity and stability of UTC's LS series power transformers were never really matched during this era, UTC's peak of build quality standards. For your next classic amp project -- you'll have many wondeful classic USA brands to choose for tube output transformers. For power transformers -- most of UTC's competitiors (Triad & Peerless) had never really invested in the design and construction of nice, large and heavy power supply transformers of this size and voltage, making the LS-74 -- the best choice in a very limited field. Modern power transformers are not so overbuilt, and cost a fortune, and rarely supply the filament and plate voltage combination of these...
Study your fitment and needs before purchase... and if you are planning or presently building or upgrading a big pair of mono block tube amps ... these are a very solid and wise investment -- you won't regret owning these in your aresenal and collection. They are guaranteed safe arrival and NO DOA. The UTC LS series were designed to outlast generations.
Early UTC's with audio applications are all now sought after -- they're great to use or collect for too many tube audio projects to name.
If you are looking to get into vintage transformers, early UTC is always a good place to start -- these are the real McCoy and known good performers. And earlier is best -- the early 1950's-1960s era produced the finest quality and most beautiful looking and sounding of this series.
These nice transformers include the papers shown, along with UTC connection info for the LS-74.
Those with big amp projects coming up take note... this may be the only set online to buy -- and they are nice, well matched -- 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.
Overseas buyers welcome, all vintage audio customers give us 100% feedback, you’re happiness is assured. Combine items for lowest price shipping (If purchasing multiple items, please email first and I will send custom invoice through ebay).
