A rarified find for those planning to build their dream monoblock amps using some of the earlier double-triode tubes of the late pre-war era, early 1940s . Seldom seen matched as a pair. UTC's top- of-the-line LS output transformers. Gourgeous cast / engraved with raised UTC logos on top. Massive and over-engineered LS series cast shield, perfect for big monoblocks or single chassis amps, making them very desirable for amp upgrades or DiY builds…
Introduced in the late 1930s' to provide top notch, cost no object builders amps still using classic, big glass triodes, dual triodes and pentodes.
One of these LS-61's is NOS, New-in-box, and has never been soldered, with orig. package. The other is in excellent condition, used little if at all.
These are less often seen black laquer finish models from the early 1940s, just before, WWII. Bakelite terminals are solid, tight and free of cracks (they are solid and near perfect;
Very large, approx 85mm x 90mm x 110mm high, each weighs in a hefty 6lbs 10oz each
Nice looking in every way I could see . Paint on both has a few areas of age related flaws from storage, and original rivited tags have a little oxidation on screws, minor finish flaws from storage, normal for age. Original mounting screws included top and bottom. Old repeoduction UTC papers w/ connection info shown in photos also included.
The LS Linear Standard series, introduced back in the 1930s, was one of the earliest commercial grade high-fidelity transformers marketed to amp builders -- quickly becoming popular with builders and recording studios and 40s/1950s hifi fanatics. UTC LS series mostly populated the last of the big studio audio monitoring and recording / powerful record cutting amplifier applications.. helping to lay down some of the best recordings of the golden era.
The LS-61 features a split Primary 10,000 / 6,000 and Secondary with many potential configurations for output, including; 500 (line stage) ,15, 10,7, 2.5ohms to name a few! It was designed for Push Pull or Push Pull Parallel of various dual triodes to Speaker Voice Coil or Line at a conservative max of 15 watts.
Crafty builders could also apply these as alluring and powerful preamp/line stage outputs too!
Lots of potential to build a powerful amp using interesting dual-triode or triode tubes from the 1930s and 40s like 59,79, 6B5 etc!
The longevity and stability, and fit / finish of UTC's LS series were not often 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 power transformers.
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 mid 19300's through 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-61.
Those with late summer or fall 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).
