Rare, vintage 1950s matched heavy-duty power supply component set manufactured by Union Switch & Signal. This matched trio was carefully removed together from a highly specialized railroad system’s 300V regulated power supply chassis used in railroad control tower operations. This industrial-grade iron is incredibly over-engineered, making it a premium choice for high-end custom tube amplifier builders, audiophile DIY hi-fi projects, or vintage radio restorations. Why this set is ideal for Tube Amp Builders: Continuous Duty Iron: Built to zero-compromise railroad safety standards for 24/7/365 operation without overheating. Vintage Steel Core: 1950s laminations provide excellent magnetic properties and the coveted harmonic compression/”sag” that modern transformers cannot mimic. Ultra-Quiet DC Filtering: The matched L1 and L2 choke coils provide a massive advantage for smoothing out high-voltage ripple, delivering a dead-silent noise floor for sensitive audio circuits. Included in this set:(1). Main Power Transformer: Style HT / Volts: 115 / Cyc: 50/100(2) Matched Filter Choke Coils: L1 and L2 inductors matching the power transformer chassis requirements. All components feature the original, intact Union Switch & Signal identification tags complete with factory serial numbers. Physical Condition: Excellent vintage condition. The iron cores, heavy frames, and original wiring leads are fully intact.

Rare vintage 1950′s Danelectro Envoy AC/DC tube amp. Features the unique AC/DC selector. The tubes are of course included, but condition unknown. For safety: the amp should not be powered on without first understanding how the AC/DC selector works.

Sony SRA-3 Recording Vacuum Tube Amplifier in beautiful cosmetic condition, untested. The SONY SRA-3 Recording Vacuum Tube Amplifier is a vintage recording amplifier made by Sony, a classic addition to any home audio setup, offering a warm and rich sound quality. It’s historical value and the brand’s reputation make it a desirable collector’s item for audio enthusiasts. Feel free to ask any questions.

I did not plug it in, because I don’t have the proper way to use this. So I will not plug it in and turn it on.

The vintage David Bogen Sound System Model Pv-10 is a rare find for collectors of audio equipment. This sound system has been power tested and is ready for use, making it a valuable addition to any vintage audio collection. With its unique design and historical significance, this model is sure to be a standout piece for enthusiasts of radios and phonographs.

Unit is in nice condition! Indicator light turns on and the tubes heat up. Unit isn’t further tested.. I couldn’t find much information on femco but I do know they made old coal mining equipment as-well. Item is in overall good condition, item may show a few signs of cosmetic wear/flaws due to storage/use. Please view and inspect each photo before purchasing. Once receiving feedback, I’ll post a positive for you also. I ALWAYS try and work with everyone to make sure you have a pleasant experience with my sales. Cost Will Be Additional For AK, HI, PR, VI & GU.

RARE Laney Mini-Lion Portable Tube Guitar Amp – Vintage British Tone! RARE Vintage Laney Mini-Lion Portable Tube Guitar Amp – British Rock Tone in Your Pocket! Grab this ultra-collectible Laney Mini-Lion – a mini marvel from the British amp legend! Perfect for bedroom shredders, travel musicians, or pedalboard enthusiasts, it packs genuine tube warmth (EL84 power tube + ECC83 preamp) into a tiny footprint. Delivers classic Laney crunch, from sweet cleans to roaring overdrive – think AC/DC meets boutique portability. Key Features: 5W RMS output – loud enough for practice, small jams, or recording. Authentic tube-driven tone with volume, tone, and gain controls. Headphone out for silent practice. Rugged metal chassis, battery-powered option (batteries not included). Vintage condition from Japanese Hard-Off stock – fully tested, works perfectly! Cosmetic notes: Light scratches from age/use (see photos), but electronics are spot-on. Powers via 12V adapter (included) or 8x AA batteries. If you have any questions, please feel free to contact me. Please check the condition of the product in the photo. All items are in the picture. Note only for products that are turned on. Products that do not turn on are not eligible? The power supply for this product is AC100V 50/60Hz. A transformer may be required in some countries. If it is different from A type, a converter is required. You in areas other than 100V. If you use the transformer I sell, you can use it in areas other than 100V. If you have any other questions, please contact me. It may not be possible in some areas. I will take a video of the operation confirmation. You can check the video on YouTube. This service gives buyers peace of mind. (10-15 days to US). (10-30days or more to Other countries). International Buyers – Please Note.

The Rare Vintage Knight Tube Hi-Fi Integrated Amplifier/ Selector Equalizer is a sought-after piece of vintage audio equipment known for its high-quality sound and unique design. This Tube Amplifier by Knight offers a blend of vintage charm and modern functionality, making it a standout addition to any audio collection. With its integrated amplifier, selector, and equalizer capabilities, this rare vintage piece delivers a rich and dynamic listening experience that is sure to impress audiophiles and collectors alike.

Up for grabs is my vintage Mesa/Boogie Bass 400 all-tube bass amplifier head, paired with the original Mesa SUS-4 Super Shock Mount System road case. This is an early-1980s example with the classic slider EQ and dual input layout. The amp is well-maintained, functions properly, and delivers the signature Mesa low-end punch and warmth that made these a legend. The included SUS-4 shock-mounted case is a rare, high-end Mesa accessory that was built specifically for these heads. It features internal shock suspension, foam isolation, heavy touring hardware, and excellent structural protection – ideal for studio owners, touring bassists, or collectors. Condition: Clean for its age with normal cosmetic wear. Included: Mesa Bass 400 head + original Mesa SUS-4 road case. Feel free to message with questions.

This is in great condition.