Vintage Tube Amp

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.

I bought these in 2005 to build a tube audio stereo system. That system did not get built and now these original A-7s are available. Heathkit amps of the postwar era are beautiful straightforward designs that produce amazingly warm audio. The A-7 uses a 5Y3 rectifier, a 12SN7/12SL7 driver, and 12A6 output tubes. Please review the photos and forward any questions or comments.

This is a pair of Sansui HS-5 single-ended output transformers from the renowned Sansui brand. They are used but have been tested and are in good working condition. Two Output Transformers (Pair). Please refer to the photos for the included items. Type: Single-Ended Output Transformer (Pair). Dimensions (Each): 62 mm (W) × 62 mm (D) × 78 mm (H). Total Weight (Pair): Approx. Mounting Hole Spacing: 43 mm × 45 mm. Application: Vacuum Tube Amplifiers. Notes: This item has been tested and confirmed to be in good working condition. These are not included in the item price.

This particular set tests as average / used and are fairly closely matched, with all 4 date codes the same. These should still have a nice amount of life left in them. The tubes’ test results are displayed in the photos New 6L6 Spec 100% = 6,0. See the photos for physical / cosmetic condition. Also, t he tube boxes are original reused RCA boxes, and not original to 6L6s or these tubes. Additional Note: The getter flash on one tube is quite a bit more faint than the others (the one testing 82% Gm), this is purely cosmetic since as mentioned above this tube still tests satisfactory and sounds nice. Notes Regarding Tube Tests. All tubes are tested on an Amplitrex AT-1000 tester in the automatic Fixed Bias Mode (for the most conservative results). Test Results are for a general reference only, and are not a guarantee of performance, nor a guarantee of how they will test on your tester. No real world (audio) performance measurements are taken.

I have a Vintage Precision Electronics model 20 PA Amplifier. With a Cairad 400-0 Microphone and 20 inch Jenson Hypex University PA loudspeaker Model D-30. These items are untested they belonged to my great Uncle who had a traveling staketing rink he took to mining camps in KY for years.

Vintage UTC Linear Standard MLF tube amplifier, manufactured circa 1954 by United Transformer Corporation (UTC). This is an extremely rare mid-century hi-fi amplifier built during UTC’s golden era and designed around original UTC transformers throughout. Units like this rarely come up for sale in complete form and are highly sought after by collectors, restorers, and transformer enthusiasts. I do not have the proper equipment to safely power or test vintage tube electronics, and no attempt has been made to plug this unit in. Due to its age, please assume it will require service, restoration, or parts replacement before use. No guarantees are made regarding functionality. Cosmetically, the unit shows normal age-appropriate wear and patina consistent with a 1950s amplifier. There is no obvious major damage visible. Please refer to the photos carefully, as they are considered part of the description and show the exact condition of the item. This model is documented on Radiomuseum and recognized as a high-quality Linear Standard / Williamson-style hi-fi amplifier built to showcase UTC transformer technology. Additional reference information can be found here. Serious buyers who are familiar with UTC gear will appreciate what this is.

Fisher 400 Vintage Stereo Receiver Tube Amplifier Model 400 Classic Hi-Fi Audio.

Eico HF-87 Stereo Tube Amplifier. Track Page Views With.

Heathkit TA-1 vacuum tube tape amplifier/preamp – powers on, tubes function, untested for sound. Model / Series: TA-1 Tape Amplifier. Year: Late 1950s-1960s. Color / Material: Black/gold panel. Edition / Variant: Line/Mic input, 7.5/3.75 IPS equalization. Includes: Unit only, as pictured. Country of Manufacture: USA. Overall grade: Powers on, tubes function. Specific flaws: Not tested for sound output through a speaker/system – see photos for full internal view.

Curio Modern Vintage Audio. 1960s Silvertone 1472 Tube Amp. Warm Clean & Overdrive. This early-1960s Silvertone 1472 was built by Danelectro for Sears. It is a fantastic studio amplifier famous for its warm clean tones, natural tube overdrive when turned up, and a deep, swampy tremolo circuit. Original Components & Factory Specs. Collector Originality: This specific unit commands a premium due to its unswapped, factory-original vintage internal hardware, which is exceptionally rare to find intact together. Factory Jensen Speaker: Retains the original 12-inch Jensen Ceramic Speaker (Date code 220826, manufacturing code EMI220 C8138 5). The cone and basket are completely intact and structurally sound. Original Factory Cabinet: The speaker baffle board features the original factory ink stamp. Dating the cabinet assembly to late July of 1962. Original Vintage Tubes: Includes the original, factory-installed vintage American tubes: one RCA 6V6GT and one Sylvania 6V6GT. Tech & Condition Report. Power Cord Note: The amplifier retains its original 2-prong power cord. A 3-prong grounding adapter block is included to help minimize ground crackle, but the internal circuit has not been re-wired. Controls: Volume, tone, and the tremolo speed/strength knobs all function cleanly. Cosmetics: The dark grey vinyl covering shows typical vintage wear, including a split on the back upper left edge, some corner scuffs, and areas where the vinyl has peeled up. Please examine all photos closely to verify cosmetic condition. You are welcome to bring your own guitar to plug in and test it out before taking it home. CURIO MODERN. LOWER EAST SIDE, MANHATTAN. EST.