This sale is for a. Vintage Roland 1861 Tube Amplifier Powers on Untested. This amplifier has been power on only. No further testing has been done. Tubes glow and light lights. You will receive the exact item shown. Please make sure you look through the pictures.. We are not in on the weekends, so if a question is sent past 5:00 cst Friday we will not be able to reply until Monday. Monday-Friday 9:00 a. NO-DOA (Not Dead on Arrival). These items may be vintage, collectible, or specialty items that we do not have the technical capability to test or repair. Midwest Computer Brokers, Inc. Visit us at mcbia.
Vintage EICO HF-12 12-watt mono tube amplifier, previously modified from its original hi-fi configuration for apparent guitar/instrument amplifier use. This is an interesting restoration or further-conversion project for a tube guitar amplifier builder or vintage audio enthusiast. CURRENT CONFIGURATION – Original EICO HF-12 chassis, enclosure and transformers. Original four-position input selector removed and replaced with a front-mounted 1/4-inch input jack. Three remaining front controls: volume, bass and treble. Original rear audio inputs removed. Rear 1/4-inch speaker output jack added. Original speaker terminal strip remains, with altered connections. The 8-ohm terminal is presently unwired. Original decorative front faceplate is missing. Replacement Mallory electrolytic capacitors installed. Three-prong grounded-style power cord installed, but protective grounding has not been verified as satisfactory. Other previous wiring and component changes are visible. ELECTRICAL TESTING PERFORMED The amplifier has NOT been powered up or audio-tested. Resistance and continuity measurements were performed with a multimeter. Output transformer: – Primary end-to-end: approximately 341 ohms – Primary halves: approximately 187 and 154 ohms – Secondary G-4? : approximately 0.9 ohms – Secondary G-16? : approximately 1.3 ohms Power transformer: – Primary: approximately 40 ohms – Heater winding: approximately 0.4 ohms – High-voltage secondary: approximately 205 ohms total – High-voltage secondary halves: approximately 105 and 98 ohms No open windings were identified in the circuits measured. These are resistance/continuity measurements only and do not establish transformer performance under operating conditions. IMPORTANT ELECTRICAL CONDITION The three-prong power cord was checked for continuity between its grounding pin and the metal chassis. Meter lead resistance: approximately 0.2 ohms – Grounding pin to chassis: approximately 2.5-2.7 ohms The protective chassis-ground connection requires further inspection and verification. The power wiring, capacitors, previous modifications and overall electrical safety have not been fully evaluated. DO NOT CONNECT TO AC POWER UNTIL PROPERLY INSPECTED AND SERVICED BY A QUALIFIED TUBE-AMPLIFIER TECHNICIAN. RESTORATION POTENTIAL The EICO HF-12 originally used a push-pull EL84/6BQ5 output stage rated at 12 watts in its factory configuration. The existing instrument-style conversion offers an interesting starting point for a vintage guitar amplifier project. Actual instrument input characteristics, operating condition, output power and sound have not been verified. The amplifier could also be considered for restoration toward its original hi-fi configuration. This would require sourcing missing controls, connectors and faceplate components, tracing the wiring and making appropriate circuit repairs. Not represented as a working or electrically safe amplifier. Includes the amplifier and installed components as photographed. No additional accessories are represented as included. Please review the detailed photographs of the chassis, underside wiring, transformers, controls and connections.
This is an early Sansui SM-32 hi-fi stereo tube receiver/amplifier. The unit is untested. I have not powered it on and do not know its operating condition. It is also missing some of the vacuum tubes, so it should be gone through by a qualified technician before any attempt is made to use it. Cosmetic condition is shown in the photos. The chassis has oxidation/corrosion, age wear, dirt, scratches, and other typical vintage wear. The faceplate presents fairly well overall, but there are flaws and wear visible. Please review all photos carefully, as they are part of the description. Includes the Sansui SM-32 unit only, as pictured. No extra tubes, covers, manuals, or accessories are included unless shown in the photos.
Vintage 1940′s Bell Air Electronic Corp BAMCO 14A Tube Amplifier UNTESTED. The unit is very old and rare. We have no knowledge about functionality. Please take advantage of the zoom feature on the photos to judge cosmetics for yourself. What you see in the photos is what exactly you receive. If it’s not pictured it’s not included. If items are damaged in transit, a claim should be filed with the carrier. We can file the claim if you wish. Please save box and all packaging material for carrier inspection. We include these additional lines for our mutual protection, but if you check our feedback, you can trust that we go out of our way to ensure the satisfaction of our buyers, as our business will only be as good as our reputation. Please don’t let us know by leaving bad feedback if there’s an error, please give us the chance to make it right. If we are not sure, we say that, so please don’t expect us to take back an item if it has not been fully tested. Although it worked when we tested it, there are no warranties offered or implied. Not all equipment can be tested for 100% functionality. Some items are tested for basic power up capability only. If something is not in the pictures or description it is probably not included, unless it is specifically listed as included.
Large mixed lot of approximately 33-34 vintage vacuum / radio tubes. Includes assorted vintage brands such as RCA, GE, Tung-Sol, Sylvania and others. Most tubes are housed in vintage boxes; however, I have not verified that every tube matches the box it is currently in. Some may be good, weak, dead, mismatched or suitable only for parts/testing. Boxes show typical age-related wear including staining, writing, fading, tears and storage wear. Approximate count: 33-34 tubes. Great for vintage radio restoration, audio amplifiers, electronics projects, testing, collecting or resale.
Photos represent item and condition best. Top tuner model powers on. Bottom unit powers on intermittently. I do not have the capability to test beyond that.
Vintage Sears Silvertone Model 1485 “Six Speakers” tube amplifier head, manufactured by Danelectro during the 1960s. Chassis number 185.11050. This listing is for the amplifier head only; no speaker cabinet or footswitch is included. Cosmetic wear, oxidation, scratches and age-related deterioration are present as shown. No guarantees are made regarding operation, tubes or internal components.
THE PHOTOS ARE PART OF THE DESCRIPTION. That’s why they are included. A picture is worth a thousand words. So please study the photos and FULLY read the listing description. I mostly sell older, used items – expect them to show wear and have some flaws. I try to give the best descriptions I can. It’s possible that some items may have unobservable or internal problems or damage that I’m not aware of. I do not completely disassemble items for inspection. I avoid using UPS. I try to charge as close as possible to actual costs.
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.
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.
