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For sale: a Heathkit – MA-12 mono valve power amplifier, manufactured by Daystrom Ltd. in Gloucester, England.
The MA-12 is a compact British-built tube amplifier from the classic Heathkit era, using a push-pull pair of EL84 output valves. It was designed as a high-fidelity mono power amplifier and could also be used as part of a stereo system when paired with a second MA-12. The original specification rates it at 10 watts RMS / 12 watts maximum.
This example has recently been serviced and tested.
''Please ask us for a shipping quote for the best shipping rates. Shown costs might be incorrect, or we can offer better services''
Cosmetic condition:
Used vintage condition with visible signs of age and previous use.
Scratches, marks and small paint chips on the chassis
Age-related wear to the transformers, metalwork and valve bases
Some components and transformer sections have previously been wrapped/taped
Overall appearance is original and unrestored rather than cosmetically refinished
Please inspect the photos carefully for the exact cosmetic condition
Working Condition
Tested and working
Valves power up normally
Hum balance has been adjusted
Amplifier passed its recent functional test
Service Preformed:
2 output valves replaced
Hum adjusted
Tested: OK
Specs:
Power output: 10 watts into 8Ω (mono)
Frequency response: 20Hz to 30kHz
Total harmonic distortion: 0.15%
Damping factor: 30
Input sensitivity: 0.12V
Signal to noise ratio: 85dB
Valve complement: 1 x EF86, 1 x ECC83, 2 x EL84, 1 x GZ34
Dimensions (LxWxH): 11-1/8 x 6-3/4 x 5-3/4 inchesWeight: 8 KgVolts: 100-240v (If it’s 200V or higher, you’ll need an adapter in the USA)
We ship worldwide.For international shipping, import fee's apply. These vary per country, and are for the buyer to pay.-Shipping in the EU up to 30 KG (max)-Shipping outside of the EU up to 20 KG (max) Shown costs might vary. Please ask us for a shipping quote for the best rates!-We kindly ask you to reach out for the best shiping rates. As rates vary per shipper, we can ask custom shipping quotes.
Please note: ‘’Whenever an item exceeds the weight noted above. Please ask for a shipping quote before making a purchase. The shipping costs are estimated in our shop because we do not know the shipping address.
Picking up the item is also possible. It can be picked up in Alkmaar
Delivery by us is also possible in some cases. Please reach out to us for more information about deliveries State of listing: If a listing is listed ''for parts or not working'' returns are not accepted.
When we offer our products with the notice ''Serviced'' or ''Fully serviced'' that means the device is either ''serviced'' with a new belt, and cleaned the pots, Or ''Fully serviced'' recapped, Quiescent current adjusted etc as expected from a full service
This is a fair ask, assuming the MA-12 is professionally serviced as implied by comparable listings. At US$1,607, it sits around the going level for a restored example, rather than looking like a bargain; untested or unrestored units should be dramatically cheaper.
The MA-12 is an appealing vintage mono tube amplifier: compact, characterful, and capable of making a revealing low-powered system sing, especially with efficient speakers. A serviced example with fresh capacitors, tested or replaced tubes, quiet operation, and a healthy output transformer can justify the money, and its relative rarity adds appeal. Before buying, confirm exactly what “serviced” means, ask for internal photos and test results, and verify that the power transformer, controls, and output are stable after warm-up.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Heathkit traces its origins to 1911 in the United States, when Edward Bayard Heath founded an aircraft company in Chicago after acquiring the Bates Aeroplane Co. Renamed E.B. Heath Aerial Vehicle Co., it pioneered kit-built planes like the 1926 Heath Parasol. Following Heath's death in a 1931 test flight, Howard Anthony acquired the bankrupt firm in 1935, shifting focus to aircraft accessories in Benton Harbor, Michigan. Post-World War II, Anthony pivoted to electronics in 1947 with surplus parts, launching the iconic O-1 oscilloscope kit for $50—a bestseller that birthed the Heathkit brand and its DIY ethos.
In hi-fi audio, Heathkit earned acclaim for tunable amplifiers, integrated receivers, preamplifiers, tuners, and speaker systems, all sold as meticulous assembly kits from the 1950s through the 1970s. Standouts included the AA-151 and A-7E power amps, known for their robust tube and solid-state designs, alongside full stereo systems like the AR-15 receiver. The brand expanded into test gear and amateur radio but prioritized high-fidelity components for home enthusiasts.
Heathkit occupied a mid-tier market niche, delivering exceptional value through user-assembled kits that rivaled factory-built rivals at half the cost. Prized for reliability, customization, and warm sound signatures, these vintage pieces command collector status today among audiophiles restoring "kit-built" icons. Though production ceased in the 1980s after Zenith's acquisition, Heathkit's legacy endures as a cornerstone of DIY hi-fi heritage.
See all Heathkit listings on RADAR.
