Teac MA-7

Teac Armonia

1 9 7 9 1979
1 9 8 1 1981

Very rare power-amp which apparently didn't sell much, whatever the country considered.

Endorsed in Japan by Tannoy (or vice-versa :) with several joint ads and even a true / false copy of a letter from Mr. N.G. Crocker (Managing Director of Tannoy) to Teac Corp., praising the quality of the new Teac separates.

A test I have at hand shows that the measured specs are actually way above the ones specified in the manuals, especially those of the MA-7. But I really don't know who built this rare combo for Teac... Maybe JVC ?

2x 190W (40Hz...20Khz, 8 Ohm), 200Khz of frequency response, two 150VA power transformers (for the JP version), with 4x 18,000µF of caps, DC structure, multiple relay-driven protections, 1µs of rise time and 120V/µs of slew rate.
Excellent response on square waves down to 40Hz.

The MA-7 is meant to be powered through the PA-7 so the actual mains power on switch is at the back and only a confirmation LED is at the front.

DC and cap-coupled inputs are available, in RCA format ; the MA-7 can only handle one pair of loudspeakers - but with banana plugs !
A dedicated Teac rack was available : LX-550 - not pretty but all metal and on casters.


The top image is taken from a joint Tannoy/Teac ad (Stereo Sound #53, winter 1980) ; the black versions come from a german Teac catalog dated october 1981 ; service manuals are © from november 1979.

A real JP MA-7 here.

Teac MA-7, image 1 Teac MA-7, image 2
Teac MA-7 specifications
Title Value
Type : Class B DC twin-mono
Power : 2x 150W (8 Ohm, 7Hz...100Khz)
Frequency response : DC...200Khz (+0 / -1dB)
S/N ratio : 120dB (IHF)
THD : below 0,003% (10Hz...20Khz, 8 Ohm, rated output)
IMD : 0,002% (SMPTE, 8 Ohm, rated output)
Power bandwidth : 7Hz...100Khz
Slew rate : ± 120V/µs
Damping factor : 100 (DC...20Khz)
Residual noise : 35µV (A curve)
Input : 1V / 50kOhm
Dimensions : 43,2 x 14,8 x 44cm
Weight : 22kg.
List price : 180.000¥ (1981)
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page online since : july 2008
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