Teac A-4010SL

1 9 7 1 june 1971
1 9 7 2 1972

As often with Teac, available in quite a few versions : from the 1966 A-4000 and A-4000S, the A-4010, the A-4010S (1967) and the ultimate A-4010GSL in 1973.
I believe the A-4010SL to have been export-only (but I could be wrong.)

Compared to the 1960s versions, the A-4010SL brought SLH tape compatibility, separate bias & eq selectors, slightly different cosmetics and switchable meters (tape or source display) and meters' scale (+3dB) to allow better monitoring when using SLH tapes.

SLH, or Low-Noise / High-Ouptut tape, have a higher saturation point and lower inherent noise so recording levels can go further in the red :) By 3dB.

The automatic reverse mode was retained from the earlier models : automatic being if one has previously glued a piece of conductive foil at one end (or both) of the reel tape - a very manual automation in the end. Also necessary for this planned-in-advance automation : a second play head !

Soon to vanish, the center button (between the reels) sets tape tension for 1mil or 1/2 mil tapes.

The rest is early 1970s mid-end Teac : two eddy current outer-rotor motors, one hysteresis synchronous for capstan, wide-dynamic rec/play amplifiers with mic/line mixing etc.

Replaced by the A-4010GSL in 1973 with a swap of the Permalloy heads for entirely new HD Ferrite heads (but a permalloy core) and the replacement of the 1/2mil button by a "rec pause" function.

Teac A-4010SL, image 1 Teac A-4010SL, image 2 Teac A-4010SL, image 3 Teac A-4010SL, image 4
Teac A-4010SL specifications
Title Value
Heads : 2x play
1x rec
1x erase
Reel-size : 18cm & 13cm
Tape speeds : 19,05cm/s (± 0,5%)
9,5cm/s (± 0,5%)
Motors : 1x hysteresis synchronous (capstan)
2x eddy current outer rotor (reels)
Wow & flutter : 0,08% (19,05cm/s ; RMS- weighted ; playback)
0,10% (9,5cm/s ; RMS- weighted ; playback)
Frequency response : 30Hz...22Khz (19,05cm/s)
40Hz...18Khz (19,05cm/s ; ± 3dB)
30Hz...16Khz (9,5cm/s)
40Hz...12Khz (9,5cm/s ; ± 3dB)
S/N ratio : 55dB (weighted)
THD : 1% at 1Khz
Crosstalk : 60dB (1Khz)
Stereo channel separation : 50dB (1Khz)
FF time : 90s for 370m / 1200ft reel
Inputs : 2x MIC (0,3mV mini / 600 Ohm)
2x line (0,1V mini / 100,000 Ohm)
Outputs : 2x line (0,3V for 10,000 Ohm or more)
1x headphones (8 Ohm)
PC : 110W
Dimensions : 44,2 x 44,3 x 21,6cm
Weight : 20kg.
Standard accessories : empty plastic reel
reel clampers
i/o connection cords
oil and applicator
cleaning stick
AC power cord.
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