Sony TA-N86B

Sony TA-N86

1 9 7 8 march 1978
1 9 8 4 1984

Bestseller of the pre-Esprit series, the N86B is the "little" one - but the best one.

Not as problematic as the TA-N88B - in fact not problematic at all - and switchable in Class A, Class B or as a Class B monoblock.

With four High fT transistors and a PLPS power supply chopping at 20Khz, the TA-N86B is a truly excellent amplifier in Class A, losing a little of its distinction when used in the other two modes.

Almost as hot in Class A as a Yamaha CA-1010, it stays cool, however, when driven in Class B or as a monoblock, but the diecast heatsinks do come handy in Class A for the idle current is to be set at 350mV !
According to the Service Manual's specs, the US and Canada models deliver more power than the AEP (EU) and UK versions...

The heatsinks have a center dent made for a long rubber band to avoid metallic resonance from the fins : theses rubber bands were never shown in the catalogs and got lost by the owners 99,9% of the time.

Japan saw a second production run with updated, larger, speaker terminals at the time of the ASCO > SOAU / DTKK T-Tag transition ('79/80), when about 6000 had been sold in Japan.
Available in silver, TA-N86, too, but only in Japan ; produced until 1984 in Japan and available in Germany until just as late, naturally.

A very successful amplifier in Germany and Japan, the total production run should be of more than 10,000 units so the TA-N86 isn't rare. Companion of the equally sure-fire bargain TA-E86B preamplifier which also sold extremely well everywhere.

I am the lucky owner of three (US, CA and FR), one having problems with its PLPS section, the other having suffered a butcher repair of the output transistors ; the US one is however working like a charm with no servicing whatsoever since 1978 !

Design-wise, reliability-wise, sound-wise and sales-wise all rolled into one, I don't think Sony ever was as successful with a high-end combo : the 86s were, and still are, perfect.

Sony TA-N86B, image 1 Sony TA-N86B, image 2 Sony TA-N86B, image 3
Sony TA-N86B specifications
Title Value
Power (US & CA models) : 2x 18W (Class A, 20Hz...20Khz)
2x 80W (Class B, 20Hz...20Khz, 8 Ohm)
2x 90W (Class B, 20Hz...20Khz, 4 Ohm)
1x 180W (mono, 20Hz...20Khz)
Power (AEP & UK models) : 2x 18W (Class A, 20Hz...20Khz)
2x 80W (Class B, 20Hz...20Khz, 8 Ohm)
2x 60W (Class B, 20Hz...20Khz, 4 Ohm)
1x 120W (mono, 20Hz...20Khz)
Power (DIN 45500) : 2x 18W (Class A, 20Hz...20Khz)
2x 80W (Class B, 20Hz...20Khz, 8 Ohm)
1x 120W (mono, 20Hz...20Khz)
20Hz...20Khz THD : 0,007% (Class A, rated output)
0,007% (Class B, rated output)
0,015% (mono, rated output)
0,003% (Class A, 1/2 rated output)
0,004% (Class B, 1/2 rated output)
0,008% (mono, 1/2 rated output)
5Hz...50Khz THD : 0,02% (Class A, rated output)
0,02% (Class B, rated output)
0,07% (mono, rated output)
0,005% (Class A, 1/2 rated output)
0,007% (Class B, 1/2 rated output)
0,03% (mono, 1/2 rated output)
0,006% (Class A, 1W output)
0,007% (Class B, 1W output)
0,025% (mono, 1W output)
IMD : 0,004% (Class A, rated output)
0,004% (Class B, rated output)
0,005% (mono, rated output)
0,002% (Class A, 1W output)
0,003% (Class B, 1W output)
0,004% (mono, 1W output)
Frequency response : DC...200Khz (+ 0 / -1dB ; DC input)
7Hz...200Khz (+ 0 / -1dB ; normal input)
Power bandwidth : 5Hz...60Khz (Class A, 8 Ohm)
5Hz...45Khz (Class B, 8 Ohm)
5Hz...30Khz (mono, 8 Ohm)
Gain/impedance : 27,4dB / 50kOhm (Class A)
27,4dB / 50kOhm (Class B)
33,4dB / 50kOhm (mono)
Damping factor : 70 (1Khz, 8 Ohm)
S/N ratio : > 120dB (IHF-A)
Residual noise : 25µV (IHF-A)
Bias : 20mV (Class B)
350mV (Class A)
Inputs : 1,1V / 50kOhm
PC : 210W max.
Dimensions : 48 x 8 x 38cm
Weight : 8kg.
Sony TA-N86B : 2 topics
(last updated topic shows up first)
  • Sony TA-N86B Caps                             (2)last updated by costellom5 - 28/11/2011, 20H06
  • Sony TA-N86B rebuild pictures                             (14)last updated by Axel - 29/02/2012, 09H21
page online since : august 2005
page updated : march 2010
page type : LGT / KNB
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