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Technics SU-VX800

Stereo Integrated Amplifier (1991-92)

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Technics SU-VX800


Power output: 110 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.007%

Damping factor: 80

Input sensitivity: 0.25mV (MC), 2.5mV (MM), 150mV (line)

Signal to noise ratio: 67dB (MC), 79dB (MM), 100dB (line)

Channel separation: 50dB (line)

Output: 150mV (line)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 430 x 158 x 429mm

Weight: 17kg

Year: 1991

Price: GBP £450 (1991)


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Reviewed Jan 30th, 2018 by

This is a very good and solid integrated amplifier. It really lacks the sexyness and good looks of older 1970's silver faced hifi equipment. As such it just looks like any boring 1990's amp, but don't let the visual design fool you. Technically it is a very well constructed amplifier, with two(!) heavy transformers and big power supply filter capacitors. (I think the US version only has one big transformer)
The performance specs are really good, but that alone does not indicate good sound, which this amp really has! While the brand Technics and these 1990's amps does not hold high regard in audiophile, I think it really holds up really really well, surprisingly well actually. The sound is very clear and detailed along with a powerful bass. It does deliver the promised 110W power into 8 Ohms with immeasurable distortion (at least for my test equipment)

This is probably the only amp I've ever experienced where I do NOT like what the loudness button does to the frequency response. It doesn't matter anyways, because the tone-control can easily be set to taste.

It also features a separate Tape Rec input selector, which allows you to do tape recording from one source while listening to another source. This allows me to make mixtapes from digital sources unattended while listening to a record or watching TV.

The best things about these black beasts and their lack of sexyness is they can be bought relatively cheap these days.



Solving heatproblem at Q652/Q654 in a Technics SU-VX800

Q652/Q654 was never moutetd on a heatsink - a major problem and big mistake. I opened some of theese (very good) Amps and it's always the same. Q652 /Q654 got so much hot, the pcb looks more ore less burned. And the soldering of these both suckers got bad, because of the heat. The other day a friend had one of theese Amps with a pretty much burned and smelly board to repair at my house. Even my VX800 board looks slightly roastet. It is my Spare-Amp, usually i run a BOSE 4401/1801 Combi with four 901 Speakers. But i like this Technics very much, if it did not had the heatproblem it was a perfect and strong Amp. So what to do? I got some Fischer Heatsinks they look like made for this problem. So i mounted one on the board with a 35mm thread bolt. In the back of the heatsink i made a connection to the main Heatsink - yust for stability, then i mounted all 4 Transistors (Q651 to Q654) on the Heatsink and with short wires i connectet them to the original connections. While i did this work i thougt about putting all the IC's on sockets and put some threads in the main heatsink to mount the transistors. I don't like this kind of self tapping screws which was originally used. Allright so i took some more time and did some more repairing including resoldering this poor soldered board.
Then came the test: Steve Miller "Macho City", Volume half turned on. Fun even for the neighbors.
Yeah! this is it. The little Heatsink went to 62°C and is stabile, everything works fine.
So I put some pics into the gallery if someone want to do this very important job too. For those who want to know more and more pics - mail me.

Greets Richard

re: Solving heatproblem at Q652/Q654 in a Technics SU-VX800

I just got the same problem with my vx800 and I would ask you if its possible to send me some pictures and more detail information how to fix. I know that the tread is old, but I decided to try it. Hop you still have the pictures.

Thank you

re: Solving heatproblems in a Technics SU-VX800

... and it goes on!
After removing the frontplate came another big surprise.
6 peaces (each 1,5 Watt 1,5KOhm) resistors (2 in a row) are producing a lot of heat. So much, the pcb is almost coal! They are current-limiters for zener-ziodes and have a 1,2W (59.9V/3000Ohms*0.02A) load. So far-so good and electrically was 1,5 Watt resistors allright. The problem is the area behind the frontplate. There is no air-flow and so theese resistors can produce lots of heat which is hangin' around at the same area. If all of this three zener-diodes have the same value, there will be a solution with a single zener and a transistor (power zener) on a heatsink, because there will be no more chance for soldering - the board is to crunchy. And while there are 59.9 volts there is no chance for just some regulators (most of them do 35 volts max.).
If the zeners are not the same value, so there will be a power-zener with 24 volts and after that comes some line-regulators - we well see.
The work goes on...

Greets Richard

next testing music will be Lynyrd Skynyrd : that smell ;-)

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