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Technics su v4x and SVI2004 operating temperature
Technics su v4x and SVI2004 operating temperature
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Old 28th January 2015, 01:45 PM   #11
Redshift187 is offline Redshift187  Canada
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I took the transformer out of a Technics from that era for my chipamp, and the transformer itself runs very hot, around 50C or so in a well ventilated case, even with no audio playing (class A/B).
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Old 28th February 2015, 01:21 AM   #12
MaccAu is offline MaccAu  Australia
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I have a Technics SU-V4X. Its has a beautiful sound though runs very warm, as does my other Technics amps, the SU-V8, and G50, while the SU-V9, seems to run on cooler side
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Old 9th January 2018, 07:40 AM   #13
Leuname is offline Leuname
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Technics su v4x is my favorite in terms of sound.My question is whether it really suits to apply one OPA1612 without changing anything before or after entering this OPA1612.
it fits?

I'm not referring to physical size but to certain values ​​of components around.Thanks in advance.(as vrea sa pot discuta mai detaliat si pe romaneste cu tine rrrremus despre subiectul asta)
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Old 9th January 2018, 07:43 AM   #14
Leuname is offline Leuname
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Technics su v4x is my favorite in terms of sound.My question is whether it really suits to apply one OPA1612 without changing anything before or after entering this OPA1612.
it fits?

I'm not referring to physical size but to certain values ​​of components around.Thanks in advance
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Old 11th January 2018, 04:30 PM   #15
SVI2004A is offline SVI2004A  New Zealand
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Technics su v4x and SVI2004 operating temperature
The SVI 2004 A Power ICs do run quite warm indeed... these out of the pack of SVI series always ran the warmest... a lot to do with its inbuilt Synchro Bias. with the computer drive adding to levels...

Usually amps running these packs run approx 7K ohm to -V for current stabiliser... the computer drive replaces the resistor pull down with a transistor controlled by the ICQ Controller

A look at the internal schematic of the SVI

- as for replacing op amps... I have not yet done that... only used in phono eq and tone circuitry

Voltage amp (diff/cascade) is all in AN7062 - beware of eBay fakes.
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Old 16th January 2018, 04:50 PM   #16
Leuname is offline Leuname
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What do you think about the sound that su v4x has in comparison with su v90d and se a50?
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Old 16th January 2018, 05:16 PM   #17
SVI2004A is offline SVI2004A  New Zealand
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Technics su v4x and SVI2004 operating temperature
The A50 and V90D are more powerful

But the V4X I prefer for its sound.
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Old 17th January 2018, 07:03 PM   #18
Leuname is offline Leuname
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Thanks SVI2004A!!!
I have listened to more or fewer amplifier models from the brands: Yamaha, Marantz, Denon, Pioneer, Sony, Philips, Onkyo, Grundig, Jvc,Sansui and Technics.
We all left behind for the dynamics offered by Technics (puncky bass) and because of your opinion on the HIFIENGINE website we also bought a su v4x model,
and this is really the most superb sounding amplifier I heard.
Soon they have a Sansui they have 317 that they did not want to start until after they had sucked their dust...
I tried it for a few minutes, since it was manufactured in 1978 and the electrolytic capacitors as well as 6 fuserezistors are very affected by the passage of time and I do not want to ruin it...in these few minutes of the test I was amazed at the sound quality,I think it is similar to su v4x
in terms of bass and clarity, detailed sound.Have you ever heard the sound of Sansui AU317?

I want to replace all electrolytic capacitors on su v4x and I wonder if it would be appropriate to replace the ceramic with wima polypropylene(???)
also change the problematic transistors and add extra radiators,and change wire conectors.
I have two v4x bought and will be mine forever(thanks to you SVI2004A)
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Old 18th January 2018, 12:55 PM   #19
SVI2004A is offline SVI2004A  New Zealand
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Technics su v4x and SVI2004 operating temperature
It’s rather pointless changing capacitors as only 3-4 per channel in signal path..

1 on phono amp... 2 in tone Controller pcb and 1 in main amp

—— for the transistors beware of fakes. The original ones will last a lot longer if a little heatsink is attached to them (these can be found in better electronic wholesalers)

The memory capacitors usually need changing.. 2x 2.3v 3.3F ‘Gold caps’

Can’t remember a lot of the sansui... I have replaced output transistors on a few of them though.. (im sure it was this model)

Do enjoy your V4X amps

As far as cooling... make sure amp is level (this affects the fluid cooling system) and if using at volume make sure nothing is on top... it gets quite hot...
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Old 19th January 2018, 03:33 PM   #20
Leuname is offline Leuname
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Thanks and Thanks for the tips.
I'm sorry but I do not understand what you mean with:
*make sure amp is level *...?
I bought Panasonic GOLD CAP 10F 2.5v(do you think it would be a problem because they have a higher value?)
Previously, I bought a Kenwood ka990v which, due to inappropriate packing,has arrived broken,so I have the happy opportunity to use my original transistors in number of:4-2sc2631 and 4-2sa1123,even 4-2sc2632 und 3-2sa1124(all evil for good)
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