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Old 18th May 2017, 07:36 PM   #1
ssi is offline ssi
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Join Date: May 2017
Default Technics SUV4X runs cool!

Hi all

I purchased a Technics SUV4X and it tunrs out to be a German market model (220v) but seems to run ok in the UK 230/240v roughly. It has a slightly different circuit board (4 copper coils near speaker terminals) and no voltage selector. Unlike my UK market model it runs cool unless you turn up the volume a lot. Why would this be? Replaced SVI2004 perhaps? A small IC chip with a heat sink does get hot and so does the speaker relay which I replaced.

Please note I am very much an amatuer but am willing to have a go and learn.

Best Wishes


Last edited by ssi; 20th May 2017 at 05:45 AM.
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Old 21st May 2017, 03:30 AM   #2
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Measuring the rail voltages may be worth a shot here. I'd expect they'd be a fair bit lower in a unit destined for 4 ohm territory, even at slightly higher mains voltage, which may explain the difference.
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Old 21st May 2017, 05:30 AM   #3
ssi is offline ssi
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Join Date: May 2017

Thanks for replying. How do I measure the rail voltage with a multimeter and what voltage am I looking for? The amp has a switch at the back to switch between higher and lower ohm speakers. I have it on 8 - 16 ohms as my B&602's are rated at 8 ohms.

In terms of sound quality the unit sounds great and has worked for hours without issue (only had it a couple of weeks), after replacing the relay.

Do you foresee any serious issues with continuing to run the amp?

Best Wishes
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Old 21st May 2017, 07:22 AM   #4
Mooly is offline Mooly  United Kingdom
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Please note I am very much an amatuer but am willing to have a go and learn.
With the very greatest of respect, it could be very easy for you to cause damage. One slip of a meter lead, a wrong range when measuring......

I would suggest you try and locate a full service manual for both variants and initially compare the circuit details. The manuals should show the supply voltages the amplifier runs on and it should also be possible to determine the current the output stage draws (I'm assume its manually adjustable although it may not be). That would be a good guide to the expected heat generation that will be produced.

Also, the relay 'getting hot' doesn't sound normal. If you replaced that part then be sure that the replacement is of similar voltage rating and also of similar coil resistance.
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