Super-T. Where's all the bass gone?

spikeyfaz · 3rd February 2007, 12:29 PM

In another thread I recently mentioned how impressed I was with my Super-T amp. Well perhaps I shouldn't have tempted fate as it appears that my Super-T no longer seems capable of producing any bass

.

I've had a feeling it's been on the way out for a month or two but it wasn't something I could put my finger on as I live this amp on a daily basis. I gues this 'problem' has kinda crept up on me. To compensate for the lack of bass it's also developed rather wirey shrill sound.

It's not my ears as I've borrowed my mate's Yamaha DSP A1000 and whilst this amp is not renowned for prodigious bass, it does show me what I've been missing.

I can't say I'm impressed as I've had the Super-T from new for just over a year.

Before I bin it

anyone got anysuggestions as to what's wrong?

DocLorren · 3rd February 2007, 12:38 PM

Guessing a little bit here but fact is that capacitors do not live forever. Maybe the caps in the PSU section have slowly gone. I cannot think of another simple diagnosis. Usually takes a decade or more for quality caps to degrade that much by the way.

zBuff · 3rd February 2007, 08:13 PM

could be cold solder joints, are both channels lacking bass or just one of them?

Pano · 3rd February 2007, 08:25 PM

I'm guessing caps too. But a bad solder or even loose connection may be at fault.

Does the bass come back if you shake it or thump it?

spikeyfaz · 4th February 2007, 09:03 AM

Sound is the same from both channels. I've shaken/thumped the poor old amp but no joy. I had a quick look inside but no obvious faults.

My diy skills are not up to replacing surface mount components but I figure replacing the capacitors shouldn't be too hard. Could someone perhaps post a picture of the board showing which caps I should consider replacing and with what, or at least point me in the right direction?

Thanks.

Pano · 5th February 2007, 08:51 PM

Sorry, my reply yesterday got lost in the forum glitch.

There are 3 power electrlytic caps on the board (and 2 input).

What you want to replace is the big cap near the power switch and the medium size caps near the chip. You can use the same values or larger, if they will fit. 16V minimum.

3rd February 2007, 12:29 PM	#1
spikeyfaz diyAudio Member Join Date: Nov 2005 Location: Sussex	Super-T. Where's all the bass gone? In another thread I recently mentioned how impressed I was with my Super-T amp. Well perhaps I shouldn't have tempted fate as it appears that my Super-T no longer seems capable of producing any bass . I've had a feeling it's been on the way out for a month or two but it wasn't something I could put my finger on as I live this amp on a daily basis. I gues this 'problem' has kinda crept up on me. To compensate for the lack of bass it's also developed rather wirey shrill sound. It's not my ears as I've borrowed my mate's Yamaha DSP A1000 and whilst this amp is not renowned for prodigious bass, it does show me what I've been missing. I can't say I'm impressed as I've had the Super-T from new for just over a year. Before I bin it anyone got anysuggestions as to what's wrong?

3rd February 2007, 08:25 PM	#4
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	I'm guessing caps too. But a bad solder or even loose connection may be at fault. Does the bass come back if you shake it or thump it? __________________ Take the Speaker Voltage Test!

5th February 2007, 08:51 PM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Sorry, my reply yesterday got lost in the forum glitch. There are 3 power electrlytic caps on the board (and 2 input). What you want to replace is the big cap near the power switch and the medium size caps near the chip. You can use the same values or larger, if they will fit. 16V minimum. __________________ Take the Speaker Voltage Test!

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3rd February 2007, 12:38 PM	#2
DocLorren diyAudio Member Join Date: Nov 2004 Location: Utrecht	Guessing a little bit here but fact is that capacitors do not live forever. Maybe the caps in the PSU section have slowly gone. I cannot think of another simple diagnosis. Usually takes a decade or more for quality caps to degrade that much by the way.

3rd February 2007, 08:13 PM	#3
zBuff diyAudio Member Join Date: Nov 2004 Location: NZ	could be cold solder joints, are both channels lacking bass or just one of them?

4th February 2007, 09:03 AM	#5
spikeyfaz diyAudio Member Join Date: Nov 2005 Location: Sussex	Sound is the same from both channels. I've shaken/thumped the poor old amp but no joy. I had a quick look inside but no obvious faults. My diy skills are not up to replacing surface mount components but I figure replacing the capacitors shouldn't be too hard. Could someone perhaps post a picture of the board showing which caps I should consider replacing and with what, or at least point me in the right direction? Thanks.

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