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Old 19th March 2020, 03:27 AM   #1231
AnthonyA is offline AnthonyA
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USSA-5 Build with Review
Lol that's why audiophile diyer is fun right?

When it's too revealing. Rubbish in and out effect comes in.. So need to adjust the cap.. Try a More forgiving cap like ecq or mkc and mp3 will sound better or.... Look upstream.. Something can be improved..

I'm running couple free.the most revealing way.. No problem with mp3 or low res... But I adjusted something in the dac..or I can also find a more suitable cable. Usually there is something not right there. Maybe silver cables or silver solder not good etc or too high end caps to sound thin out ..


Also don't do anything until the sound doesn't really change much.. Be careful you will be on a wild goose chase.. I normally do the final change after few months.

Happy to see another excited diyer

Last edited by AnthonyA; 19th March 2020 at 03:31 AM.
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Old 19th March 2020, 10:43 AM   #1232
manniraj is online now manniraj  India
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Thanks Anthony, all good points and noted
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Old 19th March 2020, 12:10 PM   #1233
fab is offline fab  Canada
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Thanks manniraj for the clarification update and your appreciation of the build instructions
Keep us informed of your next findings.
Fab
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Old 20th March 2020, 08:00 PM   #1234
ggetzoff is online now ggetzoff  United States
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Quote:
Originally Posted by manniraj View Post
Hello Fab, I have replaced the WIMA MKS2 cap with a Mundorf Evo yesterday and did a short listen as it was very late into the night. I will be doing some detailed listening today but so far it sounds good. I did not want to take risk of not having this cap as I keep visiting my friends and there preamp not having a cap in one of there preamps is one of the risky. Hence will be having this cap. Also will try to get the Jantzen Alumen cap as well down the line to see which one keeps me happy in my setup.

Sorry I think I did not put my views the way I intended and in no way I said like the amp is bad. My only other amplifier that I was listening to so far was M2x and hence my comparison. But I think I may have jumped the gun here as the M2x had put in more than 200 hrs being used continuously for more than an year. The USSA5 may not be more than 10 hrs. So I will reserve my comments here.

But one of the observations that my wife did listening to the USSA5 yesterday after the cap replacement is that it does bring out every instrument sound perfectly which I think we missed to hearing/observing on M2x or any other amp in my setup. Its a very revealing amplifier that is for sure as bad recording or MP3 sounds bad but good quality FLACs/WAVs sound with a very deep sound stage. May be its growing on me as so far I did not wanted to go back to M2x and that amp is packed and kept aside

By the way I am planning to build the mono blocs with USSA5 as it deserves it. I think I have not seen such a detailed documentation for any of the amps available for the DIY community. I am not from a electronics background so I just follow the build guides and with limited knowledge try to debug. But your documentation is just awesome for any new comer to the DIY world.

Thanks again
Good. Keep trying other caps. Plus, I want you to flip either the speaker connection polarity or the or the source to the amp. Tell us what you hear when you do. Obviously the speaker connections are the easiest.

Cheers,

Greg
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Old 25th March 2020, 06:05 PM   #1235
manniraj is online now manniraj  India
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Quote:
Originally Posted by ggetzoff View Post
Good. Keep trying other caps. Plus, I want you to flip either the speaker connection polarity or the or the source to the amp. Tell us what you hear when you do. Obviously the speaker connections are the easiest.

Cheers,

Greg
Thanks Greg, yes with Korg B1 I always reverse the polarity at the speakers. I have been listening like this even with M2x as well. I like this way compared to the right polarity. I think the amplifier is growing on me now after I replaced the WIMA with the Mundorf Evo cap. The amp now sounds very lively and a deep sound stage. Once this virus effect and regular movement starts planning to get the Jantzen Alumina cap. Till then will use the Mundorf and keep burning in and listen to this great amplifier and true to all the reviews it does make entire sound stage come alive and because of this garbage in and garbage out Now I am only playing FLAC/WAV/DSD/HD songs of my collection and occasionally my local Spotify for any rare to find local music.

I have a simple question/clarification on the speaker protection board in this amp. Currently I am using a single stereo protection board and the way I have connected is as below:
  • A separate single EI core transformer rated 0-12v@1A is used to power the speaker protection board.
  • I have taken the speaker out from each of the amp board and connected to the speaker in of the protection board.
  • Taken the speaker out from the protection board goes to the speaker binding post hot side.
  • I then connected the PSU ground from the Psu board to the ground of the speaker binding post. Each psu board ground individually for each channel.

This way the amp is absolutely silent and hum free even though I have placed the protection board over the PSU caps. I know this is sacrilege but this is a temporary cabinet and trying to make mono blocs so haven't mounted any boards on the bottom plate except the amp boards on the heat sinks.

Now I have a pair of mono protection boards. So when I power these 2 with 2 pairs of wires from the single EI core transformer and the same connections of speaker outputs as listed above, the amp hums horribly. Any suggestions on how do I use the pair of mono protection boards?
Should I power each mono protection board with a separate transformer? Or can I connect the speaker grounds together between the channels?

Thanks

Last edited by manniraj; 25th March 2020 at 06:09 PM.
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Old 25th March 2020, 06:31 PM   #1236
ggetzoff is online now ggetzoff  United States
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Quote:
Originally Posted by manniraj View Post
Thanks Greg, yes with Korg B1 I always reverse the polarity at the speakers. I have been listening like this even with M2x as well. I like this way compared to the right polarity. I think the amplifier is growing on me now after I replaced the WIMA with the Mundorf Evo cap. The amp now sounds very lively and a deep sound stage. Once this virus effect and regular movement starts planning to get the Jantzen Alumina cap. Till then will use the Mundorf and keep burning in and listen to this great amplifier and true to all the reviews it does make entire sound stage come alive and because of this garbage in and garbage out Now I am only playing FLAC/WAV/DSD/HD songs of my collection and occasionally my local Spotify for any rare to find local music.

I have a simple question/clarification on the speaker protection board in this amp. Currently I am using a single stereo protection board and the way I have connected is as below:
  • A separate single EI core transformer rated 0-12v@1A is used to power the speaker protection board.
  • I have taken the speaker out from each of the amp board and connected to the speaker in of the protection board.
  • Taken the speaker out from the protection board goes to the speaker binding post hot side.
  • I then connected the PSU ground from the Psu board to the ground of the speaker binding post. Each psu board ground individually for each channel.

This way the amp is absolutely silent and hum free even though I have placed the protection board over the PSU caps. I know this is sacrilege but this is a temporary cabinet and trying to make mono blocs so haven't mounted any boards on the bottom plate except the amp boards on the heat sinks.

Now I have a pair of mono protection boards. So when I power these 2 with 2 pairs of wires from the single EI core transformer and the same connections of speaker outputs as listed above, the amp hums horribly. Any suggestions on how do I use the pair of mono protection boards?
Should I power each mono protection board with a separate transformer? Or can I connect the speaker grounds together between the channels?

Thanks
Are you running separate supplies for the amp boards? If so, then yes, you are creating a loop. Thereís hum from loops created between components and loops created within components or designs. You have the latter.

Personally, I always use separate supplies with separate star grounds, or I use a single supply setup with a single star ground scheme for everything.

Back to how the amp sounds, everything in the chain can greatly effect brightness, including software. Windows 10, with a bunch of tweaks was okay, but Linux was harsh. Like I said, Iím running a boutique (canít believe it myself that I have something boutique) Linux OS for music. Itís the smoothest Iíve ever heard my rig sound.

As far as caps go, either neutral to warm is what you want with this amp. Not because the amp is harsh, itís just very accurate and your source is harsh. So, just has been already said here, harshness in, harshness out. PIO caps are good at taming that down.

Keep going and it will get there.

Itís an epic amplifier.

Cheers,

Greg
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Old 25th March 2020, 07:19 PM   #1237
manniraj is online now manniraj  India
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I think I forgot to mention that I use 2 independent transformers with 2 independent CRC psu boards to power the amp boards. My issue of hum is only when I use 2 independent mono protection boards instead of the stereo protection board. So with a pair of transformers + pair of CRC psu boards + a single stereo protection board which is powered by an independent EI core transformer the amp is absolutely dead silent.
The hum comes only when in the above setup I change the single stereo protection board with 2 independent mono protection boards powered by a single EI core transformer.

So my question was if I power each mono protection board by a different transformer will I be able to get rid of the ground loop hum and should work similar to the single stereo protection module?

Thanks
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Old 25th March 2020, 07:23 PM   #1238
manniraj is online now manniraj  India
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Quote:
Originally Posted by ggetzoff View Post
As far as caps go, either neutral to warm is what you want with this amp. Not because the amp is harsh, it’s just very accurate and your source is harsh. So, just has been already said here, harshness in, harshness out. PIO caps are good at taming that down.
Greg
And what do you think which caps fit in this category of neutral to warm, any suggestions please? PIO yes I have used in my EAR 984p clone and they were good as coupling caps.

Thanks
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Old 25th March 2020, 08:10 PM   #1239
ggetzoff is online now ggetzoff  United States
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Quote:
Originally Posted by manniraj View Post
I think I forgot to mention that I use 2 independent transformers with 2 independent CRC psu boards to power the amp boards. My issue of hum is only when I use 2 independent mono protection boards instead of the stereo protection board. So with a pair of transformers + pair of CRC psu boards + a single stereo protection board which is powered by an independent EI core transformer the amp is absolutely dead silent.
The hum comes only when in the above setup I change the single stereo protection board with 2 independent mono protection boards powered by a single EI core transformer.

So my question was if I power each mono protection board by a different transformer will I be able to get rid of the ground loop hum and should work similar to the single stereo protection module?

Thanks
Correct. You are creating a loop between the two separate supplies by tying the two protection boards together with the one supply. The protection and amp supplies on one channel need to be star grounded together, and separated from the other channel's star and supply grounds: each channel totally separated.

Cheers,

Greg
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Old 25th March 2020, 08:13 PM   #1240
ggetzoff is online now ggetzoff  United States
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Quote:
Originally Posted by manniraj View Post
And what do you think which caps fit in this category of neutral to warm, any suggestions please? PIO yes I have used in my EAR 984p clone and they were good as coupling caps.

Thanks
Is that the 834 integrated? Mundorf MCap EVO Aluminum Oil Capacitor Cap are warm, with good detail and affordable.

Cheers,

Greg
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