Lepai T-Amp with TA2020 - Page 125

radiosmuck · 29th August 2012, 12:32 PM

The 2amp ps only has a part number, it came with the Lepai.
Switching from the 12v 2amp to the 14v 4amp, I notice no difference in volume. What should I be hearing or not hearing, there is no hum from either unit?

Insighter · 03:44 PM

Quote:

Originally Posted by pkozul

Hi there,

Just make sure the Muse power supply is in fact 14V. Can't recall which seller I bought from, but the Muse power supply was actually only 12V even though it was advertised as 14V. My advice is to double check with the seller and also measure if if you end up purchasing.

Cheers,
Pete

I agree, receive that adapter. That store on eBay already closed. Only ordoer now sellling them. 12,43V, but works fine, can post photo of internals. Schematic not the worst, I think. Also it's not even warm when work with TA2021B. But ferrite bead on cable is probably fake )

Bare · 04:30 PM

Quote:

Originally Posted by radiosmuck

This looks a better deal
MUSE 14V 4A Power Adapter Supply for Muse M20 EX2 TA2020 M21 EX TA2021 T-Amp | eBay

Try this one: It has been ..Proven... to work well.
It makes audible difference over the 2 amp PS, at least on My Ta2020.
12V 5A LCD Replacement AC Adapter for DVE DSA-60W-12 1 | eBay

radiosmuck · 29th August 2012, 06:55 PM

Quote:

Originally Posted by Bare

Try this one: It has been ..Proven... to work well.
It makes audible difference over the 2 amp PS, at least on My Ta2020.
12V 5A LCD Replacement AC Adapter for DVE DSA-60W-12 1 | eBay

Perhaps because I am hooked up to 15 ohm speakers that only draw a few watts from the amp and is the reason I'm not hearing any improvement?

Bare · 29th August 2012, 08:40 PM

Dunno.. could be, I'm at 96/8 dB speakers.
I think you should be fitting appropriate value Output caps though; 047uf for 4 ohmers , 022 uf for 8 ohmers, ?? uf for 16 ohm?

slk23 · 29th August 2012, 09:42 PM

I received the Indeed TA2021S amp and really like it! It doesn't have quite as much gain as my unmodded Lepai (except for the 12V/5A supply) but it also doesn't go into distortion when the volume knob gets past the halfway point

Perhaps a fully modded Lepai sounds like the Indeed... All I know is the Indeed amp sounds wonderful and surpasses the Lepai even at lower volumes. I sense greater detail and naturalness; could it be that the unmodded Lepai has a small and non-obvious amount of distortion which 'smears' the music a little bit? It's subtle but in my listening acoustic guitar and cymbals have more clarity with the Indeed amp.

So far I've only tested with fairly inefficient Magnepan MMG speakers (4 Ohm, 86 dB). Compared to an Onkyo 75W amp the Indeed sounds very close but not quite as good. I expect that the difference would be hard to detect with efficient speakers since the TA2021S wouldn't have to work as hard.

TA2021S:

radiosmuck · 29th August 2012, 11:23 PM

The output of these 2020 chips according to the specs are 15W into 4 Ohm @ .1 THD and 8W into 8 Ohm @ .1 THD. I guess at 15 Ohm the output would be around 4W? This being the case then a 2 amp ps is enough?
I have a pair of sealed 4 Ohm 3 way speakers in the basement and I hooked up the lepai and tried both the 12v 2amp ps and the 14v 4amp ps and there was a notable difference in amplifier output.
Have you tried hooking up your Tannoys yet?

Bare · 30th August 2012, 12:20 AM

Tannoy's Erm ..No.. Not yet.. and Definitely not before fully trusting and having genuine experience with these Ta chip rascals.
Using a set of 40 yr old 8" full rangers.. which actually sound a helluvalot better than most all other speakers I've heard over the years and I really should be treating these with more respect

Wasn't volume I was referring to but quality of Sound that was evident with the 'stronger' PS Although 1/2 volume is too loud and the speakers don't like it.

I Believe the Output caps have genuine/direct effect on sound and IMO should be the FIRST pieces upgraded on these Amps..( Before Inductors 'fer sure')
In the very least buy some decent MKP output caps.
Ones I bought were 10 for $2

at my local shop.

Lucywy · 17th September 2012, 07:12 AM

It is lepai ta2020a?What I got is black one.

radiosmuck · 21st September 2012, 08:21 PM

According to the ta2020 specs the absolute max supply voltage is 16 vdc.
I have just picked up a 16vdc 4amp wall wart switching ps, should I try it?
Thanks

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29th August 2012, 12:32 PM	#1241
radiosmuck diyAudio Member Join Date: Jul 2012 Location: Montreal	The 2amp ps only has a part number, it came with the Lepai. Switching from the 12v 2amp to the 14v 4amp, I notice no difference in volume. What should I be hearing or not hearing, there is no hum from either unit?

29th August 2012, 08:40 PM	#1245
Bare diyAudio Member Join Date: Dec 2001 Location: vancouver	Dunno.. could be, I'm at 96/8 dB speakers. I think you should be fitting appropriate value Output caps though; 047uf for 4 ohmers , 022 uf for 8 ohmers, ?? uf for 16 ohm?

29th August 2012, 09:42 PM	#1246
slk23 diyAudio Member Join Date: Aug 2012	I received the Indeed TA2021S amp and really like it! It doesn't have quite as much gain as my unmodded Lepai (except for the 12V/5A supply) but it also doesn't go into distortion when the volume knob gets past the halfway point Perhaps a fully modded Lepai sounds like the Indeed... All I know is the Indeed amp sounds wonderful and surpasses the Lepai even at lower volumes. I sense greater detail and naturalness; could it be that the unmodded Lepai has a small and non-obvious amount of distortion which 'smears' the music a little bit? It's subtle but in my listening acoustic guitar and cymbals have more clarity with the Indeed amp. So far I've only tested with fairly inefficient Magnepan MMG speakers (4 Ohm, 86 dB). Compared to an Onkyo 75W amp the Indeed sounds very close but not quite as good. I expect that the difference would be hard to detect with efficient speakers since the TA2021S wouldn't have to work as hard. TA2021S:

29th August 2012, 11:23 PM	#1247
radiosmuck diyAudio Member Join Date: Jul 2012 Location: Montreal	The output of these 2020 chips according to the specs are 15W into 4 Ohm @ .1 THD and 8W into 8 Ohm @ .1 THD. I guess at 15 Ohm the output would be around 4W? This being the case then a 2 amp ps is enough? I have a pair of sealed 4 Ohm 3 way speakers in the basement and I hooked up the lepai and tried both the 12v 2amp ps and the 14v 4amp ps and there was a notable difference in amplifier output. Have you tried hooking up your Tannoys yet?

30th August 2012, 12:20 AM	#1248
Bare diyAudio Member Join Date: Dec 2001 Location: vancouver	Tannoy's Erm ..No.. Not yet.. and Definitely not before fully trusting and having genuine experience with these Ta chip rascals. Using a set of 40 yr old 8" full rangers.. which actually sound a helluvalot better than most all other speakers I've heard over the years and I really should be treating these with more respect Wasn't volume I was referring to but quality of Sound that was evident with the 'stronger' PS Although 1/2 volume is too loud and the speakers don't like it. I Believe the Output caps have genuine/direct effect on sound and IMO should be the FIRST pieces upgraded on these Amps..( Before Inductors 'fer sure') In the very least buy some decent MKP output caps. Ones I bought were 10 for $2 at my local shop.

17th September 2012, 07:12 AM	#1249
Lucywy diyAudio Member Join Date: Sep 2012 Location: GZ	It is lepai ta2020a?What I got is black one.

21st September 2012, 08:21 PM	#1250
radiosmuck diyAudio Member Join Date: Jul 2012 Location: Montreal	According to the ta2020 specs the absolute max supply voltage is 16 vdc. I have just picked up a 16vdc 4amp wall wart switching ps, should I try it? Thanks