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Old 6th May 2009, 10:03 PM   #221
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It looks like these are still selling on ebay, I think I might get one.

Is there a place that sells just the bare TA2020 chips as I already have a charleze amp with a blown TA2020, and so far this seems the cheapest way of getting a TA2020 chip but it will be a pain to desolder...
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Old 6th May 2009, 10:54 PM   #222
dweekie is offline dweekie  United States
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Quote:
Originally posted by MikeHunt79
It looks like these are still selling on ebay, I think I might get one.

Is there a place that sells just the bare TA2020 chips as I already have a charleze amp with a blown TA2020, and so far this seems the cheapest way of getting a TA2020 chip but it will be a pain to desolder...


I would suggest 41hz.com for the chip, but the site shows it is out of stock right now. You may want to check back later or email.
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Old 6th May 2009, 11:43 PM   #223
col is offline col  Australia
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Just received my Lepai TA2020. I must say for cheap-as-chips amp it sounds good straight out of the box. It's also quite nice to have the tone controls. mods to follow........

col.
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Old 7th May 2009, 07:00 AM   #224
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Quote:
Originally posted by MikeHunt79
It looks like these are still selling on ebay, I think I might get one.

Is there a place that sells just the bare TA2020 chips as I already have a charleze amp with a blown TA2020, and so far this seems the cheapest way of getting a TA2020 chip but it will be a pain to desolder...
Hi Mate, this guy was selling one.
Don't know if he still has it though....
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Old 7th May 2009, 05:02 PM   #225
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I forgot to mention 41Hz.com but they've been out of stock of the TA2020 for a while so I'm not holding my breath!
Quote:
Originally posted by Lostcause


Hi Mate, this guy was selling one.
Don't know if he still has it though....
Ooo, didn't think to check the classifieds, cheers I'll send him a mail.
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Old 8th May 2009, 05:05 AM   #226
col is offline col  Australia
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Default Hot Rodding the Lepai TA2020

Had a good go at my Lepai last night. On the PCB the values are marked for each component. If you start looking closely at the components though a lot of them are wrong. I replaced a whole heap of stuff. The biggest improvement is to be had from clearing up the tone control section. By removing all the resistors and putting in matched pairs of the correct values and then changing the Pots (i used Tawian Alpha 100k log pots), this balances everything out nicely. changed most of the electros and put some poly film caps in as input caps. Changed the op-amp with a socket and LM4562. The amps is transformed and the tone controls are actually nice and smooth once working correctly.

some photos:

http://minirig.org.au/2009/05/08/hot...-lepai-ta2020/

col.
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Old 8th May 2009, 01:50 PM   #227
Gmorris is offline Gmorris  United States
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Nice work Col.

Were the original input caps 10uf on your Lepai? Did swapping in the correct values (2.2uf) affect the turn on/off thump?
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Old 8th May 2009, 02:08 PM   #228
Pano is offline Pano  United States
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Yes - nice work!

I am very surprised to see this thread still in action. My Lepai amps lie dormant in a box somewhere, haven't touched them in ages.

The PCB that Col shows does not look like mine. Have they changed? What did I miss? It looks like a cahnge for the better.
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Old 8th May 2009, 05:06 PM   #229
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Dear All,

Last month, I brought a Lepai TA2020 from Taobao. The sound is quite good in fact.


After I read your post, I am interest in mods. Somebody, change the Opamp and somebody is by pass the Opamp.

Which one produce better sound?

One more thing, I cannot find the link how to by pass the Opamp.


Thank in advance.
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Old 9th May 2009, 01:52 AM   #230
col is offline col  Australia
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Default change tone control ceremics to green caps

Iv'e just done one more mod to the tone section. I replaced all the ceramics with green caps.

http://pix.minirig.org.au/main.php?g2_itemId=976

I think the advantage that the Lepai has over the other TA2020 amps is that it has a tone control and op-amp pre. In it's un-modded state though this is poorly implemented. If you want to get the best sound for less cost then it is probably better to bypass the tone controls and op-amp. However, if you are willing to buy new pots, op-amp, resistors and green caps, then keep the tone control! It actually works really well and opens up the potential of having a nice op-amp pre.

I replaced the 10uF input caps with 2.2uF, the other 10uF caps I replaced with better quality 10uF. I still have the turn on pop. I don't think replacing them with 2.2uF will change that but I don't have any 2.2uF to try it. If it works for someone else I'll give it a go.

cheers,
col.
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