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Old 6th April 2011, 05:21 PM   #11
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Many thanks jean-paul !

I find interesting the "Multiway Application Circuit" with PLLXO's (Figure 18 - page 10/14) in the TDA2052 Datasheet.pdf... certainly the Sub-out of the AMP-30 uses a part of this schématics.

Just a question : when you switched from NE5532's to LME49860's in your mod, had you to change some other parts or just it was totally compatible ?
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Old 6th April 2011, 05:30 PM   #12
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Pay attention guys, a PLLXO is working on it's idle frequencies only IF the source is low Z !
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Old 6th April 2011, 05:32 PM   #13
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Originally Posted by jean-paul View Post
Don't know where you are pointing at but I actually have the amp and I also never heard a TDA2030 sound up to the standard I like. TDA2030 was designed and made in my youth and the TDA2052 is pretty recent. It can deliver enough current to my speakers which is not a a problem as they've incorporated a heavy toroid that can deliver that current. More luck than wisdom I guess but it works out very good. I just wish I could stuff so much parts in such a small case.

All I know is that the Amp-30 in this form beats several other amps I have. It is a pity that they've been costcutting in a lot of areas. It is a cheap crate made a bit too cheap with some very nice aspects to generate profit by a large margin. I even mailed Tangent that this amp could be a winner when made with some better materials worth 15 to 20 Euro.
Jean Paul : Try it on 500watts rated regulated PSU , wired on CuAg , without any printed circuit
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Old 6th April 2011, 05:38 PM   #14
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Why ? I like tidy designed PCB's with short as possible tracks and not RF attracting rats nests
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Old 6th April 2011, 07:05 PM   #15
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because 25um copperlayer doesn't stand the inrush current a stranded silver wire can afford ... difference is the sound
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Old 6th April 2011, 08:06 PM   #16
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Hi, I still have solid silver wire but I don't use it anymore despite that it should be better in some aspects. When you use silver you should use it in the entire chain. Copper and silver don't mix well sonically (thermocouple effect ?). So I went back to copper. Back to the subject please, as an ex-mod I would have encouraged us now to open another thread.
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Old 7th April 2011, 09:58 AM   #17
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Quote:
Originally Posted by jean-paul View Post
Don't know where you are pointing at but I actually have the amp and I also never heard a TDA2030 sound up to the standard I like. TDA2030 was designed and made in my youth and the TDA2052 is pretty recent. It can deliver enough current to my speakers which is not a a problem as they've incorporated a heavy toroid that can deliver that current. More luck than wisdom I guess but it works out very good. I just wish I could stuff so much parts in such a small case.

All I know is that the Amp-30 in this form beats several other amps I have. It is a pity that they've been costcutting in a lot of areas. It is a cheap crate made a bit too cheap with some very nice aspects to generate profit by a large margin. I even mailed Tangent that this amp could be a winner when made with some better materials worth 15 to 20 Euro.
That's cause i was confused , you said that TDA2052 came from another era and i thought it was in the past
Still , you didn't tell me the toroid VA
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Old 7th April 2011, 10:19 AM   #18
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TDA2030 is from another era = it is from the past. English is not my mother language but I think I expressed myself well.

The toroid does not mention VA rating but I guesstimate it to be at least 2 x 5 A. It only mentions 2 x 15 V and 1 x 12 V ( for the USB charging circuit).
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Old 8th April 2011, 06:28 AM   #19
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Originally Posted by jean-paul View Post
TDA2030 is from another era = it is from the past. English is not my mother language but I think I expressed myself well.

The toroid does not mention VA rating but I guesstimate it to be at least 2 x 5 A. It only mentions 2 x 15 V and 1 x 12 V ( for the USB charging circuit).
15V , 5A sounds slightly overkill for 20W ...
I usually use 12v 3A for 15W
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