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Old 18th July 2003, 02:49 PM   #1
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Default TDA2050 better than LM3875 and transformer VA rating

Hi All,

I seem to recall reading somewhere that TDA2050 gave a more refined sound than LM3875 in gainclone implementations. Any views on this?

Also, I have 2x300 VA transforners (20V secondary) which I intend using for my LM3875 implementation. Is it corect to say that teh higher the VA rating of the transformer the better? I have seen that others are typically using only 120-225 VA transformers.

Ryan
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Old 18th July 2003, 03:30 PM   #2
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I fixed your mistake. I tried TDA7294 once and it wasn't as refined as LM chip.
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Old 18th July 2003, 03:46 PM   #3
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Ryan

Within certain limits higher VA rating may be beneficial for the sound. I have, however, tried a very large (1000VA) transformer once and the sound was remarkably flat and unexciting. How much you can blame on the core size, wire quality, core type etc is not very clear as these experiments tend to get very expensive. I am still determined to try high quality, very thin J-laminations with distributed gap which a local winder can get. Won't be cheap

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Old 18th July 2003, 04:20 PM   #4
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Default Re: TDA2050 better than LM3875 and transformer VA rating

Quote:
Originally posted by Dr.H
Hi All,
Also, I have 2x300 VA transforners (20V secondary) which I intend using for my LM3875 implementation. Is it corect to say that teh higher the VA rating of the transformer the better? I have seen that others are typically using only 120-225 VA transformers.

Ryan
160~200 VA is good for one channel.
I use one single 384VA toroid for the two channels.
Your 20V, 300VA transformer will do fine for two channels.
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Old 18th July 2003, 05:58 PM   #5
Mad_K is offline Mad_K  Norway
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Default Re: TDA2050 better than LM3875 and transformer VA rating

Quote:
Originally posted by Dr.H
Hi All,

I seem to recall reading somewhere that TDA2050 gave a more refined sound than LM3875 in gainclone implementations. Any views on this?
I've tried both, and I can tell you: Forget the TDA2050!
It simply stinks! Giving a very coloured sound, and is hard to get stable. Definately not suited for a minimal GC.
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Old 18th July 2003, 07:59 PM   #6
Bricolo is offline Bricolo  France
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has anyone else tested the TDA7294?
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Old 18th July 2003, 08:06 PM   #7
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that's the one that uses mosfet for output. It was the rage in the far east diy circle (last november). Said to be excellent but I never tried it myself.
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Old 18th July 2003, 08:30 PM   #8
Bricolo is offline Bricolo  France
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Yes, this one uses fets

That's the chip I use in my gainclone.
Peter sayd that he didn't like it, but I didn't compare mine to another chip (LM3875 not available here, national refuses to send me samples, and OPAs are also not available)
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Old 18th July 2003, 08:47 PM   #9
Mad_K is offline Mad_K  Norway
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Quote:
Originally posted by Bricolo
and OPAs are also not available
-So TI will not send you samples?

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Old 18th July 2003, 08:55 PM   #10
Bricolo is offline Bricolo  France
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haven't tryed
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