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2stageEF high performance class AB power amp / 200W8R / 400W4R
2stageEF high performance class AB power amp / 200W8R / 400W4R
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Old 6th December 2017, 03:35 PM   #2651
astx is offline astx  Austria
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2stageEF high performance class AB power amp / 200W8R / 400W4R
Yep! With +/-60VDC you get exactly 200W8R or 400W4R. That was the max. supply voltage of my test bench. With 600VA transformers the max. power below 1% THD20k was due to rail voltage sagging about 220W8R.

BR, Toni
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Old 6th December 2017, 07:32 PM   #2652
thimios is offline thimios  Greece
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I have +/-100v d.c 1kW.
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Old 6th December 2017, 07:58 PM   #2653
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Quote:
Originally Posted by astx View Post
Yep! With +/-60VDC you get exactly 200W8R or 400W4R. That was the max. supply voltage of my test bench. With 600VA transformers the max. power below 1% THD20k was due to rail voltage sagging about 220W8R.

BR, Toni
I assume 60V is the DC voltage at loading caps while 200W/8ohm. What is your transformer AC voltage, how many uF's do you use?
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Old 6th December 2017, 08:13 PM   #2654
astx is offline astx  Austria
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2stageEF high performance class AB power amp / 200W8R / 400W4R
No. The +/- 60V are from my 2 regulated PS maximum setting (per PS 2x30V in serial configuration).
If you use the described 650VA transformer and the big SA2014 PS pcb the rails are sagging to 62 - 65V if you play 220W continous. One monoblock PS uses 8 x 10000uf/100V lytics.
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Old 6th December 2017, 10:47 PM   #2655
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Thanks for the info.
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Old 10th December 2017, 02:32 PM   #2656
diyralf is offline diyralf
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Hello Toni. I always find good suggestions in your post. What did you pay for the TAUSCHER-transformer? I suppose that was 1 piece? Is there a hum to hear? Since it is shed, is there any smell? Presumably it will not have primary / secondary shielding.

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Old 10th December 2017, 02:47 PM   #2657
astx is offline astx  Austria
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2stageEF high performance class AB power amp / 200W8R / 400W4R
I've ordered 6 pieces 600 VA custom made. Total cost incl. shipping was about 850 EUR. But you get them only B2B. Quality is very good. Mechanical hum only, if DC on AC line is present. No smell. Shielding can be ordered if wanted.
If you want B2C custom made transformery you can try toroidy.pl for example.

BR, Toni
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Old 11th December 2017, 07:43 AM   #2658
diyralf is offline diyralf
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Toroidy is 80% over priced.
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Old 11th December 2017, 08:18 AM   #2659
astx is offline astx  Austria
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2stageEF high performance class AB power amp / 200W8R / 400W4R
I have other experience: my custom made transformers in a stainless steel pot housing from toroidy.pl look very professional at a reasonable price. Maybe another company is able to deliver the same custom made transformers at a lower price. But we can discuss this in an extra thread where you can summarize all B2C toroid manufacturers.

BR, Toni
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Old 14th December 2017, 07:07 PM   #2660
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The homepage says that the Toroidy transformers are shielded. Do they have a separate shielding cable?
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