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Old 21st June 2010, 04:59 PM   #8171
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Thanks for all this information, it is very helpful, also to choose the correct heathsinks.

Yes, I've read the manual. It is very complete, compact and easy readable.

Thanks, Nelson!

Still, I need to simulate "my" psu, as I dont have a 18VAC trannie, but 20V.

Too high?

Do I have to waste some watts in higher R value in the CRC filtering?

Or do I better a CRCRC filtering, with this trannie?

Or do I wait till my money allows me to buy a 18V trannie?

Franz
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Old 21st June 2010, 05:16 PM   #8172
Blues is offline Blues  United States
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The Conrad HS, as pictured with the dimensions, can actually dissipate 100W quite nicely...that has been used with Aleph 3/30 before...so the 65W/ch F5 will run cooler on this HS.
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Old 21st June 2010, 05:18 PM   #8173
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Quote:
Originally Posted by Blues View Post
The Conrad HS, as pictured with the dimensions, can actually dissipate 100W quite nicely...that has been used with Aleph 3/30 before...so the 65W/ch F5 will run cooler on this HS.
Thanks Blues
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Old 21st June 2010, 05:46 PM   #8174
osscar is offline osscar  Latvia
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When I take my F5 (with 230V mains rating) to the UK - then the transformer started to hum. In the UK a real voltage in mains network was approximately 245V. In addition, the bias rises because the PSU Voltage increase of a few V. Perhaps it also depends on the quality of the transformer.
Now I am back from a few month business trip in my country - and transformer is silent. Here in mains - approx. 220V.
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Old 21st June 2010, 06:25 PM   #8175
Mooly is offline Mooly  United Kingdom
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Have a read at this for noisy toroids,
Mains DC and Transformers
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Old 21st June 2010, 06:31 PM   #8176
osscar is offline osscar  Latvia
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Tnx, i will read .I just shared my experience with 230V rated trafo.
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Old 21st June 2010, 07:18 PM   #8177
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Quote:
Originally Posted by Mooly View Post
Have a read at this for noisy toroids,
Mains DC and Transformers
I think Peranders has something for this. I remember reading about this a while back.

sjostromaudio.com - DCT01 The DC trap, high-end style
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Old 21st June 2010, 09:33 PM   #8178
udailey is offline udailey  United States
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Quote:
Originally Posted by bobodioulasso View Post
Most of the ever asked questions are answered in the pdf manual . From noise figures to heatsinks size. And a lot more. Reading it deeply is very informative.
True. It really is a fantastic article. I read it again a few days ago and learned more. Stuff I could not have understood the time I read it before this was now clear. There is still lots I dont understand in it and would be really nice if each paragraph was broken down yet further but man it sure is a nice article and I really appreciate the Pass Library.
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Old 21st June 2010, 10:42 PM   #8179
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Quote:
Originally Posted by Franz Gysi View Post
Thanks for all this information, it is very helpful, also to choose the correct heathsinks.

Yes, I've read the manual. It is very complete, compact and easy readable.

Thanks, Nelson!

Still, I need to simulate "my" psu, as I dont have a 18VAC trannie, but 20V.

Too high?

Do I have to waste some watts in higher R value in the CRC filtering?

Or do I better a CRCRC filtering, with this trannie?

Or do I wait till my money allows me to buy a 18V trannie?

Franz
I would go with the 20v transfo. You will get 27 to 28 volts dc which should not kill the jfets.
If you are afraid of these few more volts you can cascode the jfets.( see Cviller blog) or even use an active filter which can drop out about 4 volts.( see zen v9 article)
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Old 21st June 2010, 11:21 PM   #8180
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Quote:
Originally Posted by osscar View Post
Now I am back from a few month business trip in my country - and transformer is silent. Here in mains - approx. 220V.
Throw another thermistor in series on the AC line when it hums.

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