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Old 31st October 2010, 05:00 PM   #1051
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Well I don't appreciate the person attacks of the "as usual", but I was referring to the original devices used as I thought this was a clone?
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Old 31st October 2010, 05:17 PM   #1052
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For those who would like to etch their own boards, would Alex kindly provide, say, PDF files for both sides?
Thanks a lot.
Regards,
Max.
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Old 31st October 2010, 05:48 PM   #1053
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Magnatec BUZ900/BUZ905 MOSFETS are identical to Hitachi 2SK134/2SJ49. The only difference is that they're from a different brand. How does that not make it a clone?

With that type of logic we would have to use the original Philips capacitors, Vishay resistors, Huber & Suhner wire, Vampire binding posts, etc.

It's ok to use different brands for parts, as long as they're equivalent. And yes, it will still be a clone
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Old 31st October 2010, 05:53 PM   #1054
alex mm is offline alex mm  Romania
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Default PDF files ....not useless ?

....circuit is double sided with metallised holes, such as electrolytic capacitors how will soldered on top ground plain ?
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Old 31st October 2010, 06:13 PM   #1055
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Would LS5911 from Linear Systems fit 2N5565? Would you kindly point another equivalence for that part? Thanks.
Max.
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Old 31st October 2010, 06:20 PM   #1056
Krisfr is offline Krisfr  United States
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Quote:
Originally Posted by alex mm View Post
....circuit is double sided with metallicized holes, such as electrolytic capacitors how will soldered on top ground plain ?
When drilling the holes for the board in the NORMAL places(holes) right next to the necessary ones needed for parts like the Electrolytic, drill a small hole in the pad and solder a short jumper in it or two if the pad is big enough and needs it. Think and innovate.
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Old 31st October 2010, 06:34 PM   #1057
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Smartx21 - There is no current equivalent to 2N5565, but that shouldn't scare you away. There are hundreds of electronic parts distributors on the web that sell them. It's a readily available part. I posted some quick options, please go to this thread and read post # 34:
PCB order for Goldmun clone
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Old 31st October 2010, 06:36 PM   #1058
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Bill Murray and Andie MacDowell ??
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Old 31st October 2010, 06:56 PM   #1059
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Well it's just you went on and on and on about the hitatchi devices being superior to everything earlier in the thread, so I wasn't sure.
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Old 31st October 2010, 07:29 PM   #1060
Liliya is offline Liliya  Norway
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Nagys

I want your comments:

Transformer: The seller told me that the transformer I bought was 2x70 VAC. My plan was to unwind down to 2x60 VAC. To day I have measured, and the transformer turns out to be 2x50 VAC.

---Quote (Originally by ivodonchev)---
2. Lowering the +/-80V at output stage down to +/-50V will NOT LOWER the power of the amplifier and will not increase THD. I think that Goldmund's reason to use 80V is probably sonic performance not measurable. At the some time with +/-80V at high power and 4 Ohm load the output mosfets will go out of power range easily. Probably that's why they use not oversized transformers and only 4700uF capacitors because this will give around 73V at high power and low load. This will be a little bit safer for output mosfets.
---End Quote---

According to what "ivodonchev" claims, 2x50VAC will be ok for the output stage. But what about the input stage? From an earlier post I remember that you said the power to the input stage should be taken from the 60VAC before the bridge. Will 50VAC be “good enough” for the input stage?

If not, can the last 10VAC be created in the way I did when I built my LFA 50 years ago:
A 2 x 9VAC transformer together with another 2x22VAC in order to achieve 2x 30VAC.

In the “Golmund case” 9VAC together with my 50VAC (1000VA, overkill I know) = 60 VAC for the input stage.
(For those who are interested search for LFA50 and look at the power schema).

Have you read my proposal about source resitors in post 1038 for those who want that possibility?

Nagys says:

"I want to start building and also start a new thread on the process to help everyone who will be building alongside".

I am looking forward to this help from you. A very good offer.

Eivind Stillingen
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