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Old 19th March 2011, 10:30 AM   #1571
BMW850 is online now BMW850  Netherlands
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Default Magnatec BUZ901/BUZ906 Maximum Drain Source Voltage 200V

Are the 200v Magnatec better than the 160v or make that no difference??
I think it's only depend on the transformer you use.

Rudy

Quote:
Originally Posted by NagysAudio View Post
Here's a complete list of all the MOSFETS and equivalents that can work in this amplifier:

Plastic Case:

Hitachi 2SK1058/2SJ162 (Obsolete)
Renesas 2SK1058/2SJ162
Hitachi 2SK1057/2SJ161 (Obsolete)
Renesas 2SK1057/2SJ161
Hitachi 2SK1056/2SJ160 (Obsolete)
Renesas 2SK1056/2SJ162
Exicon ECX10N16/ECX10P16
Exicon ECX10N20/ECX10P20
Magnatec BUZ900P/BUZ905P
Magnatec BUZ901P/BUZ906P
Magnatec BUZ902P/BUZ907P
Magnatec BUZ903P/BUZ908P

Metal Case:

Hitachi 2SK135/2SJ48 (Obsolete)
Hitachi 2SK134/2SJ49 (Obsolete)
Hitachi 2SK133/2SJ50 (Obsolete)
Hitachi 2SK176/2SJ56 (Obsolete)
Hitachi 2SK175/2SJ55 (Obsolete)
Exicon ECF10N16/ECF10P16
Exicon ECF10N20/ECF10P20
Magnatec BUZ900/BUZ905
Magnatec BUZ901/BUZ906
Magnatec BUZ902/BUZ907
Magnatec BUZ903/BUZ908

As you can see, there are MANY choices out there. All are fantastic MOSFETS and will work 100% in the Goldmund schematic.

NOTE: THE IRF HEXFETS WILL NOT WORK IN ANY GOLDMUND SCHEMATIC. PLEASE BE CAREFUL!
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Last edited by BMW850; 19th March 2011 at 10:44 AM.
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Old 19th March 2011, 10:55 AM   #1572
AndrewT is online now AndrewT  Scotland
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Hi,
because there is virtually no secondary breakdown to take account of, the FETs do not benefit from using excessive Vds capability.
Use sufficient Vds to meet the worst case rail to rail voltages that your build will impose.

If you have +-80Vdc supply rails when properly biased up and mains is at nominal voltage. If then the worst case rail to rail could be 182Vdc (+-91Vdc). This would preclude the use of both the 160Vds and 180Vds devices.
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Old 19th March 2011, 10:56 AM   #1573
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Quote:
Originally Posted by BMW850 View Post
Are the 200v Magnatec better than the 160v or make that no difference??
I think it's only depend on the transformer you use.
For anything above 50Vac secondaries, better not make it a stiffy.
Otherwise, pick the 901/906.

(you gents do know these parts can be ordered straight from the Semelab outlet at best rates)
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Old 22nd March 2011, 09:39 PM   #1574
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Please do forgive my out of time question, but which is the final schematic for this project?

I have two Goldmund clone schematics: one with two output pairs of BZU900/905 and another with three pairs of SK134/SJ49. Small differences in the VAS capacitors too.

Which is the "right" one?
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Old 22nd March 2011, 10:38 PM   #1575
Liliya is offline Liliya  Norway
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There is no "right" one.

BUZ 900/905 is a "modern" version of 2SK134/SJ49. They are equivalent and can be used either to build a Goldmund clone with two or three pairs of FETs (different output effect alteratives)
Should you be lucky enough to buy 2SK134/Sj49, you must expect a pretty stiff price. Exicon is a third alternative.

Eivind Stillingen

Last edited by Liliya; 22nd March 2011 at 10:42 PM.
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Old 23rd March 2011, 11:00 AM   #1576
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OK. BUZ it is.

Which post number or page shows the schematic that is being used on the current pcb?

Are two or three pair options being considered?
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Old 23rd March 2011, 12:15 PM   #1577
Liliya is offline Liliya  Norway
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Carlmart

Schematic for the two pairs vertion, Memesis 3, you can read about here:
Goldmund Mimesis 3 Clone, World's Best Amplifier!!!!


Memesis 9.2:

FileFactory Folder view - goldmund

Eivind Stillingen
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Old 23rd March 2011, 12:52 PM   #1578
farl is offline farl  United Arab Emirates
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Quote:
Originally Posted by carlmart View Post
OK. BUZ it is.

Are two or three pair options being considered?
maybe this will help......
PCB order for Goldmun clone


Farley
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Old 23rd March 2011, 11:13 PM   #1579
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anyone tell me if some devices I have in a fair quantity used but all good are??
have some Hitachi J K series 176 56 82 hmm so long cannot cannot remember the comp to 82 anyway some of them too
I only use them as drivers for mine so are they worth anything did have some new unused 176 56 somewhere
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Old 23rd March 2011, 11:36 PM   #1580
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Quote:
Originally Posted by CHARLIEB999 View Post
have some Hitachi J K series 176 56 82 hmm so long cannot cannot remember the comp to 82
Luveley. And Sony VFET's, no less (J28).
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