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Pavel Dudek's (Upupa Epops) amplifiers II
Pavel Dudek's (Upupa Epops) amplifiers II
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Old 18th December 2009, 05:39 PM   #211
bogdan_borko is offline bogdan_borko  Serbia
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Hi Upupa Epops, does EC sounds better with mosfets or bjt`s?
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Old 18th December 2009, 11:07 PM   #212
Upupa Epops is offline Upupa Epops  Czech Republic
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I have no experiences with bjt + EC, Bogdan...original Hawksford's design was with bjt ( darlington ), but at this time ( mid of eighties ) wasn't possible to get some really good ones, so better way was mosfets...results was amazing, so I was stay with them...
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Old 20th December 2009, 12:42 AM   #213
VivaVee is offline VivaVee  New Zealand
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Quote:
Originally Posted by Upupa Epops View Post
You are mistaken, difference between pad below transistor and top of nearest heatsink is only 3C, measured by digital thermometer after long time thermal shock....
Could you explain what you mean by 'long term thermal shock'?
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"If you can not measure it, you can not improve it" - Lord Kelvin
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Old 20th December 2009, 05:03 AM   #214
Upupa Epops is offline Upupa Epops  Czech Republic
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Yes: after one hour of full output power into eight ohm...

Last edited by Upupa Epops; 20th December 2009 at 05:05 AM.
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Old 20th December 2009, 07:36 AM   #215
Federmann is offline Federmann  Czech Republic
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Quote:
Originally Posted by Upupa Epops View Post
Yes: after one hour of full output power into eight ohm...
What is full output power ? Undistorted music production, or sine signal?
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Old 20th December 2009, 08:12 AM   #216
Upupa Epops is offline Upupa Epops  Czech Republic
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Nominal output power, i.e. in this case 120 W into eight, Federmann....
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Old 20th December 2009, 09:04 AM   #217
Federmann is offline Federmann  Czech Republic
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Quote:
Originally Posted by Upupa Epops View Post
Nominal output power, i.e. in this case 120 W into eight, Federmann....
I understand correctly, medium - an effective exercise power listening to music is 120W? Peak power output of 1kW far over?

Or peak power output of 120W and medium - efficient performance power listening to music is the 10W?

You never explained this
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Old 20th December 2009, 09:10 AM   #218
Sendy is offline Sendy  Czech Republic
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Dear UE, ignore him... don"t feed the troll...
http://bookreviewsbybobbie.files.wor...the-trolls.jpg
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Old 20th December 2009, 09:11 AM   #219
BV is offline BV  Slovakia
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Try to "learn at home" what mean "continous RMS power". But You are teacher at technical school.
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Old 20th December 2009, 09:22 AM   #220
Federmann is offline Federmann  Czech Republic
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Quote:
Originally Posted by BV View Post
Try to "learn at home" what mean "continous RMS power". But You are teacher at technical school.
You're right, the acoustic signal, the dynamics of a middle power - RMS is a fraction of peak performance, so I asked.
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