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Old 24th September 2010, 08:04 AM   #341
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mje15030/15031
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Old 24th September 2010, 09:50 AM   #342
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Quote:
Originally Posted by engel dela pena View Post
mje15030/15031
MJE340/350 in VAS, MJE15030/31 as drivers.
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Old 25th September 2010, 01:03 AM   #343
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Originally Posted by hpavictor View Post
I love this project , it is like a old school but very high quality of basical Yamaha AX series HiEnd amplifiers , this is very good sound , precision & natural 100%
Congratulations for true power !
In post #1 I say this amp was made for testing speakers, sound is good, precision and natural, but there is another adventage sound not change much with all kind of speakers wires, x-overs, and box topology (bass reflex, TL...)
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Old 27th September 2010, 12:54 PM   #344
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Originally Posted by apexaudio View Post
MJE340/350 in VAS, MJE15030/31 as drivers.
apex,
i have an old amp with 2n3055 and its matched pair 2pcs. each
i want to modify it to ultimate fidelity
how much power can this go using ultimate fidelity board
what ideal voltage and how much kva(trafo)
thanks
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Old 27th September 2010, 01:09 PM   #345
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Quote:
Originally Posted by engel dela pena View Post
apex,
i have an old amp with 2n3055 and its matched pair 2pcs. each
i want to modify it to ultimate fidelity
how much power can this go using ultimate fidelity board
what ideal voltage and how much kva(trafo)
thanks
Do you have BDX18 as matched pair with 2N3055, or you want use another 2N3055 in quasi output? Modify NX14 useing this schematic (not tested).
Rail voltage +/-30V is maximum, power 60W/4R with 100VA transformer (200VA for stereo)
Regards
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File Type: jpg APEX 2N3055.jpg (417.2 KB, 1976 views)

Last edited by apexaudio; 27th September 2010 at 01:26 PM.
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Old 27th September 2010, 03:47 PM   #346
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IF you use regulated PSU set to +/-30V, power will be increase becouse there is no voltage drop on full power. Power will be 40W/8R or 80W/4R.
Regards
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File Type: jpg APEX Regulated PSU.jpg (239.9 KB, 1789 views)
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Old 27th September 2010, 11:09 PM   #347
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Quote:
Originally Posted by apexaudio View Post
Do you have BDX18 as matched pair with 2N3055, or you want use another 2N3055 in quasi output? Modify NX14 useing this schematic (not tested).
Rail voltage +/-30V is maximum, power 60W/4R with 100VA transformer (200VA for stereo)
Regards
mj2955
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Old 27th September 2010, 11:14 PM   #348
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Originally Posted by engel dela pena View Post
mj2955
OK, for 2N3055/MJ2955 outputs use AX14 pcb with +/-30V rail voltage.
Regards
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Old 27th September 2010, 11:18 PM   #349
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Quote:
Originally Posted by apexaudio View Post
Do you have BDX18 as matched pair with 2N3055, or you want use another 2N3055 in quasi output? Modify NX14 useing this schematic (not tested).
Rail voltage +/-30V is maximum, power 60W/4R with 100VA transformer (200VA for stereo)
Regards
and this is for nx14 a bunch of irf,& 2sk
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Old 27th September 2010, 11:23 PM   #350
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Quote:
Originally Posted by engel dela pena View Post
and this is for nx14 a bunch of irf,& 2sk
Some 2SK mosfets can't be use for NX14 (2SK1058, 2SK135...)
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