hi there!
mj series sounds better than 2n3055 And complementary, in a musical fidelity a100? I mean : can I upgrade with these transistors? what's the difference in sonic performances?
thanks walter
mj series sounds better than 2n3055 And complementary, in a musical fidelity a100? I mean : can I upgrade with these transistors? what's the difference in sonic performances?
thanks walter
From reading Mark Hennessy's page, the MJ15003/4 will drop right in and be a hell of a lot more reliable than the remarked MJ2955/2N3055. I doubt it'll improve the sound any, though.
"what DC voltage is on the supply rails of the MF a100?"
The MJ15003/04 are 140V vs the 3055/2955 being 60V, so it shouldn't be a problem.
"I doubt it'll improve the sound any, though."
The MJ15003/04 have higher Beta at higher collector currents, so the distortion will go down a bit (but even though it will measure better, there may be no big difference in the sound).
The MJ15003/04 are 140V vs the 3055/2955 being 60V, so it shouldn't be a problem.
"I doubt it'll improve the sound any, though."
The MJ15003/04 have higher Beta at higher collector currents, so the distortion will go down a bit (but even though it will measure better, there may be no big difference in the sound).
Hi,
the reason I asked at what voltage the MF run with, was to allow assessment on whether the 2955/3055 was a suitable transistor in the first place.
It the existing transistors are unsuitable then anything with sufficient SOA will be an improvement, even if only that it does not blow up and irrespective of sound quality.
What voltage does the MF run at?
the reason I asked at what voltage the MF run with, was to allow assessment on whether the 2955/3055 was a suitable transistor in the first place.
It the existing transistors are unsuitable then anything with sufficient SOA will be an improvement, even if only that it does not blow up and irrespective of sound quality.
What voltage does the MF run at?
Hi,
+-25Vdc should allow most lower voltage power transistors to work.
I guess that voltage would allow about 25W into 8r. Does that seem right?
Any of the beefier and/or more modern semis would make a good replacement.
Do you need To3 or To220 or To247 or some other package?
+-25Vdc should allow most lower voltage power transistors to work.
I guess that voltage would allow about 25W into 8r. Does that seem right?
Any of the beefier and/or more modern semis would make a good replacement.
Do you need To3 or To220 or To247 or some other package?
They are TO-3 devices in the A1. They run at quite a high dissipation and it's been known that the 2955/3055's often give out under the thermal stress.
Be sure of which A1 you have. The Final edition is actually a rebadged B200 which is MOSFET outputs.
You really can't do better than Mark's page on this:
http://www.mhennessy1.f9.co.uk/mf_a1/index.htm
Everything you could want to know is there pretty much 🙂
Be sure of which A1 you have. The Final edition is actually a rebadged B200 which is MOSFET outputs.
You really can't do better than Mark's page on this:
http://www.mhennessy1.f9.co.uk/mf_a1/index.htm
Everything you could want to know is there pretty much 🙂
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