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Old 14th February 2004, 09:51 AM   #1
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Default musical fidelity transistors....

Hi All , new to the forums, but am very impressed with what I've seen so far. Had no idea there were so many audio nuts out there!
Anyway, maybe someone can help me...
I have two Musical Fidelity MA65 power amps, which someone gave me after he fried them. All that is faulty is the output transistors, which simply gone s/c . Now these devices are labelled A1000N & A1000P respectively. Now I got a set of replacements from MF cos these numbers just dont exist , very expensive they were too,21 & vat & carriage for a set of 2!
Does anybody know what they really are (2N3055/2955?!), cos I need another 4 and dont want to pay MF's crazy prices. I have an MF E300 myself which uses transistors labelled F15N, F15P.
Guess what, when the first set of replacements arrived they were labelled the same.
So its clear MF use these trannys in lots of their designs, but change the labelling to stop people like me buying cheap replacements!
Any help greatly appreciated, thnx folks.
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Old 15th February 2004, 01:14 AM   #2
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Default Re: musical fidelity transistors....

Quote:
Originally posted by raymondo
Hi All , new to the forums, but am very impressed with what I've seen so far. Had no idea there were so many audio nuts out there!
Anyway, maybe someone can help me...
I have two Musical Fidelity MA65 power amps, which someone gave me after he fried them. All that is faulty is the output transistors, which simply gone s/c . Now these devices are labelled A1000N & A1000P respectively. Now I got a set of replacements from MF cos these numbers just dont exist , very expensive they were too,21 & vat & carriage for a set of 2!
Does anybody know what they really are (2N3055/2955?!), cos I need another 4 and dont want to pay MF's crazy prices. I have an MF E300 myself which uses transistors labelled F15N, F15P.
Guess what, when the first set of replacements arrived they were labelled the same.
So its clear MF use these trannys in lots of their designs, but change the labelling to stop people like me buying cheap replacements!
Any help greatly appreciated, thnx folks.
do you have schmtc for that amp?
(just because I'm not familiar with this model).
if conditions are simillar to A1 and A100,you can use 2n3055 and BDX18 (or 2955).
mebbe even MJ15003 and his brother
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Old 15th February 2004, 07:57 AM   #3
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Default Re: musical fidelity transistors....

Quote:
Originally posted by raymondo

I have two Musical Fidelity MA65 power amps, which someone gave me after he fried them. All that is faulty is the output transistors, which simply gone s/c . Now these devices are labelled A1000N & A1000P respectively. Now I got a set of replacements from MF cos these numbers just dont exist , very expensive they were too,21 & vat & carriage for a set of 2!
Does anybody know what they really are (2N3055/2955?!), cos I need another 4 and dont want to pay MF's crazy prices. I have an MF E300 myself which uses transistors labelled F15N, F15P.

If your's amps voltage rail are +-35 volts or less , you can use the "good old" 2N3055/2955 ...if the voltage is higher, then the MJ 15003/4 will do the job!

Regards
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Old 15th February 2004, 10:22 AM   #4
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Default It's all semantics really.

Quote:
Originally posted by choky
mebbe even MJ15003 and his brother
Don't you mean his sister?
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Old 15th February 2004, 01:38 PM   #5
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i have a set of 15003 and its sibling on the way
will try those,thanks
the rails are about +-43V. there is no bias pot in these amps, but god do they run hot, they are obv biased heavily into class A
will the new trannys be biased correctly.......?!
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Old 15th February 2004, 06:51 PM   #6
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Quote:
Originally posted by raymondo

will the new trannys be biased correctly.......?!
Is dificult to tell you...without the schematic...
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Old 16th February 2004, 07:48 AM   #7
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yes, unfortuntaley i don't have a schematic, if anyone out there does that would be great, MF won't give them out, even for old designs.
I'll fit them and see, should arrive today.
Thnx folks
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Old 16th February 2004, 12:42 PM   #8
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fitted the 15003/15004
amp is now working and sounds pretty good initally, i'll see how warm it gets during the day, and give it a proper listening test to see how it compares (i have another one with original devices in)
thanks again
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Old 16th February 2004, 01:44 PM   #9
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Default Re: It's all semantics really.

Quote:
Originally posted by Circlotron

Don't you mean his sister?

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Old 17th February 2004, 03:46 PM   #10
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I use MJ802/MJ4502 on my A200 clone before, they work fine.

For your E300, if it is similar to E10, those MOSFET maybe IRF540/IRF9540.

Good Luck!

P.S. Do you have the circuit of your E300?
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