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Old 19th November 2005, 11:19 PM   #1
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Default New Naim Output Transistors

The new series of Naim amplifiers has an unusual output device. From their website:

"A bipolar transistor with a specification combination of very high current, power rating and bandwidth was needed, far in excess of anything available to Naim before. A suitable output device was eventually developed after six years' collaboration with a semiconductor manufacturer.

"These outstanding components each provide up to 80 Amps and 350 Watts, negating the need to use parallel pairs of transistors (which always have a negative effect on sound). Additional 007 transistors are used in the fully regulated power supply, ensuring the very best performance."

My understanding is that Naim uses quasi-comp output stages, so I would assume that these are NPN only. This is still an extremely robust part. Does anyone out there have any more information on these parts?
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Old 19th November 2005, 11:46 PM   #2
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Default Naims own custom design

Not available I'm afraid, custom designed and manufactured for Naim exclusively, love to try them though!

RC
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Old 19th November 2005, 11:56 PM   #3
sss is offline sss  Israel
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Default Re: New Naim Output Transistors

Quote:
Originally posted by Charles Hansen
" negating the need to use parallel pairs of transistors (which always have a negative effect on sound).."
yeah right
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Old 20th November 2005, 01:26 AM   #4
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Does anybody know what package they are in? It would have to be pretty darned big to safely dissipate 350 watts.

Any guesses on the manufacturer?
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Old 20th November 2005, 02:13 AM   #5
jam is offline jam  United States
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I don't if this would be of any help .............

Transistors NA001 MJ15003 output transistors, BUV20 also good but expensive Farnell 3
Nait One Trannies
Try: BD711 - NPN & BD712 - PNP, both 12A @ 100V, 75W TO220 NPNs are numbered 003, PNPs numbered 004

ZTX384s may be replaced by BC182 or BC546. Also ZTX651Q & 751Q
NA005 BD743's will replace the NA005s- recommended by Naim.
ztx 653 npn used to replace ztx 652 N/A N/A N/A


Jam
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Old 20th November 2005, 03:34 AM   #6
jam is offline jam  United States
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Charles,

From some review I learnt that the transistor has a house marking of NA001. A review is in issue #8 of Hi Fi+ (NAP500) might shed some light on the subject, sorry I do not have that issue.

From my post above, taken from some web site, it seems that the NA001 is a MJ15003 which makes it a Motorola TO-3 device..............but then again I could be wrong.

Regards,

Jam

PS The NAP500 is a bridged amp rated at 140W, may be the lower rail voltages....................., there is also the Motorola BUV20 which is more likely (higher ft )

http://www.alldatasheet.com/datashee...OLA/BUV20.html



............or it might be some OEM Sanken device.
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Old 20th November 2005, 03:55 AM   #7
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Hi Jam,

Thanks for the detective work. The Naim website calls this part the "007", so I think it is different than the "001" Motorola part. I think I have issue #8 of Hi-Fi+ at work. I will look for it on Monday.

Thanks,
Charles
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Old 20th November 2005, 04:08 PM   #8
anatech is offline anatech  Canada
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With that power, they may just be using a new industrial package part. Since they like NPN devices, they don't need a compliment.

-Chris
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Old 20th November 2005, 04:26 PM   #9
sss is offline sss  Israel
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some to-3 trannsistors can dissipate 350W
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Old 20th November 2005, 07:31 PM   #10
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Why do you mean, that paralleling have negative impact in sound, Charles ? Have you some proofs for this statement ?
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