diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Solid State (http://www.diyaudio.com/forums/solid-state/)
-   -   Musical Fidelity P170 Blown Transistors (http://www.diyaudio.com/forums/solid-state/108565-musical-fidelity-p170-blown-transistors.html)

rigel9999 16th September 2007 08:48 AM

Musical Fidelity P170 Blown Transistors
 
Would welcome any suggestions for alternatives for replacing blown Transistors, which are no longer available, in a 1988 Musical Fidelity P170 power amp.

Thanks

AndrewT 16th September 2007 09:00 AM

Hi,
I seem to recall these were Lateral FETs.
Can you confirm type numbers?

PMik 16th September 2007 10:15 AM

The original Hitachi 2SJ81/2SK226 (2SJ82/2SK227) is no where to find and this has been a fact for more than a decade ..., solution use Hitachi 2SJ162/2SK1058 notice these FET's have different housing (TO-3P)

AndrewT 16th September 2007 11:05 AM

Hi Rig,
is Pmik correct?
Are 2sj81/k226 the original fitment?

These are 2bolt Fpack packages.
The To247 Renases replacement are single bolt fixing and should be a straight swap. The Pin order is identical, but you'll need to move them sideways to align with one of the existing tapped fixing holes
2sj161/k1057 are the 140V equivalent.
2sj162/k1058 are the 160V equivalent, these are available from Rapid.

PMik 16th September 2007 11:30 AM

Andrew
Yes they are the original ones
I have had so many of the MF P series in my hands ..., sure i know ;)

ANTHONY2181 16th September 2007 04:19 PM

I have some New 2SK343 and 2SJ99 pairs which look pretty similar in specs + they are the same package.

Regards

Anthony

jaycee 16th September 2007 06:46 PM

Look at the Exicon range of mosfets from Profusion PLC

These are excellent replacements for the Hitachi originals. The ones in the TO-247 packaging should do.

rigel9999 18th September 2007 10:50 PM

Hi Andrew T,

I can confirm the originals are Hitachi 2SJ81/2SK226 (2SJ82/2SK227.

Thank you PMik and everyone else who took time to reply.

Rigel9999

rigel9999 18th September 2007 10:50 PM

Hi PMik,

I still have one set of MOSFETS which are still intact. Should I purchase and replace the one blown pair or do you advise i replace both sets with the Hitachi 2SJ162/2SK1058?

Thank you

PMik 19th September 2007 12:39 AM

I would strongly advice you to change both pairs of MOSFET's to the 2SJ162/2SK1058 this to insure equal performance betwin the chanals ;)

An interesting detail regarding the 2SJ162/2SK1058 is the fact that the pair are equal to the 2SJ50/2SK135 pair
The 2SJ50/2SK135 where used in the MF B200, P140 and P150
Class AB standing current should be set for at least 100mA and imho for best sonic performance 200mA :)


All times are GMT. The time now is 06:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2