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Accuphase E202 2SC1451 replacement

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wondoka

New Member
The E202 came to me with one weak power transistor so all got replaced with new MJ21193/4. Was fun to match them with an Atlas and vintage ELV TT7000 tester.

Once in I replaced overheated resistors, out of spec small value capacitors and several 2SC1451 on the Power Supply pcb with KSC2690A as they match the requirements and were available in my parts box.
And more 2SC1451 got replaced: Phono Equalizer Q9 & 10 as well as on both Main Drive pcb Q3 the KSC2690A were used, too.

Now I’m wondering if KSC2690A are the best choice for Phono and Main Drive pcb’s. A good alternative could be TTC004B as it has lower Cob (and is for audio ;) ).
Any experience you could share how to best care about 2SC1451 on Phono and Main Drive pcb?
 
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I used KSC3503DSTU in all boards.
sanjib

Thread 'Accuphase E-202 Restoration'

This Accuphase E-202 came to me is in the protection mode when powered on. With the right amp board removed came out of protection. Check the pre-amp section separately, one channel is good but the other one had considerable distortion.
After checking the right amp I found the culprit was the differential pair. Replacing those solved the problem and for the preamp, a good cleaning of switches brings both channels into working condition.

I found someone in there before me and replaced one main filter capacitor, one resistor in the power supply.
Now it is ready for restoration.
First is the...
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True - but what would be the suitable replacement for the 2SC1451 from trusted sources like e.g. Mouser?
Thank you.
 
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