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Yamaha A-1 transistor 2SC1913 & 2SA913 replacement

S

SamaAudio

New Member
Hello, this is my first post so I will do a quick introduction.

I'm relatively new to the audiophile community. I got into this whole world when my co-worker convinced me to buy his KEF 105.2 II speakers and now here I am.
My main set up is KEF 105 + CA-2010 + SL-5100 TT & Wiim streamer.
My smaller set up uses a NS625 + CR600 + AT120 TT & bluetooth module

I recently got my hands on a cheap A-1 that managed to power up but needed a full recap. In the process I found the transistors on the electrolytic board is fried.
I'm amazed the protection relay was not engaged when I first bought the unit.

So I am looking into replacements for TR133/134 (2SC1913) and TR135/136 (2SA913). I looked through another thread that mentioned MJE15032G /MJE15033G pairing.
However upon research I also found MJE350G and MJE340G that may be suitable. They are both available in Digikey and I was wondering if fellow AKers could recommend a specific pairing.

Appreciate the help and looking forward to getting involved in the community. I will post some pictures of the recap soon.
 
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Thank you. I also looked into the KSC and KSA pairing but like you mentioned they were out of stock.
I think I will order the MJE15032G /MJE15033G to try them out and eventually order the KSC/KSA when it becomes available. Always good to have spares in today's world as more and more of these components become obsolete.

I will start a separate thread of my entire refurb journey. I am close to powering it back up and may need some help once I get things up and running.
 
yes they are no longer available unfortunately... I do see them on eBay at a reasonable cost but I've been informed that many are counterfeits. I do not have a way to effectively test transistors so I am a bit reluctant to take a risk. Ideally all parts would be replaced with the originals but I think that is wishful thinking in 2025.
 
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