50 minutes ago, Pars said:

I don't see any marking at all on the center 2 devices, and that is zooming in a bunch. I would find them suspicious. I do know of a user on diyaudio selling genuine at reasonable prices. I bought some 2SJ77/2SK214 from him and will try to post pics of those.

Thanks for your reply, Pars.

The photo angle isn’t ideal. In real, at a certain angle under light, I can barely make out the 2SK216 / 2SJ79 markings, but they are extremely faint. I’ve seen genuine Hitachi versions before and they look quite different. I’m not sure if Renesas production ever looked like this, but I personally haven’t seen any sands with markings this faint.

Below is a comparison. On one side is what I believe to be a normal 2SK216, and next to it is the suspicious 2SJ79. This T2 actually has a mix of both types of markings installed.

Edited April 7Apr 7 by Shawn
Photo updated

Here's a pic of what the guy on diyaudio has. This looks like the one on the bottom of your pic. The only way to know for sure would be to pull them and test them, but I'm not sure how to best do that.

 

Here is a link to the fs thread, and this guy is trustworthy. In Europe, but shipping hasn't been too bad not has delivery time.

Edited April 7Apr 7 by Pars

On 4/5/2026 at 6:10 PM, Shawn said:

I’m currently helping repair a DIY T2, and while inspecting the amplifier section, I came across something a bit suspicious.

The 2SJ79 / 2SK216 devices look like this (see attached photos). The marking on them appears very faint and somewhat unusual: not what I would normally expect from these parts.

This makes me suspect that they might be counterfeit or at least not from a reliable source.

Has anyone here seen this kind of marking before on genuine 2SJ79 / 2SK216?
Any insight would be greatly appreciated.

 

Those look like Renesas parts, which have very faint and hard to see printing. 

On 4/7/2026 at 5:10 AM, Pars said:

Here's a pic of what the guy on diyaudio has. This looks like the one on the bottom of your pic. The only way to know for sure would be to pull them and test them, but I'm not sure how to best do that.

 

Here is a link to the fs thread, and this guy is trustworthy. In Europe, but shipping hasn't been too bad not has delivery time.

Pars  Thanks for the link to RM. I’ve been registered there for a long time, but I didn’t know they were selling the 216. I bought the 216 and 79 on eBay in 2020. I was building a T2 in 2024. But the board didn’t work. Most likely, the 216 and 79 weren’t original. Replacing them with TA004 didn’t help. When RM sends me the old 216 and 79, I’ll try to get this model running again.  Right now, I’m happy with the modified version. The boards are from KGSSHV Carbon, but I replaced the C2M1001700 with EL34 tubes.

Edited June 10Jun 10 by micon21