The ultimate DIY? A Stax SRM-T2!

[simmconn]

18 hours ago, micon21 said:

  when I bought in 2023 in Digi c2m1000170, they wrote that it was made in China. Now they don't have this model. I made a purchase on Aliexpress, alas, a fake arrived. I tried to make a purchase from another seller on Ali..., and to my surprise, transistors suitable for use arrived. I have already demonstrated photos of three purchases.

You haven’t answered my question how you determined that the part is a fake (other than from the appearance).

[micon21]

4 hours ago, simmconn said:

You haven’t answered my question how you determined that the part is a fake (other than from the appearance).

 I showed three samples, one of the demonstrated ones, the device defines as IGBT.

I assumed that I was not the only one who encountered fakes...

Edited Tuesday at 09:55 PM by micon21

[micon21]

Today I received the main part for T2, the boards. I drew the boards taking into account that changes have occurred in radio components over the past ten years.

 I fit into the dimensions of 300x150mm with power supply units.

[micon21]

 I'm not in the mass production business, so I'm not going to BUY expensive devices, meters, analyzers, for basic hFE determination. Over the last ten years, I've built many different versions of electrostat amplifiers. Yes, not all of them worked. Yes, I didn't like all of them. For example, the mini T2 really disappointed me.

assembled version called carbon, I am happy for two years. But many music lovers always want something better. I hope  that T2 will outplay Carbon. 

Edited Wednesday at 10:42 PM by micon21

[simmconn]

On 7/15/2025 at 2:52 PM, micon21 said:

 I showed three samples, one of the demonstrated ones, the device defines as IGBT.

I assumed that I was not the only one who encountered fakes...

Thanks. I guess nobody likes to receive fake parts. But if it’s a low-current, 1200V or better grade IGBT, its characteristics can come very close to the SiCFET we use in threshold voltage, transconductance and even input/output capacitance. It might actually work, at least in the GRHV. I’d be interested to try it out. Well, we should probably stop talking about SicFET or IGBTin this thread, as they are irrelevant to T2.