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I've discovered that the C2M1000170D is now obsolete and currently out of stock on Mouser as well as several other distributor sites. Has anyone found a good alternative for output transistor for the Carbon? Thanks in advance.

@kevin gilmore Is there any benefit to use DC supply for the front end 6922? The original design was AC and I was thinking if I can further decrease the AC induced noise by using DC supply. If I am going to use DC supply, should I reference LT1083 to GND or using the 47R on amp board will be just fine? Thanks!

🤣 I did look up the folder before asking. Just to make sure I didn't look for the wrong files. Thanks!

What is the name of the tube input for outputbuf2020? Thanks!

Is there any chance doing a tube input version of the pre section?

Why not?

Got the boards. Thanks!

paid

KT77 has different internal configuration. Take JJ's spec sheet for example, 6CA7 pin1 was connected to g3 while KT77 has pin1 NC and g3 connected to cathode internally. It won't be a problem in some versions of the Kevin's layout which G3 and cathode was connected on the PCB. But in a certain version of GG's layout, which G3 was linked to anode. It will be a disaster if KT77 was plugged in. I didn't checked the BH's board layout. So if your BH/GG has former board layout, it should be perfectly fine.

On the 700s page. ●New semiconductor driver with J-FET in the amplification stage All semiconductor driver unit that has adopted custom-made low-noise dual FET at the first stage, and for the first time in STAX driver unit history J-FET has been employed at the second stage. After so many years, Stax finally ran out of the long obsoleted Toshiba JFET. The 700t is more like a change that has to be done eventually. But still for some unknown reasons, they still refused to employ CCS in their tube amps. And the second of the 700s stage is quite interesting for me. It's so sad that it hasn't been a lot of innovations since the old Stax gone broke, so minor changes now become news.

They claimed the 700s has JFET VAS stage. Any opinion?

It was quite hot in this size with that current of my build. Is your amp running hot too?

It was a small batch made customized. The factory did everything for me. ps. I have some spare.

Time for some old fashioned design. You can't go wrong with through hole.

I want to add 2x GRHVxxx 1x GRLV79xx 1x GRLV78xx 1x Main Board 1x miniT2 in total: 6x GRHVxxx 3x GRLV79xx 3x GRLV78xx 3x Main Board 3x miniT2 Thanks!!