Thanks Alexsandr!
I do indeed appreciate your help.
Over the past week I had dilemmas whether to proceed with this project due to lack of MJL21193/MJL21194. Currently, it is virtually impossible to purchase these transistor pairs from reputable supplier - there are just few MJL21193 left whilst lead times for the complementary are prohibitively long. I have also considered using TO-3 MJ variants, but in the recent past I had bad experience with ON-Semi TO-3 devices. Namely, I have more than a dozen of brand new MJ15003/04 which are useless: their hFEs are in two groups differing by much more than 50%. On the other hand, I have almost perfectly matched 2SA1943/2SC5200 pairs, Also NJW3281G/1302G devices match just fine. I will abandon the path involving MJL21193/MJL21194 because I suspect none of them would ever match fine.
As far as I understand, Chalky is also experimenting with "faster" devices due to this problem. I intend to follow his path. Could be fun.
Don't worry Alexsander.
I plan even to make a PSU larger, with more, large, capacitance. Amplidude did the right thing: he uses an array of massive capacitors to provide enough power when needed. Amplifier will take power from it as much as it neededs. In this case more is better. 😉
Of course. I will use also the PSU board, with everything you need integrated: Soft-start and separate speaker protection for both chanels are precious.
Only one thing regarding the PSU worries me: I prefer dual-mono where both sides are separated, except the input grounds. This is the guarantee for easily achieving a totally silent amplifier. That's what we all want: to hear nothing when nothing is at the input.
Hello hschier,
Have you tried a 2sc5200/2sa1943 pairs? Are there any problems with "faster" devices?
I ordered separate power supply boards on the PCB, I used them from the kit for configuration.
For double mono
For double mono
I bought doa33 for login I used bc550c bc560c instead of pn100a pn200a
( will use 2sc3421 2sa1358 instead of mje172_182)
( will use 2sc3421 2sa1358 instead of mje172_182)
Hello Sensation45,
Where have you purchased 2sc3421 2sa1358?
I have purshased INCHANGE 2sc3421 2sa1358 for my previous project from Reichelt (Germany). These were good transistors.
