Ariamella

Gotcha, thank you very much! Do you mean opposing transistors as in complimentary transistors? Google wasn't very helpful in that regard... Reading through the thread is a little overwhelming x)

Ah sorry, I mean, which transistors should I match? Is it all of them?

Apologies, this is probably a silly question, but what's the most important components to match? (And for the GRLV too...) I'm still a little new to this side of DIYing...

Also, is matching a must for this amplifier?

Ah, am I blind or is there not actually a 10k on the silk?

Your BOM has 1k specified but I can't find that anywhere in the schematic. Is the 1k necessary? Edit: here's the mouser BoMs for the CFA2 and GRLV I created: CFA2 GRLV (30v) I think they're both correct but if there are any mistakes please let me know...

Alright, I'll think I'll use a 100VA traffo and keep it at 35V for 10uF and 25V for 47uF for the tants then. Thank you for the help!

Holy crap, it takes that much power?

Thanks my dude. Also, I'm aware that 28-30vac is a good range for the traffo for 30vdc but if I want to power a CFA2, what va is recommended?

Apart from the big caps (using 50v ones) and r8/r9 to 3kR, do I need to change any other parts assuming a 30v output? I assume the tants too, but would 50v for the 10uF and 35 for the 47uF ones be fine?

Ok, thank you very much! Would wirewound trimpots be ok to use instead of the cermet ones specified? Happen to have some lying around.

Do the other specs of the LED matter or is it only the forward voltage (1.7V) that is important?

I'm pretty certain they don't but I want to ask just in case!

This is the hFE chart on the datasheet of the KSA992 (and should be identical to the grading system on the KSC1845). @kevin gilmore, do the 2SA1145/2SC2705 on the ss dynahi boards I have need to be matched?

What grade are they? I'd love some if you can spare them!

They appear to be discontinued, sadly enough. Urg getting through-hole sand is incredibly difficult it seems...

Do you have any other suggestions for 2SA1145/2SC2705 replacements? EDIT: Just checked the pin outs for everything else and they're a match!

I was wondering about the transistors used on one of the older versions of the susy dynahi boards being obsolete, and after searching online I think I've found replacements for all of them that seem to be drop in. I'm just wondering if these are fine or if I need to find something else or try and source NOS or used parts. 2SA1358/2SC3421: KSA1220AYS/KSC2690AYS 2SA1145/2SC2705: MMBT5551/MMBT5401LT1G 2SA1349/2SC3381: matched pairs of KSA992/KSC1845 Matched pairs of 2SJ74/2SK170: matched pairs of LSJ689/LSK489 or LSK74/LSJ170 (both seem to be rare/expensive!!)

Ok, thank you anyways! The older revisions are probably close enough that the case I plan to use can fit them all...

Thank you very much! Is that the newest SMT version of the dynahi? Sorry to be a bother but do you happen to know what the dimensions are for the V1 Susy Dynahi boards are?

Maybe I'm blind...but I can't seem to find the dimensions for the offboard ss dynahi PCB. Does anyone happen to know them? EDIT: And maybe the GRLV too. I'm currently doing a layout plan on google sketchup so it would help to have those dimensions handy!

Hm that could work at some point, but I doubt I'd be able to afford both of them at the moment...:p

Yeah, that's what I figured. 30VAC it is!

Ok, crunch time, time to decide which PSU to use! I've settled for either the GRLV or the Salas SSLV1.1/BIB. Both of them seem to cost about the same amount of money to make, so I'm having difficulty deciding which one to go for...

Alright, thank you. Thinking of something like these: https://airlinktransformers.com/product/chassis-mounting-toroidal-transformer-standard-range-cm0030230 https://www.ebay.co.uk/itm/220V-30W-R-Core-Transformer-for-Audio-AMP-Amplifier-Preamps-DAC-CD-30V-30V/232178765651