near +-57vdc rails for the NCC300 (for the output stages). A 3rd set of secondaries which will allow a separate +-63vdc railed PSU for the front end reged down to +-45vdc.
In my Voyagers (VBE+QUDOS), I'm pretty sure my VBE input voltage was higher than the QUDOS' output voltage. (The VBE regulates it down to match the output voltage, which is what the QUDOS requires.) I may be mistaken, but I thought the NCC300 was sort of a VBE+QUDOS combo. Therefore, I was surprised when I noticed your front-end voltage (±45VDC) was lower than your power-amp voltage (±57VDC). What am I missing here?!?
I'm quite keen to understand your amp, as I'm hoping to build a dual-mono 300 similar to that. I have two ±40VAC Plitron transformers waiting in the wings, which are going to be used for the two output stages. They don't have additional secondaries, though, so I have to by a third transformer for the input side. Given your message, I'm rather confused about the required output voltage.
Also, I'm wondering whether I can use a single transformer and CAP6 to power the input stages of both NCC300 boards (given their lower power requirements), or whether I need separate supplies.
And I'm concerned that I'm running out of space!!! I've got a
Modushop Dissipante case, which has an internal space 120mm high, 360mm wide, and 400mm deep. I have lots of stuff to fit inside:
- 2 x 500VA Plitron transformers
- 1 smaller transformer for front-end (possibly with dual-secondaries)
- 2 x Hacker-Caps for the output stages
- Either a single CAP6 for the input stages of both boards, or two separate Hacker-Caps
- Speaker protection module, and yet another 12VAC transformer
- Avondale SSM2
I suspect that case won't be big enough, so I may have to go for two mono amps. I've got two spare
Pesante cases, that I could use for that, although I would have to change the bottom panels to 4mm aluminum for heat dissipation. (I screwed myself once with that, so I definitely won't make that mistake again.) I would also have to get more SSM2 modules, etc. One nice thing, though: it would mean they would fit in my Mana racks. That 3U case would have to sit somewhere else.
Thanks for any insight that you can provide.