The Pinnacle is a 2-stage SE amp, using 6SN7 with LED bias as the first stage, capacitor-coupled (copper foil PIO) to the PX4, which uses conventional cathode bias (run at fairly low current and voltage) as the second stage. Transformer coupled input and outputs, with switches (inputs) and relays (outputs) to control balanced and unbalanced connections. Relays are used to switch the audio path, so the signal path is direct.
The HV power supply is SiC shottky rectified, RCRC filtered in the power supply box and another LC in the amp box. Isolated supplies are used for the two PX4 filaments, which use a somewhat complex combination of CCS in the PS box, and CM filtering and finally shunt regulation in the amp box. Another seperate regulated supply generates the 6.3V for the 6SN7 and 5V to supply the LEDs and relays.
Two delay circuits sequence the B+ and output mute relays. There are also protection circuits to prevent HV from being applied to the outputs, and also to kill any HV on the umbilical cable if either end is unplugged. (I've been designing equipment for almost 30 years (!) so I understand the regulatory safety requirements).
Hopefully that answers some questions - that's about as much detail as I think I should give!
And it's certainly more than you had to. Once again, thanks for being such a great contributor to the community. Anyone who is complaining should just not buy this and stop saying its overpriced. It's priced just fine for what it is. Todd and Pete have no history of price gouging and seem to be very fair and open.
If you don't like the price, don't buy the product. I won't, and I'll probably never be able to afford this, but Pete and Todd are keeping headphone Hi-Fi alive.
I can't believe how many people are coming after these guys for price when Todd is one of the best guys in the industry and Pete puts hundreds of hours into designing amplifiers that can be built by anyone with zero personal gain.
Edited by revolink24 - 12/14/10 at 12:18pm