chiily
PFM Special Builder
Over on DIYAudio Nelson Pass fixed a member's Threshold Stasis amp with a new Front New PCB, re-worked with a few changes. The thread is here https://www.diyaudio.com/forums/pass-labs/363701-stasis-front.html
Nelson then released the PCB as Gerber files for anyone else to build and fix their Stasis amp. As as happens on DIYAudio Zen Mod took the cct, re-laid it out with a couple more tweaks and added Gerbers for a 6 way and 8 way Output stage. The scene was set for a build...
I ordered the PCBs for the original cct, ZM's update and both the 6 and 8 way output stages; 10 of each so feel free to contact me if you fancy a set.
Progress so far...
I've build the FE boards
And the output stages. I went for 6 way in the end. The amp will be driving a pair of ESL57s and I don't need oodles of watts. With that I'm running the boards on about +/-32VDC to keep everything in line with the 57s.
I chose a Modushop 4U, 400mm, Dissipante case with a little milling to the front panel
I drilled and tapped the heatsinks and mounted both output stages and the front ends.
The soft power on module I've chosen has a standby and power led output, so the three holes will be standby LED, toggle switch and power on LED. In fact the soft power on module is another DIYAudio creation. Thread here https://www.diyaudio.com/forums/pow...c-mains-relay-includes-soft-start-h9kpxg.html
On the PSU side I'm trying out a pair of high power Cap-MX boards, again for DIYAudio. This long thread here https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier.html
The drivers will be bolted to the bottom of the amp's case, the heatsinks are there as I'm not 100% sure what the amp's bias is going to be yet - Nelson's line is, "set the bias until the OS heatsink's sit at 50degC after an hour with the lid on."
Again, I have some spare PCBs for both the soft power on and the Cap-MX.
I also decided to use two pairs of active rectifiers because I had the boards and bits
There's another pair lurking in the build box
I'm stuck there atm, waiting for the transformer, 2x25 @ 750VAC to arrive from Airlink; ordered early April and nothing as yet. I've tested the Cap-MX boards and the rectifiers, set the bias pots to maximum...
Exciting to hear this amp when built.
Gosh, the pictures have come out big...oops...
Nelson then released the PCB as Gerber files for anyone else to build and fix their Stasis amp. As as happens on DIYAudio Zen Mod took the cct, re-laid it out with a couple more tweaks and added Gerbers for a 6 way and 8 way Output stage. The scene was set for a build...
I ordered the PCBs for the original cct, ZM's update and both the 6 and 8 way output stages; 10 of each so feel free to contact me if you fancy a set.
Progress so far...
I've build the FE boards
And the output stages. I went for 6 way in the end. The amp will be driving a pair of ESL57s and I don't need oodles of watts. With that I'm running the boards on about +/-32VDC to keep everything in line with the 57s.
I chose a Modushop 4U, 400mm, Dissipante case with a little milling to the front panel
I drilled and tapped the heatsinks and mounted both output stages and the front ends.
The soft power on module I've chosen has a standby and power led output, so the three holes will be standby LED, toggle switch and power on LED. In fact the soft power on module is another DIYAudio creation. Thread here https://www.diyaudio.com/forums/pow...c-mains-relay-includes-soft-start-h9kpxg.html
On the PSU side I'm trying out a pair of high power Cap-MX boards, again for DIYAudio. This long thread here https://www.diyaudio.com/forums/power-supplies/297921-jumas-easy-peasy-capacitance-multiplier.html
The drivers will be bolted to the bottom of the amp's case, the heatsinks are there as I'm not 100% sure what the amp's bias is going to be yet - Nelson's line is, "set the bias until the OS heatsink's sit at 50degC after an hour with the lid on."
Again, I have some spare PCBs for both the soft power on and the Cap-MX.
I also decided to use two pairs of active rectifiers because I had the boards and bits
There's another pair lurking in the build box
I'm stuck there atm, waiting for the transformer, 2x25 @ 750VAC to arrive from Airlink; ordered early April and nothing as yet. I've tested the Cap-MX boards and the rectifiers, set the bias pots to maximum...
Exciting to hear this amp when built.
Gosh, the pictures have come out big...oops...