With a quick mod on one of my active preamps, I managed to implement very quickly the 6Э6П-ДР (6e6p-dr) driver in my system. Here is how the circuit looks like:
6Э6П-ДР (6e6p-dr) preamp / driver
Tag: 4P1L PSE Amplifier
4P1L PSE Amp Finished!
I’ve been travelling a lot lately so haven’t had the chance to update on this project. A couple of weeks ago I finished the 4P1L PSE Amp:
The amp is outstanding, just like previous incarnations and tests I have conducted over the years. The level of detail and tone is unique. This is what I always loved from the 4P1L. I’m running it very hot (70mA per pair) and the output transformer is Amorphous Core 3K2 (more detail to be shared soon). It’s a simple stage with filament bias, so no cathode capacitor. The filaments are wired in series to reduce the heat dissipation. Despite this adds a bit more on the output impedance, the bass is powerful. I’m very surprised with the bass, but the level of treble is amazing. It goes over 40-50kHz, I will still need to undertake the classic measurements but so far is great!
It’s absolutely dead quiet. No traces of hum.
Some more pictures below:
And the full system below:
4P1L PSE Amp: assembling top plates
The additional machined top plates arrived yesterday. I assembled them this morning. Just need to assemble the chassis now before soldering!
HT and LT connectors
Rod Coleman’s boards
Filament resistors
Filament resistors
Speaker posts
Amorphous OPT and plate
4P1L PSE project started
A new amplifier build has begun. The 4P1L PSE is coming to life. First top plate developed and arrived this morning. A succesful layout for being the first one. Need to submit for machining the other 2 panels. It will be modular so I can make changes and experiment with different output transformers I have at hand (Monolith Magnetics, Lundahls, etc.). The HT power supply is ready and I’ve been fitting the filament supplies in child-proof boxes over the Christmas holidays. It will take me some time though to get this one up and running. Not much time to work on it am afraid.