All about electronic valves and hi-fi
Firstly, my apologies to all readers for not writing much over the last year. Things have gone a bit crazy between work and family commitments. Also, modular synthesiser work has taken a lot of interest lately to me. Finally, this blog was hacked twice and have been painful to get it back up again. Needless … Continue reading “4P1L PSE Amplifier for Sale!”
It was mentioned here, so I decided to chip in with my previous experience from back in 2013. Here is what I tried myself:
Last time I wrote about the 4P1L in screen mode. It was great to see some DIYAudio member (Blitz) to post about his work on the 4P1L with screen as anode. I call it screen mode but probably is incorrect. His post about G3 structure remind me to post this, I have tested it but … Continue reading “4P1L / 4П1Л Siberian Gen4 in Screen mode (part 2)”
Some time ago, I did some initial experiments with the 4P1L (4П1Л) with the screen performing as anode instead. Some DIYers claim the improved sound of the mesh type anodes. Kees Brakenhoff kindly sent me some PL519 to test in screen mode. He has done multiple builds with this mode of operation with great results. Unfortunately … Continue reading “4P1L / 4П1Л Siberian Gen4 in Screen mode”
The return of the Siberian After trying out so many DHTs and pre-amplifiers, I decided to wire up my 4P1L preamplifier Gen3 and fit the gyrator board to drive my 4P1L PSE Amplifier. I have a pair of 4P1L/4П1Л dated 1968 which are properly burnt in. I’ve used them lately in my previous preamp incarnation … Continue reading “4P1L (4П1Л) Siberian Gen4 – DHT Preamplifier”
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 … Continue reading “4P1L PSE Amp Finished!”
The additional machined top plates arrived yesterday. I assembled them this morning. Just need to assemble the chassis now before soldering!
Background I’m a firm believer than sharing knowledge and experience is the best way forward to continue learning yourself. It always pay pack at some point. This time Paul Prinz, a fellow implementer of the 3B7 DHT Preamp using the gyrator PCB, came back with a great suggestion. He found a MOSFET which could do … Continue reading “4P1L: pump up the current!”
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 … Continue reading “4P1L PSE project started”
Well, ok. You want more power from previous 4P1L PSE amp? Here is an alternative approach: You can get 5W at 2% THD maximum. I’d rather avoid filament bias at the output stage and instead apply fixed bias and a source follower driving the 4P1L stage. Best performance, lower THD at high output power. However, … Continue reading “2P29L/4P1L PSE Amp”