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CCS PCB Ready
I received the first batch of PCBs after several tweaks during the prototype phase. I’m very pleased with the result: I built several boards to test the various combinations that this flexible CCS...
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NP Acoustic Transformers
This is a long overdue post which I never had the time to write about. I was hoping to get my measurement gear down to where my system is to take a final FR sweep analysis of my 4P1L PSE amplifier, but...
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01a Preamp ready for ETF
Had to redo the top plate when new frame arrived (arghhh). Here it’s the new Preamp just rebuilt Very close but now ready for ETF in a few weeks Frame is made out of walnut root. A great job by...
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ETF.18 DHT Preamps Lecture
ETF.18 has been an emotional journey. I moved house literarily when I got back from ETF so my life has been more than hectic over the past few weeks. I promise I will do a write-up of this amazing...
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Hybrid Mu-follower (aka Gyrator) Rev08 PCB Update
It’s been far too long since I last posted on this blog. With the limited spare time I’ve got these days, I concentrated in setting up the new workshop and system since we moved back to our place. I’m...
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New listening room
The new listening room (at least for some time) is now ready. One of the loft rooms is now purposed for guests and for music. Everything is set up. The 4P1L PSE with Monolith Magnetics S9 OPTs, the...
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Bootstrapped CF (SLCF) PCB tests
Long time ago I used this SLCF circuit as an output buffer with excellent results. It sounds as clean as it can get in my opinion. Recently, I made up a PCB to hold this circuit with a varied of...
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45 Push-Pull Amplifier
Chasing that sound The 45 DHT is probably one of the best sounding valves out there. In fact, I have struggled to get a similar level of detail and timbre in a 300B or 4P1L output stage. Even my 814 SE...
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Pentode Differential Pair (Hybrid Mu-follower)
Pentode drivers are very interesting. You can get excellent results out of them. Here is my version of a differential pair using pentodes. I want to try them out in the 45 PP design I wrote previously...
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300B Emission Labs
Back at the beginning of the year I purchased a pair of Emission Labs 300B for my new amplifier version (still working on it). I own several 300Bs but was keen to try these out given their reputation....
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Tail CCS PCB test
A belated test of this simple, yet effective PCB. I made it as small as possible, however in order to provide flexible connections, it’s actually double the size. Still at 4 x 4 cm is small enough. You...
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47 Push-Pull with local feedback
This design is inspired on the great work from Gary Pimm. The 47 is a sterling directly heated pentode and worth using it. I have several on my stash, including some good globe versions. The following...
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45 SE Amplifier – revisited
A unique sound If you have a small room and high-efficiency speakers, then keep reading. If not, you can still enjoy reading about probably the best sounding output valve in my view. The 45. I wrote...
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EML20A driving EML45B
I’ve got asked the question on how an EML20 (or EML30) can drive an EML45B. Answer is straight forward and hopefully this brief blog entry can shed some light to this request. I recently looked back...
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D3a driver w/ Rev08 board
A friend from Canada ordered a pair of boards and I used the opportunity to test the newly arrived hybrid mu-follower (aka as gyrator) Rev08 PCBs. He will be using these boards in the 300B design...
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6F12P a great Russian valve
The 6F12P is used (by many) in Europe (mainly) in RIAA circuit. You would wonder why? Well, it’s a great Russian frame-pentode which has high-mu and high-gm therefore driving larger currents at low...
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Iron and Sand
Over the last few months life has been very hectic for me. Between work travel and family, I’ve struggled to find time to work on any audio related stuff. You probably noticed this as have reduced...
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