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Gyrator load – test mule
I’ve done several tests using a simple gyrator PCB test mule. It was time to build a proper and flexible test mule for extreme abuse: 2 Boards for current flexibility Board 1: BF862 Board 2: J310 Top...
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Abusing the Gyrator Load
On my previous post, I covered my initial build work on the gyrator test mule using the gyrator PCB. I did all the lovely soldering work (which I do enjoy not like milling or drilling) and proceeded to...
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27/56 Preamp from Jose Martins
Jose Martins sent me an email with his recent built on the 27/56 preamplifier using the gyrator load and these PCBs. I recently posted an idea using the lovely 27 IHT valve here. Here is a picture of...
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Tony’s 01a Preamp
I went to see my friend Tony today and helped him to fix his 01a preamp implementation. Time ago Tony used a prototype version of my gyrator PCB to build the Gen2 preamp with the addition of an output...
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Building gyrator boards
I’ve been on some business travel so haven’t had much time to work on stuff, however I did get a set of gyrator boards for a friend and a customer: BF862 configured for 4P1L preamp 2SK170 configured...
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SiC MOSFET Follower Driver
How many more times Led Zeppelin wrote a fantastic song on their first album: how many more times. You may not be a rock fan, but hey: what a great song. How many more times do I want to get back to...
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UV4 PTFE sockets
Looking to build a new 01a Gen2 preamp shortly. This time will be for the rare UV-201a valves. They need a special socket UV4 rather than the usual UX4. See width difference of both filament pins. In...
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Running
A common theme of our age, run. We keep running, but not physically only. Our minds are constantly interrupted, like an CPU IO interrupt. Well, sort of. You get the gist. We run from home to work, from...
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SMD soldering for gyrator PCB
I have a new microscope for SMD soldering. If you want your gyrator PCB with a presoldered BF862, now it’s possible!
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JFET Buffer
Fall 2016 End of summer is here, and for some the beginning of the building season. Well, not for me am afraid. My parental duties and work are keeping me very busy these days. I don’t have the free...
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01a Preamp Build: UV-201a version – layout
Just playing with the layout a bit. The gyrator boards, the UV4 sockets and the Rod Coleman regulators. All in a tiny aluminium box:
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01a Preamp Build: UV-201a version – step 1
This is what I managed to do with a couple of hours at the workshop. Time is gold for me these days. Quick drilling and fitting the main components. You can’t get a smaller preamp than this one. It’s...
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The world has gone mad
Just a quote from a friend who inspired the cartoon below “With all that is happening in the world, I’m just liking being able to come home and put a record on. There’s something honest about it”. –...
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Led Zeppelin – the complete BBC sessions
I usually don’t write about music, mainly because this blog isn’t about my music preference and I respect that people may have different tastes. Either way, I couldnt’ resist in posting about this...
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6Э5П Shunt Cascode Driver
Introduction The main challenge when implementing valve amplifiers using transmitting valves or valves which require a significant voltage swing (e.g. 300B, 45, etc.) is the driver. Getting the driver...
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Headphone Parafeed Amp – Part I
Introduction Did you ever dream about having a nice valve headphone amp? I did. Several times in fact. I’m not keen on the OTL designs and yet, owning a pair of Grado’s SR80i 32Ω headphones, I’ve been...
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