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I know at least one for sure - Studer A820. I think some other models/makes also used HX-Pro. Cheers Alex

There is a good article about HX-Pro on my site (by its designers Jensen and Pramanik) http://www.ant-audio.co.uk/index.php?cat=post&qry=library Cheers Alex

Happy Birthday Nando!

Here. Cheers Alex

As far as I remember, that resistor adjusts the HF "shelf" in the recording EQ. Unfortunately I don't have time to measure and illustrate it on a graph at the moment. Cheers Alex

It looks like an over-bias if these curves are measured on the deck's own recording. Try to reduce the bias till you get the same level at 10 and 16kHz and than change R95/R96 (use a 20K trimmer) and see what value would give you a flatter overall response. Cheers Alex

1fA = 1E-15A or ~ 6242 electrons/second . A very small electric current value.

12 years ago I've made a file with a fragment of a well known music (direct download link, otherwise the file is listed on the Library page of my website) recorded with +/-2LSB only (RMS level about -91dBFS, ~0.6Mb size) - for checking low level capabilities of various audio DACs. On a decent...

Here is the monitor frequency response of a completely not modified (more accurately, untouched on the electronics side) RS-B965. Cheers Alex

Here it is, working as before. Cheers Alex

Hmm... I've worked with (IIRC) the PDP-11 in about 1984-85 and with some really old valve-based Soviet computers when I was a student. My son has started his computer career at the age of three, playing Captain Comic on a PC XT at my workplace. He graduated in Computer Sciences and now runs his...

Had a bit of a disaster today with one of my workhorse computers, a very old (for a computer, that is) Compaq Presario, serving as the main measuring station, connected to a lot of various bits of measuring equipment with GPIB. This machine is used for measuring my test cassettes, metrology...

With the walkman I was ... fortunate. My father visited Japan in 1986 on an invitation of Masaru Ibuka and brought the WM-R202 back with him. I had to sell it later in a moment of need, and was happy to find one in a good condition a few years ago. Cheers Alex

In the 80th I had own or used (consecutively, not concurrently, I was not that wealthy) quite number of different decks and now I have almost all these in my collection: JVC KD-D10 Technics RS-M253X Technics RS-M263 Akai CS-M02 Sony WM-R202 One which is missing is the Dual 810. I have the 830...

Thank you, for the basic kit - a printed circuit board + related fittings (connectors and a potentiometer, the rest of parts can be bought from Mouser, etc), say £50 (UK Pounds) + delivery at cost (for the US/Europe it would be £25, other countries £30). I can probably offer transistors and...

I've designed the Kora 3T phono stage in 2008 and was making these for a number of years, stopping about 6-7 years ago. The top version - "Limited" was Product of the Year 2009 in its category in Hi-Fi World magazine. The full review is available from my website. I still have a number of PCBs...

My rough estimate would be in the area of $10K. You could ask the manufacturer: https://www.ietlabs.com/voltage-divider.html Cheers Alex

Hmm, a rather interesting question. And the answer is - all the time. Metrology teaches you that there are no total certainty, that you need to pay attention to small things, not normally measurable in a standard "audio" way. That something we usually assume as a linear device in audio, say, a...

Looks like this section was quiet for a while, let's wake it up a bit with some pictures of naked ... things. I have two hobbies, both in the electronics domain, but on two opposing sides of it. One is in audio, where the subjective listening is a king and measurements are only a necessary...

Added another one (and Tim asked me to change his name to his forum handle ;) ) Basics of Cassette Mechanism, JVC Service Guide 1976 (PDF file 14MB) Courtesy of Thinkchronicity Cheers Alex