My 30 seconds of googling says it’s an “inaudible pulse”. If that suggests it’s just a rising or falling edge of a single pulse I can’t imagine it’d be hard to make useful. How useful is probably debatable though.
My googling suggests that it’s using track 4 of a quarter-track tape (what would be the left channel when you turn the reels over).
So that suggests either a 4-track record/playback head or an additional head in one of those replaceable head-blocks.
Perhaps there’s some way to reach that signal in addition to the two tracks of audio?
@TimMJN: any clue on your new toys?
Im still awaiting the required DIN connectors to try them out. I’ll report back when I did! Got both the 2 track and 4 track head assemblies, so I should be able to figure it out.
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Looking for something completely different, I might have accidently unearthed more about UHER Dia-Pilot…
Page 10 of https://www.worldradiohistory.com/Archive-Amateur-Tape-Recorder/ATR-1967-3.pdf describes a much earlier accessory which sits adjacent to a tape recorder rather than being built into the unit, so it might or might not work the same way, but it records 100Hz pulses on track 4 as guessed above.
And have a look how it generates that sync signal: “The 100Hz signal for recording the pulses is picked up from across a 150 ohm [resistor] connected in series with the ac side of the bridge rectifier”.
Keep your fingers out @TimMJN!
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Oh wow, that seems a rather un-German way of doing it 
Look what came in today! (The EMU Xtreme Lead-1)
Appropriately yellow for the cheese factor, but we know it’s capable of more than that!
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my new LMNC-bag arrived today. nice and thick fabric, almos feels like denim. I love the glossy logo. it is a little bit smaller than the previous itteration.
and don’t forget to order yourself one of the new green shirts, I picked one up on the last tour.
support your heroes!
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That bag is totes great.
XD
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Cool. Though at first glance I saw LMNC lederhosen!
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A not exactly musical arrival: a Sinclair SC110 portable oscilloscope
Sinclair Radionics of Cambridge UK, famous for calculators and early home computers, also made a successful range of bench instruments in the 1970s.
That display is a tiny CRT (cathode-ray tube) so there is 700V lurking inside a little battery-powered box.
It’s playing nicely with one of its step-siblings, a Thandar TG102 function generator.
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It’s rare, but it’s nice to know I can still foster extreme jealousy, you jammy bu66er!
Great catch!
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Now i suddenly want to build the 1.3’ OLED oscilloscope kit lurking in my cupboard and find some blue lighting gel.
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Brilliant, two results: jealousy and inspiration!
“not exactly musical”
…that’s what we do here
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BNC to RCA cable
I like these for patching proper kit (oscilloscope, signal generator etc) to random things (synthesizers, tape recorders).
1m long, BNC plug one end, RCA (phono) plug the other end to fit a collection of RCA adaptors: BNC again, 1/4" jack, 3.5mm jack.
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SynthCube had a sale… 2 mega percussive synths, 2 kassutronics slopes, 1 barton 4 quadrant multiplier, and 1 barton attenuverting mixer. If all goes according to plan, this will fill the remaining spaces in my case.
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Just arrived from a pal. It came with one request, “make this playable.”
Looks fun, but playable might be a stretch. Looking for a schematic but not holding out much hope.
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Got these in a trade from @krztoff . Looking forward to building them!
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I made a deal with @theSamFiles in the BST thread and today the modules arrived. The CAT module is the first colored pcb i met in person… NICE!
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