Friday, February 06, 2015


The SS30 appears here in a list of the the top 25 vintage synth.

The Electricity Club is an electro-pop site and features many artists who have used the SS30.

"A site that dares to mention LADY GAGA, LITTLE BOOTS, OMD, NEW ORDER and KRAFTWERK in the same breath? A site that likes to talk about the best of the new sounds that are emerging in an invigorated music scene? A site that prefers not to employ phrases such as “80s”?"

Tuesday, February 03, 2015


It looks like my deadline of August 2015 will have to be revised.

Firstly there are some nice things happening in my life which will be taking up a lot of time. 

Secondly I've become involved in making some music for a film project (nothing with a budget, but it will get seen). I don't know if it will come off yet but I never want the SS30-M to get in the way of doing some actual music. And music with a deadline is perfect for me as it will get done. It's a shame I won't be able to use the SS30, but maybe a virtual one could stand in.

Just before Christmas I started work on a temporary front-panel. I'll post more about that later though.

Monday, December 15, 2014

Sound generation - SS30 Lives! Part 2

On Friday night I made some more wiring fixes and played around with the pitch, detune and vibrato controls.


More on the oscillators and pitch control later.

Wednesday, December 10, 2014

Sound generation - SS30 Lives!

Last night I proved that all the key switches on the K boards are working and that G boards are generating tones on all of those notes. In fact I got some sound out of the SS30!

I had to fix one wire on K2 

Then I hooked the scope to the keying circuit of C2, the first note on K1 and the 8L output of G1. 

The voltage on the key circuit rose when I connected it to earth (-7V up to 0V) and then fell back gradually when I disconnected it, showing that the sustain was working well. 

The output from the generator showed something like what I was expecting, although not exactly. It seemed to have a lot more going on that I was led to believe that it would by the circuit diagrams. It looked like a mix of notes.

G1 8U output

I tried the rest of the keys and got the same result. So far so good.

Then I moved to K2 and G2. I got the same result but this time it was unexpected. The G2 8L output should only have C#3 to F#3. On G2 the octaves are divided as part of the keyboard split option. So, keys on the upper half of the octave should not be generating output on the lower half of the generator board. 
G2 Outputs

My assumption had been that I would need to check each output from the G boards. This was my thinking because not only do the same key switches drive both the 8' and 16' outputs on each board, but also those outputs then get routed and mixed together in different combinations. Even if I got something audible at the final output for every key there might still be some missing components to the sound. 
I also assumed that because the switching controls, such as keyboard split and the mixing switches were disconnected there wouldn't be any signal making it's way to the output. 

Now that I am seeing what appears to be a mixed signal at every output I needed to check more carefully.

However rather than do that I decided instead to cut to the chase and see if there was any sound coming from the main output. And there was! 

Every key produced a tone and I could play more than one at once (no reason why it shouldn't, but.. y'know, it was nice to confirm). It sounded awful though. Partly because I just grabbed my Korg Monotron and used that as the amplifier. Also, I suspect there is a lot of noise being generated by the number of loose wires and the proximity of the audio output cabling to the power supply. However after looking at the circuit diagrams again I'm convinced that no sound should be reaching the output at all! With no keyboard split switch connected the bottom two G boards outputs should go nowhere and none of the outputs should get through if the mixing switches (Cello 1, Cello 2, Viola, Vioin 1, Violin 2) are disconnected. I can only guess that what I heard was somehow leaking through. All electrical signals create electro-magnetic radiation which can be picked up in wires, so it's possible.  I've seen stranger things happen. 

My next step will be to methodically trace the signals from the G boards through the circuit. Hopefully I will work out where the signal is getting through as expected and is not getting through .  I will also try reconnecting the switches to see if I can get some more consistent behaviour.


Friday, December 05, 2014

Owners Manual and other scans

After finding the Yamaha IC guide on the Internet Archive, mentioned here tone generation, I started to think I should share the owners manual and service manual. Actually, I was thinking it would be useful for me to have scans of them anyway. And of course if I was gong to share them they would need to be in pdf format. However, one of the things that irks me about .pdfs is when there are no links or searchable text in them. Most (all) synth manuals I've ever downloaded are just plain scans of the original printed documents and no active content. Fair enough, but I wanted to do better. So, I embarked on the task of creating scans and converting them to .pdf using Acrobat.

There are actually four documents

Owners Manual - User guide, in other words. "STRINGS SS-30 is a keyed instrument to let you enjoy rich tones peculiar to the strings with this instrument."

Service Manual - The circuit and wiring diagrams. This is, obviously, the really useful bit for the project.

Parts List - Including spectacular exploded 3D diagram

 Block Diagram & Overall Circuit Diagram - No scans yet.

 The service manual folder also contains the parts list and the block diagrams, which are printed on either side of a huge poster sized piece of paper.  I've scanned everything apart from that as I was having problems with the scanner I was using and wanted get on with the rest. It will need stitching together.

I made a start on the service manual and I'm about 80% done.

Work in progress

 It's been a huge job to add all the text though and I got tired of it and decided to knock off the owners manual quickly to show some progress.

So, here it is!

In the pdf all of the text is searchable, the contents section contains links to the relevant pages and the 'How To Use SS30' section has links for the numbered references on the diagram.

Wednesday, November 26, 2014

Benge Studios' SS30

From the It's Full Of Stars blog

Ben 'Benge' Edwards seems to write this blog, although he goes by the handle Zagoba for blogging purposes. It's all about his studio and anything that interests him really. The whole darn thing is a dream for anyone who loves synths and recording technology. He's a lucky devil!

This is a nice little SS30 demo he put up. 

Tuesday, November 11, 2014

I Dream Of Wires

A great film and well worth watching even if you're determined not to get sucked into that whole different mess of wires.

Also a Garry Numan song and a made up (by the NME) band.

Anyway, as I may have pointed out once or twice there are a lot wires in the SS30. A lot.

I've had a couple of sessions since the G boards were brought back to life just rewiring the K boards.

First off, two of the G boards where disconnected from their corresponding K boards.

Lots of old, seventies solder. 

Finding a good method for stripping wires as thin as these can be a case of trial and error. Luckily I quickly hit upon using these tweezers to just yank the plastic sheath off.

Strip and twist, strip and twist.
Note the wires are tied with fine string dressing.

Ready to solder

And on the other side, another 49 wires from the K boards to the key switches.

The muck was there when we bought it. Also you can see more loose wires to be reconnected. That yellow one should be attached to AT1.

I had cut all the wires from the key switch PCBs on the assumption I wouldn't need them again. It was also to make handling the whole tangle of boards and wires less difficult. Now I decided to reattach them temporarily to make it easier to test things out.

I removed the switches as they were in a bad way.

And the finished job. A keyboard (if your fingers are earthed).