I know that the BP or HP is an old trick on a 2600 but this is very well explained. Thanks for making this. It’s great to have a good quality video maker doing stuff with the 2600.
When I rebuilt the 4019 VCA for my Arp 2600 I gained immense admiration for the clever design of what would ordinarily be thought of as ‘just a VCA’. The two inputs are opposing, and this would be useful in the normalised patch for cancelling out the fundamentals (or whatever comes through the VCF) that would otherwise also occur in the ring modulator output, leaving only the sideband content, if you want. Also, the two CV inputs, one is exponential response the other linear (although I think they’re marked on this device, not on the original ARPs). My original one here (which has ROGER GLOVER stencilled across the outer case) now has a 4019 I built about 4 or 5 years ago using more modern equiv transistors, and it’s all on veroboard (after about five revisions of my replacement I got it down to the same size as the original epoxy block (not that it needed to be that size, but I kept revising the layout as I built further versions of my veroboard 4019 and got it down to that size). It really is a well thought out circuit. (By contrast, the Arp 2700 (ie the Odyssey) is OTA based and consequently a lot simpler, but there weren’t single-chip OTAs back then for the 2600).
Interestingly, the RIGHT channel of the reverb (on the internal patching) is ALSO inverted... I've seen some complain about this, as when running both channels in MONO they cancel out and make no sound (the reverb disappear)... but I figured there must be some clever usages of this as well. Anyhow, to defeat this behavior, if that's what you want, just plug a patch cable from REVERB OUT to RIGHT INPUT, as it seems neither of these patch points are inverted... But then you end up with twice the amplification from the reverb by these being added together (when running both channels MONO). Some things about the design made me wonder, upon getting the 2600... like why the RIGHT and LEFT INPUT patch points would be needed, at first I didn't get it... but considering the above it makes sense, as for mono usage you can have one channel for the reverb and one for dry sound, etc etc... It really is a very cleverly designed machine. When seemingly stumbling upon a CON, you're probably missing something functionality-wise, that actually add further opportunities for sound design...
@@ChromosomeSyndicate I demo'd something like that on a bass patch... if you plug it back into the VCF mixer so its feeding back on itself you can get some really fat and some monstrous growls.
I know that the BP or HP is an old trick on a 2600 but this is very well explained. Thanks for making this. It’s great to have a good quality video maker doing stuff with the 2600.
When I rebuilt the 4019 VCA for my Arp 2600 I gained immense admiration for the clever design of what would ordinarily be thought of as ‘just a VCA’. The two inputs are opposing, and this would be useful in the normalised patch for cancelling out the fundamentals (or whatever comes through the VCF) that would otherwise also occur in the ring modulator output, leaving only the sideband content, if you want. Also, the two CV inputs, one is exponential response the other linear (although I think they’re marked on this device, not on the original ARPs). My original one here (which has ROGER GLOVER stencilled across the outer case) now has a 4019 I built about 4 or 5 years ago using more modern equiv transistors, and it’s all on veroboard (after about five revisions of my replacement I got it down to the same size as the original epoxy block (not that it needed to be that size, but I kept revising the layout as I built further versions of my veroboard 4019 and got it down to that size). It really is a well thought out circuit. (By contrast, the Arp 2700 (ie the Odyssey) is OTA based and consequently a lot simpler, but there weren’t single-chip OTAs back then for the 2600).
Sounds like someone could teach me a thing or two about this.... I wish you where here yesterday when I was completely baffled🤦♂️
Interestingly, the RIGHT channel of the reverb (on the internal patching) is ALSO inverted... I've seen some complain about this, as when running both channels in MONO they cancel out and make no sound (the reverb disappear)... but I figured there must be some clever usages of this as well. Anyhow, to defeat this behavior, if that's what you want, just plug a patch cable from REVERB OUT to RIGHT INPUT, as it seems neither of these patch points are inverted... But then you end up with twice the amplification from the reverb by these being added together (when running both channels MONO).
Some things about the design made me wonder, upon getting the 2600... like why the RIGHT and LEFT INPUT patch points would be needed, at first I didn't get it... but considering the above it makes sense, as for mono usage you can have one channel for the reverb and one for dry sound, etc etc... It really is a very cleverly designed machine. When seemingly stumbling upon a CON, you're probably missing something functionality-wise, that actually add further opportunities for sound design...
Great to see this old technique explained so clearly again... Brilliant!!! Thank you!!!
Than you so much!
All information about this synth is highly appreciated. Keep on the grate work!
Love it! I am new to the 2600 and it is a beast to figure out at first. I had to rewind several times lol Very helpful!
Cheers… I’ve got some more detailed videos on my Patreon site.
Amazing stuff! I keep discovering new stuff about this synth!
Thanks SC, never really understood the VP section if i am honest, except for the lag section. You bought some patch cables too😀.
Using all the same colored cables is really helpful Starsky haha
Just making sure you’re concentrating 😉
i'm not blown away from the 2600 i have him here now 3 weeks and i serious love more my Odyssey .
Shows what a great little synth the Odyssey is.. and why it was so popular originally.
@@StarskyCarr Absolute ! The Odyssey is a extreme good synthesizer with personality .
@@StarskyCarr just patched the filter section out in the preamp and preamp out to vca in and it starts to be in the good direction ;)
@@ChromosomeSyndicate I demo'd something like that on a bass patch... if you plug it back into the VCF mixer so its feeding back on itself you can get some really fat and some monstrous growls.
@@StarskyCarr yes ! this is the sound i was looking for Starsky . i never had a wow feeling from it before .
super job mate
..sounds superb
Is it possible to invert it and make it a notch filter?
Cool !
Do us a favour , would you measure exactly how high is it from table to top of faders. Want to know if it’ll fit.
Its just over 11cm from what I can tell... not too accurate. But 12 cm is enough, 11cm would be a squeeze.. or not possible.
@@StarskyCarr brill, thanks