Yes.I suppose the operator relies primarily on those two controls to achieve both the right amount of compression as well as the appropriate output level
What situation would that be ? Tube failure ?Transistors have maximum emitter - base voltage usually around 5V. Connecting the sidechain board outputs together might lead to a situation where the emitter - base max voltage is exceeded.
It can happen just in regular use if the BD139 emitters are connected together.What situation would that be ? Tube failure ?
Initial idea was to link for stereo after the BD139 SC output transistors (not a good idea for above reason). Nonetheless, I have been running/testing this cautiously for some time, always wary of course that I might end up blowing things up -- but I also have to say that generally I like dual mono more.
Well I know he told me he was having trouble logging in and asked me to post here to let others know how to contact him so there's that.I think he asked for his account to be disabled - he'll just have to contact admin to get it re-opened
Cool. It wasn't really meant to be a poll...lolI don't think admin should press him about re-opening it..
(14 Feb 2023, 10:10 pm)
In order to protect the SC out transistors from damage when simply hooking them together for stereo, would adding a diode in series after the transistor on each channel and then linking for stereo after those two diodes do the trick of protecting the transistors from possible damage should there be CV (can be high up to 12VDC, I think) only coming from one channel? SC control voltages would need to be upped a tiny bit to overcome the diode step.
If not this, I'll rewire SC for input from L&R but only one set of controls.
(14 Feb 2023, 10:44 pm)
Adding a diode will work but you also need to add a resistor from the BD139 emitter to ground (sidechain board V0). The resistor value doesn't matter that much, 10k for example will work.
[schematics see attachment]
(14 Feb 2023, 10:51 pm)
10k there to keep the BD139 happy ?
Replacing 1R. Good idea. I don't like dangling components.
(14 Feb 2023, 11:05 pm)
I think the resistor needs to be there because the diode alone will basically leave the emitter floating when the other sidechain has higher output voltage.
(15 Feb 2023, 1:26 pm)
I installed two UF4007 and the two 10k (used 2W ones cos of thicker lead)... and it works Will test a bit more, but confident... so basically unit is now queuing up for (re-)calibration.
Thank you very much (yet) again.