Originally Posted by Old Fart
I wonder if I might simply connect an instrument cable between the "speaker" jack on the VT-22...
Use a speaker cable not an instrument cable when connecting to the speaker or ext speaker jacks.
Use an instrument cable when connecting to the pre amp out or power amp in jacks. The reason why is that the pre out and power in signals are low, less that 0.25 VRMS
. An instrument cable will shield the signal from noise. The output of the power amp to the speakers is in the volts range and has higher currents. You don't need noise shielding but you do need a cable that can handle the elevated voltage and current.
The .25 volts means that it takes .25 VRMS
to drive the power amp to full rated power. The 10K means that the output impedance of the preamp is at least a 10K ohms. This tells me that the VT-22 preamp out will drive the SVT power amp without any issues.
Seems like this is getting complicated. I wonder if I could hook a cabinet up to the VT-22 speaker out (to ensure there is a load, in case a signal tries to get through the VT-22 output section). Then simply run an instrument cable from the VT-22 "Pre Amp Out" to the SVT "Power Amp In."
Yes that would be fine but the VT-22 cab will be working as well. It sounds like you have a later revision so the shorted plug in the power amp in will turn off the power amp sound on the VT-22. Remember, just to be safe, always have a cab connected to both amps when running these tests.
Also, turn the amps off, connect all the cables, then turn the amps on. Plugging a cable into the power amp in can cause a pop which isn't good for the speakers. There is circuit protection in the vintage SVT and STV-VR, but it may or may not be present in an SVT-CL. So follow the precaution just to be safe.