It was easy to try.
At some point both electron tubes were wired on the Pleiades V6 breadboard jig for quick comparisons. The power supply for everything is 3 AA 1.2V batteries. A fuse must be used in series for safety.
At some point heater were connected in parallel. So the sound was the sum of the 2 tubes.
As the Nuvistor entered the circuit the anode current of the EF183 started falling possibly due to the heater voltage drop though the series adjusting resistor.
The sum of the anode currents were 50μA. It could be confirmed that both electron tubes operated by gently finger tapping them and distiguishing the microphonics. The 7586 is with flying leads to its base. Very low and interesting microphonic sound. High pitched only.
The sound quality was interesting as having the sum of the sound qualities of both tubes.
It can be easy to switch on or off multiple tubes or combinations by just selecting to which the heater voltage is applied.
Disadvantage is that all electrodes and therefore cold capacitances are in parallel too.
Other way is to have many tube sockets wired in parallel. And then plug in an ECC82, EF183 to a different socket, an 7586, a 6SK7 to an octal base etc. any combination possible.
Having said that since an 7586 sounds too nice and cosumes low heater current may be the one used in the hardwired Pleiades V6 octagon orange box.
Signal path, setup:
Grampian DP4/L - Pleiades V6 - Sony TC-D5 pro - Sennheiser HD580
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