Dreaming of connecting a Jensen transformer on the Pleiades V6?

It was realized half awake half asleep that a Nuvistor electron tube would also work at 4V.


It looks very obvious but this idea had never come when fully awake.


Same last night-morning. The idea of using a conventional high quality transformer such as Jensen hardwired came.


A 1:10 Jensen JT-115K-E is available so why not. In the datasheet they claim to be the Worlds finest audio transformers. This is a bold statement. They should know. They also have a very helpful explanation on their website of the pin 1 problem. The connection of pin 1 in the schematic below comes from their passing of knowlege. Pin 1 is just connected to the left terminal on the Neutrik socket. So effectively pin 1 is connected to the metal enclosure.


Also trying to make life easier, an old box with electron tube socket and Neutrik XLR input and output sockets is already available. It was from an old (pre 2000?) experiment including an interstage transformer and a double triode. It never quite worked at 12V. Pleiades bias was possibly not known at the time. With Pleiades bias it is very easy for an electron tube to operate beautifully with possibly lowest noise at even 4 volts for both heaters and anode. On the Pleiades V6 schematic below the transformer secondary grid coupling capacitor is usually 22nF. The Pleiades bias resistor is usually 6MΩ. it works well with the Nuvistor 7586 electron tube too. Maybe it's time to hard wire including the transformers without octal bases.






References:


The Pleiades Bias - euroelectron


Operating Features of the Audion - E.  H.  Armstrong