TUNG-SOL KT120 and KT150 valves

[ultima legione]

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Apart from a fairly marginal difference in terms of Cathode Filament Current and a Plate Dissipation of about ten Watts in favour of the KT150, from an electrical point of view (Anode Voltage, Impedance, Transconductance etc.), the TUNG-SOL KT120 Power Pentodes and the more recent TUNG-SOL KT150 are practically the same.
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But since I'm very keen to experiment with the newer sisters on my Single-Ended amplifier currently equipped with KT120s, I wanted to ask those who have already experimented with them about any contraindications of use, but above all about their differences in terms of general musicality.
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I thank in advance all those who would like to share and contribute their experience.

 

[baudouin0]

Have you considered two 6550's or KT88's in parallel?

 

[stevenrotterdam]

And now there is a kt 170

 

[ultima legione]

Have you considered two 6550's or KT88's in parallel?

Yes.

In fact, the Single-Ended Amplifier on which I would like to experiment with the KT150s was originally designed with KT88s, but thanks to a switch that changes the value of the resistance on the cathode of the power valves and an automatic bias adjustment system, it can also mount KT120s.

 

[baudouin0]

Obviously, you cannot fit two KT88 then. You don't get much more power output unless you can increase the HT as well for the bigger devices. Like the indented labeling on the front panel do you have a schematic to share.

 

[Moderation Team]

If this thread continues to veer off into political discussion following this clean up of rules breaking posts then the thread will be closed.