Hello to All,
I want to build a single ended amp with 6p21s direct heated pentode tube. In triode mode, anode voltage 450V and current will be 40mA. What I know in practise, primary inductance of output transformer can be selected 2,5-3 times of tube internal resistance. But, it also depends the anode voltage. Anyone can help me to determine the suitable opt primary impedance for above given operating point?
Thank you so much!
Noyan
I want to build a single ended amp with 6p21s direct heated pentode tube. In triode mode, anode voltage 450V and current will be 40mA. What I know in practise, primary inductance of output transformer can be selected 2,5-3 times of tube internal resistance. But, it also depends the anode voltage. Anyone can help me to determine the suitable opt primary impedance for above given operating point?
Thank you so much!
Noyan
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450V seems rather high in triode mode?
Here's some information from my experiements with 6P21S:
Here's some information from my experiements with 6P21S:
I just wanted to get max output power 💪 If 450V is high for it, then I can use 350V-40mA or 250V-40mA. In this case I can get approximately 3,5W or 2,5W. For these working points which opt impedances will be fine?
Actually I have a 6N30P-DR + 4P1L PSE amplifier and fantastic sounding to me. Operation point 250V- 40mA.
I wonder how is the 6p21s sound quality comparing with 4P1L.
Thanks for your comments 🙏🏻
Actually I have a 6N30P-DR + 4P1L PSE amplifier and fantastic sounding to me. Operation point 250V- 40mA.
I wonder how is the 6p21s sound quality comparing with 4P1L.
Thanks for your comments 🙏🏻
I used a 3,5k OPT for my tests but I remember getting the impression that ha higher Z load would be better, like 5k or perhaps even higher.
Before you invest a lot of time and money in this, be aware that this tube has a bad reputation because of its short lifespan.
Before you invest a lot of time and money in this, be aware that this tube has a bad reputation because of its short lifespan.