If those are the C core output transformers from AliExpress, I would be very interested in any measurements you could take of them.
Input/driver tube is 6N2P-EV. Output tubes parallel 4P1L. Coupling caps are Russian FT-3 Teflon type. Bias voltage of 4P1L tubes provided by the small batteries. Output transformers are done by Automatic Electric Europe (AE Holland). Laminations 0.05mm thick and double c core. Amp has a switching power supply unit.
Very compact build..
I see that two batteries are used for Bias..
Since 4P1L bias normally ranges around 15-18v, how much bias is being used in your amp.
Thanks
I see that two batteries are used for Bias..
Since 4P1L bias normally ranges around 15-18v, how much bias is being used in your amp.
Thanks
4P1L power supply
Can any share any details on switching supply such as rating, source etc?
Am thinking of using these in my next build and your experience could be useful.
Cheers!
Ravi
Can any share any details on switching supply such as rating, source etc?
Am thinking of using these in my next build and your experience could be useful.
Cheers!
Ravi
I've been using PSE 4P1L outputs for several years, and thought I was getting good sound. However, since switching to 300b outputs I can clearly hear the shortcomings of PSE 4P1L relative to the 300b. 300b needs a different circuit, but I think it's worth the switch. Maybe I could have implemented the 4P1Ls better, who knows!
PSE 6e5P is certainly possible - I have some. Have you compared them to the 4P1L as output tubes? They could be driven with an opamp, which is my latest craze for an input stage.
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Yes! You helped push me in a new direction. I ditched the 300b outputs and am now using medium mu indirectly heated tubes in the output with DHT inputs. Shifting the DHT to the input has given me great sounds - the DHT seems to dominate the sound, which is what I want. Using 01A in the input now. Needs an output tube with a mu of at least 15 in my system, but that's quite achievable.