2015年12月27日 · I have some 4P1S tubes and got round to running some through the tester as triodes . Compared to 4P1L with -22V grid bias for approx. 35mA anode current ~5mA/V , with …

2018年5月6日 · Hello Gentlemen, I got the itch to build another SE amplifier as I couldn't stay away from the 4P1L, it is one very linear valve when wired as a triode and it seems to be very …

2020年6月14日 · Ah, OK. In that case you are looking for a driver for PSE 4P1L to replace the 6e5p. I never liked the sound of 4P1L into 4P1L - seemed to accentuate some kind of …

2013年8月20日 · Time to start the Ikoflexer all DHT headphone amp with 4P1L & 307A (attached schematic). For 4P1L heaters I have Rod Coleman, for 307A I want to use Pete Millet …

2024年2月25日 · 4P1S(Chinese version of 4P1L) triode at about 225V 30mA, with 5K OPT. Self bias with LM317 constant current sink. Cathode capacitors from cathode to GND and B+ tap …

2023年10月22日 · Refer to the photo below, block A,,,,thinking of using ccs,,,40H choke or ccs 2a3 set at 40mA for ,,,4p1s set at 25mA,,,or maybe a pure resistor?And I have issues when …

2021年8月2日 · The IRF610 for 4P1S (4P1L), on the other hand, was biased at 42 mA. It looks like good enough to drive the 4P1L. However, what are the design criteria for this MOSFET? Is …

2011年2月17日 · Even though I don't believe much in huge differences in sound between tubes of the same model, I am curious if anyone compared the Russian 4P1L with the similar Chinese …

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2020年9月28日 · All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum