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Old 20th September 2007, 11:17 PM   #1
mus is offline mus  Canada
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Default 6S4P vs 5842

Hi,

Does anybody have experience of using 6S4P as a driver for 300B SE amp? How are the sonic differences? I know lots of peoples were using 5842 for the driver, but they are expensive and less available. Also I'm planning to build a simple 6AS7G SE amp with the 6S4P for the driver (CCS loaded and LED bias). The B+ is 325V. Would it be has enough voltage swing for the 6AS7G? Thanks!
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Old 22nd September 2007, 06:33 AM   #2
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Do yourself a favor and run your 6AS7 at something like 100V plate to cathode. Then drive it with a 12B4 or a 5687. You won't be sorry as the sound will be better.

Shoog
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Old 23rd September 2007, 10:03 PM   #3
mus is offline mus  Canada
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Thanks Shoog! I'll try it for sure.
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Old 23rd September 2007, 11:02 PM   #4
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Hi mus

I can not really help you as I have not tested any of the tubes. Actually (looking at the specs and due to KWY recommendations) I bought some 6S4P's, but have not been able to put them to service, yet. It seems that some russian tubes are good, and matched (the 6N6P), while others aren't (the 6S45P), so I am curious how the 6S4P will behave. Please let us now about your experience...but if the experience is to good to be true, than please let me know by PM, as not to increase the demand, and price, for the tube

I do not know if you searched, but Shoog has built an amplifier with the 6AS7 operated at 100V/100mA. With this operating points the tube biases at about -30V, so it will require a driver stage that swings some 25VRMS, which should not be hard to accomplish (I think). Still, the 12B4 may be unable to the task, as it's mu is of only 6. (I don't know the mu of the 5687, never found this tube going for peanuts, so haven't bought it).

Good luck, Erik
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Old 24th September 2007, 03:50 PM   #5
kevinkr is offline kevinkr  United States
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I recently purchased some 6S4P-EV to try and currently use 5842 in my phono stage, and two head phone amplifiers - should be interesting to try them in a couple of different applications. They do look nicely made, and I am hopeful that they will perform as well.
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