Looking for nuvistor pre-amp preamp schematic please. 6CW4? - diyAudio
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Old 24th July 2006, 05:27 PM   #1
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Default LOOKING for NuVistor preamp preamp schematic pls.. 6cw4 ?

anyone seen good/best nuvistor 6cw4 or better nuvistor schematic for preamp ?

anyone build one ? how is the sound quality compare to bigger/glass tube ?

cal
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Old 24th July 2006, 07:14 PM   #2
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rP = 5.44k, gm = 12.5k umho, mu=68 Cgp = 0.92pF - from the 1964 ARRL Handbook -- I used this tube in a VHF preamplifier.
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Old 24th July 2006, 07:45 PM   #3
SY is offline SY  United States
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Very, very, very microphonic. And not terribly quiet. They look cool, but are hardly worth the effort.
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Old 25th July 2006, 01:09 AM   #4
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any Schematic ppreamp for 6cw4 ?

cal
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Old 25th July 2006, 08:05 AM   #5
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Default schematic

Hi,
there is one schematic published by tnt

http://www.tnt-audio.com/clinica/preamble_n.html
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Old 25th July 2006, 08:14 AM   #6
mach1 is offline mach1  Australia
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cal,

I believe the TNT website has a Nuvistor linestage posted somewhere.

However, I couldn't recommend the 6CW4: the gain is way too high for a linestage and the plate curves http://frank.pocnet.net/sheets/049/6/6CW4.pdf
are decidedly non-linear.

I think half the perception problem with nuvistors is due to Musical Fidelity using them to suck magazine journos into thinking they had made great advances in the art of amplifier design (a bit like Tim de P using 12AX7s as output tubes). If you want to go small there are some really good subminiature tubes around (eg 6111, 5977) at reasonable prices that would make excellent linestages. I believe Quad use the 6111.

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