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In Reply to: RE: Nuvistors posted by jedrider on June 26, 2015 at 07:34:42
No longer made, not particularly linear, prone to VHF oscillation. There are dozens of glass tubes that are far superior for our use.
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Buy Chinese. Bury freedom.
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Here is another example of the numbers not matching the sound.
I own three tuners... MR 77, HK Citation 14, Scott 312
I have owned close to 100 tuners at one time or another, including a Marantz 10B
The Scott with 4 nuvistors is today one of three I still own.
Tis about the sound. Obviously, we have not figured out what to measure... and or, have not figured out how to correlate what we measure to what we hear, one of the most fascinating facts about our hobby.
One must keep their ears open, as well as one's mind.
The Mind has No Firewall~ U.S. Army War College.
"The Scott with 4 nuvistors is today one of three I still own."
I doubt the nuvistors are responsible for whatever you're hearing. Those old tuners used nuvistors as RF amps for FM signals, a function in which linearity is immaterial. In fact, later elements in the signal chain completely quash any amplitude variations prior to the audio detector. Of course, if you're far enough away from the towers that the S/N is suffering with lesser tuners, the nuvistors could certainly serve to reduce the noise.
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Buy Chinese. Bury freedom.
"I doubt the nuvistors are responsible for whatever you're hearing. Those old tuners used nuvistors as RF amps for FM signals, a function in which linearity is immaterial."
Actually, you want linearity in the front end of an FM tuner. To avoid intermod distortion products coming from the mixing of strong FM stations from trashing desired weaker stations.
Spectrum analyzers (FFT analyzers) running on a PC using a sound card can be markedly elucidating.
The learning curve for me was outstanding in the rain without an umbrella. I now know why an amp with 5% distortion can sound better than one with .5% and that knowledge has changed my approach to building better sounding amplifiers.
Thanks again to the genius of Richard C. Heyser.
The Mind has No Firewall~ U.S. Army War College.
"I now know why an amp with 5% distortion can sound better than one with .5%"
Hey now, you can't just say something like that and not tell us why! :)
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Buy Chinese. Bury freedom.
i tested a vintage musical fidelity "Nuvista 3D CD" 24 bit CDP. great stuff! stunning holographic musical performance. buy it if you can get one!
Nunki
The times, they are changing...
I am enthused by the round plate design, which I imagine is quite different than the very successful Tung Sol round plated glass tubes. I just wonder why others didn't make more in that fashion.
Steve
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