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The Nuvistor RF amp made a significant improvement in RCA TV performance. On comparison tests I witnessed, RCA Nuvistor TV's ability to "hold sych" improved from 10-30 microvolts to a comfortable 5 uv. That works out to about 6-10 db. Anchoring all the elements to a ceramic base reduced internal noise.
Other tetrodes and frame grids also made improvements so comparisons from year over year were more significant than from brand to brand in the same year. There are other metrics beside "holding sync" of course, however the performance was impressive.
Improved RF and IF tubes soon allowed eliminating an IF stage, enabling comparable performance with two video IFs (for B&W). It all soon gave way to transistors.
Don
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03-08-2009, 09:21 PM
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