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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Re: what determines the "speed" of an amp? posted by Trevor Wilson on February 12, 2000 at 14:35:30:
Hi Trevor,
Um, well your GHz region maser, klyslotron and magnetron tubes aren't exactly operated the same way as a triode or pentode, and yes, I know tubes can get up there (got an old LCZ bridge that uses tubes and measures up to 170MHz... was tinkering with radio before audio), but the major frequency limiting parameters are geometry (stray capacitance and inductance acting to limit f.... one good reason for chip caps and resistors) and physical size (takes time for electrons to mozey from the emitter to the plate, determined by the gap and voltage differential)... I can find little IC amps that operate to 10GHz for a few bucks, but would be real hard pressed to find a tube amp that would operate that high. Kind of a moot point in the audio world when both tubes and x-sistors can provide useful amplification in the MHz region, but my reply was meant in a practical sense for commonly available parts. Tubes still rule for high voltage high current switching... EE&G makes a tritium doped tube that operates as a triggered spark gap and was used in A-bomb triggers, but it is equivalent to an SCR not a transistor. In any case, I do agree with you in the sense that what the dealer told Suzy was wrong by virtue of being totally irrelevant.
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Follow Ups
- Re: what determines the "speed" of an amp? - Pam 22:30:37 02/12/00 (0)
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