In Reply to: RE: Output Impedance posted by Tre' on February 15, 2025 at 09:22:04:
Earlier you questioned the value of the 100k resistor to ground but now you're saying that the 330k that's in series actually creates more of a problem??
Perhaps I'm mistaken but I thought that the resistance in series (330k in this case) only affects the calculation of the -3db rolloff point.
If resistance in series is added then, if the amp has a volume pot on the input, wouldn't that also affect the output impedance of the preamp?
Say you're using a 100k pot. Whatever portion of the 100k that's in series with the grid of the amp's first tube would be added to the output impedance of the preamp??
If that were the case it seems like the use of a voltage divider, or an adjustable voltage divider aka a volume pot, would technically create an impedance mismatch in many cases. Perhaps most cases.
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Follow Ups
- RE: Output Impedance - FlaCharlie 10:46:24 02/15/25 (4)
- RE: Output Impedance - Chip647 12:11:47 02/15/25 (0)
- RE: Output Impedance - Tre' 11:54:11 02/15/25 (2)
- RE: Output Impedance - FlaCharlie 13:16:19 02/15/25 (1)
- RE: Output Impedance - Tre' 13:40:12 02/15/25 (0)