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In Reply to: RE: Don't think so posted by PakProtector on May 08, 2024 at 15:29:11
I was trying to understand what is considered acceptable response at 20Hz and how much inductance is needed to get that in a single ended amp.Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 05/08/24Follow Ups:
well... FWIW here is what spice says.
the basics are 10K OT 211 operating at 1kV -45V bias and around 90ma and inductance is stepped 40, 80 and 160Hy for both 20Hz and 50Hz.
The third "penne" plot has 40Hy of inductance and combination of 20Hz and 1000Hz each at -6dB as the excitation source. This appears to encompass an envelope a lot closer to the 50Hz one than the 20Hz one which is in line with what Partridge claimed was the realistic lowest frequency of interest for music.
personally i would be fine with 40Hy in this case with music being the source.
dave
That operating point (1000v/90mA/10K load) is more suited to A2 operation; in A1 as shown it only make about 8 watts.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
I measured the low frequency -1dB point for the FS-100 (driven by a 211) at 19Hz. I've never measured the inductance of these transformers though. Whatever it is, core flux degrades it considerably when output is increased above a few watts.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
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