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The Melbourne Class A Headphone Amp and Pre-amp
The Melbourne Class A Headphone Amp and Pre-amp
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Old 21st February 2020, 06:48 PM   #81
wowbagger is online now wowbagger  United States
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I'm looking at the distortion spectra when used to drive a BA-2 output stage.


Do you have some clarification for the 8.2 Ohm resistor?
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Old 21st February 2020, 07:13 PM   #82
xrk971 is online now xrk971  United States
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The Melbourne Class A Headphone Amp and Pre-amp
It has test points across it and is used to check the bias current. It may have some minor effect of optimizing the relative H2/H3 distortion profile. You could use a smaller value (2R2) just fine but may need to rebalance output node for 0v.
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Old 21st February 2020, 07:18 PM   #83
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Thanks. I take it then that it's not critical whether it connects like "A," as in your first schematic, or like "B," as in the "JPS" schematic? Of course, beyond sensing a different current.
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Old 22nd February 2020, 08:45 PM   #84
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