How did you verify that the high frequency response is declined ?
Do you have long cable at the output ?
Actually there is a chance to have poor low frequency response because the capacitor at the output is just 20 nF.
It should be minimum 10 x bigger (220 nF...470 nF).
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hi there
Big OOPS here, wrong schematic, new one attached (its from the same person that designed the first one, he made a few changes).
about wiring: short as possible (<1m shielded)
how i finded out? bypassing the preamp there is a lot of treble being played thru it: almost none.
tubes are matsushita.
Big OOPS here, wrong schematic, new one attached (its from the same person that designed the first one, he made a few changes).
about wiring: short as possible (<1m shielded)
how i finded out? bypassing the preamp there is a lot of treble being played thru it: almost none.
tubes are matsushita.
Attachments
I assume this is some sort of guitar preamp/FX box? That would explain why the designer believes that any twin triodes with the right pinout can substitute for each other.
Does the amp you are driving have an input RF filter? If so, its capacitance combined with the fairly high output impedance of this preamp will reduce treble.
Does the amp you are driving have an input RF filter? If so, its capacitance combined with the fairly high output impedance of this preamp will reduce treble.
good question, is a Realtek codec based onboard audio, I have no idea of the impedance of it
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