Phono amp: why tie the cathode to the output?
"choobs"
It's an old Magnavox phono amp. Stereo using one 6EU7 (twin triode)
and 2 6BQ5's. The speaker outputs are Left, Right, and a Common
connection. The cathodes of both 6EU7 sections are tied to the
respective speaker outputs through a resistor with capacitor bypass
and one 6k8 resistor. The Blue OT wire hooks up at the speaker output
also, of course.
** I take it the OTs are attached to the speakers ?
Why connect things this way? Is it part of the RIAA
equalization? Feedback?
** Negative feedback, all right.
Also, the screen B+ is connected to the 6EU7 cathode pins.
** No way by a direct connection.
Can someone shed some light on any of this? I'd like to
change a few things and drive it with a portable cd player if that's
possible. Thank you.
** Hope the old heap of **** has an AC power transformer ???
Be lethal without one.
........ Phil
|