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In Reply to: RE: Metallic oxide resistor ok sounding in the feedback position? posted by DAK on August 14, 2015 at 01:38:42
Can't think of a more deserving place for a quality resistor. Also a good place for picking a resistor to give the overall sound you want. I'd be thinking good carbon film if amp was sterile/cold and metal film (or wire wound) if it wasn't.
Don't even like metal oxide for power supply work.
Follow Ups:
I usually put in a hi quality carbon film or metal film for the FB resistor, too. But I was in a bind needing to get the unit sorted before it was sold. Like I said I was pleasantly surprised that the resistor sounded better than the Dale rn65 that it replaced. cheers, Dak
The issue is (IMO) precision. If 5% tolerance parts are being used in the feedback positions, they should be meter matched. Remember, when open loop gain is sufficient, the NFB resistors control overall circuit behavior.
I can see not using a RN65 part in the line from O/P trafo back to the small signal circuitry. Metal film parts do have a reputation for "coldness".
BTW, in "El Cheapo", we used meter matched carbon composition parts in the feedback lines. That setup applies the NFB to a high impedance grid, instead of a low impedance cathode, and inductance on the part of the FB resistor could cause trouble. Carbon comp. is both inexpensive and non-inductive. :> D
Eli D.
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