A-430 OPT's Secondaries Strapping

[Ty_Bower]

I second what Eric is saying. It is some of 'zobel network' - forgive the term in this application.

Back to the 680 ohm resistor on the Mark III schematic...

I'll assume the right thing to do is remove it if you are installing the Poseidon board? This resistor is only appropriate for the stock Mark III driver circuit, correct?

[Shannon Parks]

Hi Ty,

I did all my testing with it in there, so leave it. I do believe my schematic doesn't show it, though it is on the parts list. One more item I need to fix.

[EWBrown]

I'd just leave it in place. That high of a resistance, 680 ohms vs 8 or 16 ohms impedance will have little detectable effect on the frequency response. We're talking on the order of millibels here Yellow_Light_Colorz_PDT_06

Probably served as a transient suppressor / snubber, or offered some minor protection against operating the amp with no load attached (NOT a good thing to do...)


/ed B in NH

[Ty_Bower]

You're right, the Poseidon schematics do not show it.

Guess I'm going to have to get a couple new 680 ohm resistors. This one looks like it's blown a chunk.