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The Z switch works, and everything seems to be wired correctly. No shorts between the secondaries (different voltages on all three). Here's the oddity: With either an 8 Ohm or 16 Ohm load, the power output (and of course voltage swing) are highest on the 8 Ohm tap. ??
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There are 2 ways these are wired up, depending whether head or combo.
The labelling is confusing, and it may have been rewired by someone.
They are either 4 & 8, or 8 & 16.
Maybe yours has been wired for 4 & 8 ?Originally posted by Enzo
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Agree, labelling is confusing, 2 way switch (it should have been a 3 way one selecting 4/8/16) says "8" one way, "4/16" the other, and *usually* has the 16 ohms wire attached, the 4 ohms one unconnected and taped out.
What irks me is that user may have wired the 4 ohms tap instead for his own convenience, which is fine, but nothing visible from the outside shows this.
At least they should have provided 2 small rectangles or circles where user may write an "x" or a "*" with a Sharpie pen to indicate which one is actually wired.
Each one which goes through my shop gets a small sticker stating either 4 or 16 ... some 0.000001% of all JCM900 out there
Oh well.Juan Manuel FaheyComment
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I had one a while back that was wired wrongly (it was neither 16/8 or 16/4), but this one a correct 16/8 (the 4 Ohm tap goes only to the NFB resistor).Comment
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Are you getting proper power with some combination? Can you try a 4 ohm load anyway (quick test)?
Post your power output results for both switch settings using 4,8, & 16 ohm loads. The OT should be able to handle the mismatches if you are just doing quick tests.Originally posted by Enzo
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