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Got an nfb question now that I figured out mine works
Posted: Tue Dec 18, 2007 10:03 pm
by charvel pointy head
after the revelation that ppimv's affect this, mine works great.
Here's the deal, I have mine on teh 16 ohm tap, but I'm using a 100k resistor. What change would I experience if I drop to a 47k?
Posted: Wed Dec 19, 2007 12:49 am
by rockstah
in theory more neg feedback. ( smoothing of the tone ) but using the PPIMV u probably wont hear any difference going from 100k to 27k especially if we are talking bedroom level.
get that PPIMV up to 3..4..5 and you will hear it. try it. its two solder joints.
Mark
Re: Got an nfb question now that I figured out mine works
Posted: Wed Dec 19, 2007 12:50 am
by ScottW
charvel pointy head wrote:after the revelation that ppimv's affect this, mine works great.
Here's the deal, I have mine on teh 16 ohm tap, but I'm using a 100k resistor. What change would I experience if I drop to a 47k?
You'd get more negative feedback.
More nfb = tighter, smoother, tamer
Less nfb = rawer, more gain
Posted: Wed Dec 19, 2007 3:33 am
by rockstah
but like i said you wont hear a difference until u get that PPIMV up loud.
Posted: Wed Dec 19, 2007 9:18 am
by ScottW
rockstah wrote:but like i said you wont hear a difference until u get that PPIMV up loud.
+1
Posted: Wed Dec 19, 2007 1:04 pm
by charvel pointy head
now I'm torn. I like "raw" I like more "gain" I'm still a metal head at heart here. I think I will just try it and see if I like it?
Posted: Wed Dec 19, 2007 2:24 pm
by HEAVIER THAN HELL
My fave has always been 68k on the 8ohm tap.
Posted: Wed Dec 19, 2007 3:07 pm
by rockstah
sigh
Posted: Wed Dec 19, 2007 6:00 pm
by HEAVIER THAN HELL
rockstah wrote:sigh
???
Posted: Wed Dec 19, 2007 6:07 pm
by rockstah
hes not getting that yer not going to hear any effect with a different feedback resistor using a PPIMV unless that amp is loud. at 5 on the PPIMV u get 50% of your neg feedback circuit working the way it should. and thats if hes using a lin pot. with a log pot, what the master calls for, its more like 50% of circuit is back in effect with the volume at 7 or 8.
Posted: Wed Dec 19, 2007 7:30 pm
by toner
charvel pointy head wrote:I like "raw" I like more "gain" I'm still a metal head at heart here.
Based on this, you should probably go for
less negative feedback. Lowering the resistor value will give more NFB. Try your 100k on the 8 or 4 ohm taps.
As Mark mentioned, it won't make much difference until the MV is cranked up a ways.
Posted: Thu Dec 20, 2007 11:23 am
by curtg
toner wrote:Try your 100k on the 8 or 4 ohm taps.
As Mark mentioned, it won't make much difference until the MV is cranked up a ways.
+1
My 73 is 100k on the 4 ohm tap.
Posted: Thu Dec 20, 2007 4:56 pm
by HEAVIER THAN HELL
rockstah wrote:hes not getting that yer not going to hear any effect with a different feedback resistor using a PPIMV unless that amp is loud. at 5 on the PPIMV u get 50% of your neg feedback circuit working the way it should. and thats if hes using a lin pot. with a log pot, what the master calls for, its more like 50% of circuit is back in effect with the volume at 7 or 8.
I was just stating a general preference as I don't use a post-PI master. I can see how it may have been taken wrong.
I'll have to try that post-PI mv with the 2M2 resistors, sounds interesting and your clips sounded great.
