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Author Topic: Wiring diagram needed  (Read 7592 times)
GeeDub
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« on: February 07, 2012, 11:08:28 PM »
Does anyone have a wiring diagram for a ppimv for a jtm45 using a 500k dual pot?

G
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wyatt
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« Reply #1 on: February 08, 2012, 05:20:06 AM »
Just use the LarMar-based one Ceriatone posts with the 500K pot.  Though I think most people prefer the 250K.  Still it doesn't hurt to try.




For a more traditional 500K PPIMV, all I can link is a schematic, but it's so amazing simple you should be able to apply it if you are planning on working in the amp.  (but I still think the LarMar is the way to go).

www.blueguitar.org/new/schem/misc_mod/pi-m-vol.pdf
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GeeDub
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« Reply #2 on: February 08, 2012, 05:34:34 AM »
Thanks much
Does this diagram look usable?

* 1-35db4c04d1.jpg (45.22 KB, 488x446 - viewed 816 times.)
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GeeDub
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« Reply #3 on: February 09, 2012, 08:39:51 PM »
I decided to go with the LarMar based ppimv using a 500k dual pot. My only question now is the mv type2 diagram shows 2 - 2.2M resistors mounted to the 250k pot. Using a 500k pot, would the 2.2M value be ok, would I need a different value, would I need any resistors at all?

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wyatt
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« Reply #4 on: February 10, 2012, 05:23:23 AM »
Quote from: GeeDub on February 09, 2012, 08:39:51 PM
I decided to go with the LarMar based ppimv using a 500k dual pot. My only question now is the mv type2 diagram shows 2 - 2.2M resistors mounted to the 250k pot. Using a 500k pot, would the 2.2M value be ok, would I need a different value, would I need any resistors at all?

G

Yes, they don't quite correct as much, but you run into other issues if you try and increase them.  If the 500K don't satisfy, you are better off swapping the pot instead of those resistors.
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GeeDub
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« Reply #5 on: February 10, 2012, 05:41:45 AM »
So, the 2.2m's would be ok to use?
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GeeDub
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« Reply #6 on: February 12, 2012, 07:05:34 AM »
Anybody?
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GeeDub
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« Reply #7 on: February 16, 2012, 06:03:37 PM »
At Wyatt's recommendation (thanks again), I installed the LarMar based ppimv using a 250k dual pot. Very easy to install, sounds great. Gives you more tonal variety at a useable level.

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wyatt
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« Reply #8 on: February 16, 2012, 06:50:04 PM »
Quote from: GeeDub on February 16, 2012, 06:03:37 PM
At Wyatt's recommendation (thanks again), I installed the LarMar based ppimv using a 250k dual pot. Very easy to install, sounds great. Gives you more tonal variety at a useable level.

G

excellent.  And yes, use 2.2M.
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