The PPIMV (Post-PI-Master-Volume) thread.

Info for maintaining and tweaking your amp to perfection.

Moderator: VelvetGeorge

uiovbged332
Senior Member
Posts: 147
Joined: Tue May 31, 2022 5:29 am
Just the numbers in order: 13492

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by uiovbged332 » Wed Jul 06, 2022 5:22 pm

Nikes Shoes
Jordan 33
Wholesale Nike Shoes
Wholesale Adidas
Cheap Jerseys From China
Jordan 21
Nikes
Yeezy Butter
Air Jordan 1
Cheap Jordan Shoes
Nike Free rn
Nikes Shoes
Jordans 24
Cheap Jordans
Nike Shoes
NFL Shop
Nike Blazer
Nike Outlet Store Online Shopping
MLB Jerseys
Air Jordan Shoes
Jordans 6
Pandora Bracelet
Nike SB
Jordan 14
Jordan 11 Low
Air Jordan 18
Nike Huarache
Lebron Shoes
Jordans 26
Air Max 270
Jordan AJ 1
Nike Running Shoes For Women
Cheap Jordan Shoes
Jordan 2
Jordan 34
Nike Shoes
Jordan 32
Jordan 25
Nike Slides
Jordan 4
Jordans 29
Nike Store
Jordan 35
Nike Epic React
Jordan 5 What The
Nike Running Shoes For Women
Christian Louboutin Shoes
Air Jordan Retro
Nike Air Max 270 Flyknit
Jordan 22
Pandora
Jordan Retro 12
Air Force Ones
Nike Cyber Monday 2019
Nike Flex
Jordan 19
Jordan 20
Nike Shoes Outlet Store Online Shopping
Wholesale Adidas
Nike Free
Air Jordan 33
Air Max
MLB Jerseys
NBA Store Canada
Official Nike Outlet Online Store
Nike Women's
Wholesale Jordans
Cheap Nike Shoes From China
Nike Clearance Store
Jordan 31
Cheap Wholesale Nike Shoes Free Shipping
Nike Air Force 1 Mid
Huarache
Pandora Jewelry
Air Jordan 13
Adidas NMD
Air Max 720 Flyknit
Jordans 12
Fjallraven Kanken
Adidas Store
Jordan 11 Retro
Nike Air Max
Nike Sneakers For Men
Cheap Jordans Wholesale
Cheap Wholesale Nike Shoes And Clothing
Nike Outlet Online
Jordan 12
Jordan Retro 11
Dior Jordans
Michael Jordan Shoes
Jordans 23
Christian Louboutin Shoes
Nike Air Max 2019
Pandora Jewelry
Air Force Ones
Red Bottoms Louboutin
Cheap Adidas Shoes For Men
Nike Shoes
Pandora Charms
Jordan 27
Nike Jordan 1 Mid
Nike Air Force 1
Pandora Rings
Nike Zoom Pegasus
Wholesale Nikes
Nikes Shoes
Nike Running Shoes
Nike Outlet Store
Custom Jerseys
Jordan 33
Wholesale Jerseys
Nike Wholesale
Jordan 13
Nike Outlet Store Online Shopping
Nike Cortez Men
Jordan 28
Adidas Canada
Jordan 15
Nike Shoes For Men
Jordan 11
Air Force 1
Nike Outlet Canada
Nike Shoes
Nike Shoes
New Jordans 2021
Pandora CZ Charms
Foamposites
Pandora Jewelry 70% off Clearance
Pandora
Wholesale Nike Shoes China
Cheap Jordan Shoes Supplier
Jordan 30
Adidas Yeezy
Adidas Outlet Store
Nike Zoom
Nike Air Jordan Shoes
Wholesale Nike Air Max
Nike
Huaraches
Rings Pandora
Cheap Adidas Shoes
Wholesale Air Jordans
Jordan 16
Cheap Jordans
Toddler Jordan
Nike Wholesale
Jordan 17
Nike Foamposites
Nike Blazer Mid
Nike Factory Store
Air Force 1
NHL Shop
Adidas Yeezy Boost 350
Off White x Nike
Jordans For Kids

uiovbged332
Senior Member
Posts: 147
Joined: Tue May 31, 2022 5:29 am
Just the numbers in order: 13492

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by uiovbged332 » Wed Jul 06, 2022 8:18 pm

Golden Gooses Sneakers
Nike Snkrs Website
Pandora Jewelry Official Site
Moncler Outlet
Air Max 90
Jordan Retro 11
Birkin Bag
Kyrie Shoes
Jordan Retro 14
Nike Shoes
Nike Mens Shoes
Pandora Ring
Nike Air Max 98
Air Jordan Retro
Jordan 5
Nike Shoes
Golden Goose Outlet
Christian Louboutin
Jordan 9
Air Jordan
Air Max 95
Air Jordan 4 Retro
Pandora Jewelry
Nike Shoes
Nike Outlet
Ferragamo Shoes
Jordan Retro 3
Golden Goose Mid Stars
Air Jordan Sneakers
Red Bottoms Louboutin
Nike Factory
Adidas Yeezy Boost 350
Valentino Sneakers
Ferragamo Outlet
Jordan 11 GYM Red
New Jordans 2021
Jordan Retro 12
Jordan 4 Retro
Nike Air Force
Jordan 11
Jordan Retro 11
GGDB Sneaker
Huaraches Nike
Jordan 5
Cheap Nike Shoes
Jordan Retro 6
Red Bottom Shoes
GGDB Shoes
Jordan 11s
Win Like 96
Men Moncler Vest
Air Max
Pandora Charms
Moncler Outlet
Fitflop Shoes
Moncler Outlet Store
Jordan Shoes
Air Jordan 6 Rings
Adidas NMD R1
GGDB Shoes
Jordan 4 Retro
Pandora Jewelry
Jordan Shoes
ECCO Shoes For Men
Air Jordan 11
Red Bottom Shoes
Pandora Charms
Golden Goose Sneakers
Air Jordan
Moncler Jackets
Yeezys
Nike Shoes On Sale
James Harden Shoes
Air Jordan Sneakers
Golden Goose Sneakers
Nike Outlet Online
Air Max 2018
Nike Air Max 270
Jordan Shoes For Women
Moncler Jackets
Jordans Sneakers
Yeezy Shoes
Balenciaga Sneakers
Jordans Retro
Jordan 13s
Golden Goose Sale
Golden Goose Sneakers Sale
Cheap Jordans For Sale
Air Jordan 6
Pandora Ring
Yeezys
Adidas NMD
Moncler Outlet
Christian Louboutin Shoes
Soccer Shoes
Pandora Jewelry Official Site
Air Jordan 3 Retro
Jordan Retro 10
Yeezy
Jordan Retro 11
Retro Jordans
Golden Goose
Pandora
Moncler Jacket
Air Jordan Retro 12
Golden Goose Shoes Men
Fjallraven Kanken Backpack
Air Jordan 12
Jordan 1
Air Jordan Sneakers
Pandora Bracelets
Nike Outlet Shoes
Harden vol 1
Nike Outlet Store Online Shopping
Jordans 11 Retro
Yeezy
Air Jordans
Retro 4 Jordans
New Jordan 11
Jordan 11
Jordans Sneakers
Pandora Charms
New Jordans
Pandora Jewelry Canada
Jordan 11s
Moncler
Balenciaga Sneakers
Jordans Retro
Pandora Charms
Jordan Retro 5
Women Nike
Nike Website
Fitflops Clearance Outlet
Jordan 12 Retro
Jordan 8
Air Force One Shoes

ledvedder
Senior Member
Posts: 204
Joined: Fri Jan 15, 2010 10:51 pm
Just the numbers in order: 7

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by ledvedder » Thu Aug 11, 2022 12:17 am

Has anyone installed 2 PPIMV's in a plexi circuit? If so, I'd love to hear your thoughts.

User avatar
CoffeeTones
Senior Member
Posts: 1112
Joined: Mon Oct 11, 2010 9:52 pm
Just the numbers in order: 7
Location: USA

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by CoffeeTones » Thu Aug 11, 2022 12:06 pm

What would the purpose or goal be? Using two at once or investigating notable differences between different types?

ledvedder
Senior Member
Posts: 204
Joined: Fri Jan 15, 2010 10:51 pm
Just the numbers in order: 7

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by ledvedder » Thu Aug 11, 2022 1:07 pm

In order to have 2 switchable volumes. A rhythm volume, and a lead volume.

I found this old thread, viewtopic.php?t=45431

User avatar
CoffeeTones
Senior Member
Posts: 1112
Joined: Mon Oct 11, 2010 9:52 pm
Just the numbers in order: 7
Location: USA

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by CoffeeTones » Thu Aug 11, 2022 2:09 pm

That's a bulky and possibly noisy way to do it. I think a better way is to use a second, dual pot. Connect / jumper it's wiper and ground terminals to the existing PPIMV wiper and ground terminals, but use two additional limiting resistors as one pair of jumpers to set the preferred resistance adjustment range as well as for protection. Of course, provide the switching of your choice. About as compact and simple as possible.

User avatar
axeman
Senior Member
Posts: 2464
Joined: Wed Apr 02, 2008 1:21 pm
Just the numbers in order: 7
Location: Los Angeles
Contact:

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by axeman » Thu Aug 25, 2022 9:19 pm

novosibir wrote:
Wed Jun 29, 2022 7:23 pm
CoffeeTones wrote:
Wed Jun 29, 2022 5:06 pm
Unless you use a multi conductor, shielded wire instead of separate PPIMV leads.
If you use shielded wires, then don't 'ground' the shield, but use it to run the negative bias voltage from the board to the PPIMV pot
Why use the Shielded wire for negative bias

User avatar
novosibir
Senior Member
Posts: 4654
Joined: Tue Nov 22, 2005 2:32 pm
Just the numbers in order: 7
Location: Nuernberg, Germany
Contact:

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by novosibir » Fri Aug 26, 2022 6:40 am

axeman wrote:
Thu Aug 25, 2022 9:19 pm
Why use the Shielded wire for negative bias
Any clean (not RF or remaining hum contaminated) DC in the amp is as good as ground. You'd save one wire
The fault almost always is sitting in front of the amp :wink:

Larry's Website now with included Pix's Gallery

Reg18
New Member
Posts: 2
Joined: Sun May 07, 2023 2:48 pm
Just the numbers in order: 13492

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by Reg18 » Mon May 08, 2023 3:08 am

Hoping to get some assistance with a new amp I’ve just bought. A JCM800 1959 model.
It’s had a few mods, someone suggested RR type mods but I’m unsure.
It has a MV installed on the front but it increases the gain/saturation along with the volume so I’m guessing it’s a pre Pi MV.
It can achieve some really nice cleans with the MV down, my question is if I changed the MV to a PPIMV would I loose the ability to get those nice cleans?
I suspect it’s had a cascading mod done so it can’t get clean sounds if the MV is up full currently.
Here’s a video of the amps tones (booster with an OD for some of the video)
https://youtu.be/ldR8dzzraPo

User avatar
CoffeeTones
Senior Member
Posts: 1112
Joined: Mon Oct 11, 2010 9:52 pm
Just the numbers in order: 7
Location: USA

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by CoffeeTones » Sat Nov 18, 2023 8:40 pm

No idea what is inside, but if it has a proper cascade mod you should not need to have a jumper wire at the inputs. The amp doesn't really sound like a cascaded preamp to me, If it has stock inputs and circuit, you should be able to remove that jumper wire and get cleans in either channel with the master up and preamp down along with reducing guitar volume. One fat channel and one bright channel. With channels jumpered, both preamp volumes contribute to the bass, treble and gain. The PPIMV in this thread doesn't really change the sound unless you turn it way down low. At that point it is at speaking volume and gets a little buzzy.

danman
Senior Member
Posts: 1099
Joined: Tue Sep 10, 2013 9:09 pm
Just the numbers in order: 13492

Re: The PPIMV (Post-PI-Master-Volume) thread.

Post by danman » Mon Nov 20, 2023 8:30 pm

Turning up the master volume pot should not affect your clean sound. It should get louder but it should not add distortion unless you turn it way up and start overdriving the power tubes. If turning the master volume up slightly begins to add distortion, it is not a master volume. It's likely a second volume (gain) pot that was added early in the preamp. It may work in conjunction with the mod that you think was installed.

Post Reply