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

[bill bokey]

It's exactly the same for 1959, 2203 or JTM45

[matttornado]

Sorry but I don't have time to read through the thread but should I use a Linear or Log. pot?

I forget what I have in my amp now but once it gets to about 4, it stops getting louder & sounds the same all the way up to maxed.

Thanks

[novosibir]

Sorry but I don't have time to read through the thread but should I use a Linear or Log. pot?

I forget what I have in my amp now but once it gets to about 4, it stops getting louder & sounds the same all the way up to maxed.

You need LOG and presumably now you have a LIN

Larry

[matttornado]

Thank you, Larry!

[din_mentor]

Hello MetroAmp Forum!

Totally new here, writing to you guys from sweden!
Im about to get myself my first plexi (used 1987 RI from -91) and so far i know 2 things about it:

1. i love the sound!
2. it's so f****n loud!

so im gonna get the LarMar PPIMV installed by a professional amp tech.
i just want to ask, is there any good way of bypassing the PPIMV with a switch?
I ask just because even if i believe in this LarMar concept it would boost my own mind a bit if i could compare with PPIMV on max vol and without PPIMV in circuit.

[CoffeeTones]

The LarMar master has no effect on sound when adjusted fully clockwise. If installed correctly, there is no need for a switch. You could do it but there would be several runs of wire that may cause problems. Why not just do a before and after recording to satisfy the mind?

[din_mentor]

Yeah i guess you are right
and i believe the PPIMV works just as good as all people has said here, i'll just have it installed and be happy.

BTW i read on Metros facebook page in a recent post that George uses type II PPIMV with the 500k dual pot because he thinks (hi George! ) it is the best... that made made me a little confused since i hade just read this whoooole thread! (yeah when you're sick home from work, then thats what you do )
link: https://www.facebook.com/MetropoulosAmp ... 37/?type=1

"My favorite master is the type II PPI-MV using the PEC dual 500k pot. Most transparent and even at lower volumes"

any comments on the 500k? i mean, you got me convinced about the 250k+2.2m but if George uses it then it must be good right?

Sounds good at least:

[CoffeeTones]

The 250k / 2.2M version is correct because when at max, you have a stock amp. It is also "type 2" but has the safety resistors in case the pot fails. George is good but Larry is better.

[novosibir]

... is good but Larry is better.

Haha, thanks for the flowers

Larry

[matttornado]

So would it be a waste of money to upgrade from a Alapha Pot to a Pec pot? I already have a 250K LOG alpha pot.
The only difference I can see would be durability.

[CoffeeTones]

Never had a problem with the Alpha pots, but I usually buy a few of them in order to find one that is closely balanced. Not that the matched pot makes a big difference, I just prefer it that way. It would be nice if the Alpha pot had a normal 3/8 thread & bushing.

The PEC pot would be a personal preference, IMO.

[AndyK]

Is there a reason why George likes the Rich mv over the LarMar?

[neikeel]

Is there a reason why George likes the Rich mv over the LarMar?

I guess you will have to ask him! The 'Rich Mod' does add a litle extra distortion of its own. I had it in a JMP50 and quite liked it, ideally I should try back to back.

[Hank S]

I have a Tweed Bandmaster 5E7 amp that I am attempting to adda ppimv but I have no sound. Using the layout I assume (cough) that it should be the same as this: http://forum.metroamp.com/download/file.php?id=17637 But I get no sound. I stole the second speaker output for my pot location and I'm just not sure what is wrong. I removed the 220K and I'm going to pin 5 on V4 and V5. I even moved these to pin 4 because I thought that maybe they should be before the resister.

Is there something different about this amp that makes it not a good MV choice? I have put one in a Marshall before and went quite easily.

[rockgod212]

well pin 4 would be part of your screen grid. so I think you have it wired wrong.

I have a Tweed Bandmaster 5E7 amp that I am attempting to adda ppimv but I have no sound. Using the layout I assume (cough) that it should be the same as this: http://forum.metroamp.com/download/file.php?id=17637 But I get no sound. I stole the second speaker output for my pot location and I'm just not sure what is wrong. I removed the 220K and I'm going to pin 5 on V4 and V5. I even moved these to pin 4 because I thought that maybe they should be before the resister.

Is there something different about this amp that makes it not a good MV choice? I have put one in a Marshall before and went quite easily.