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

novosibir · Post by **novosibir** » Fri Nov 10, 2006 4:58 pm

rockstah wrote:yes 20k?

I'm shure, that no brand of output tubes that huge difference ever will notice

Larry

rockstah · Post by **rockstah** » Fri Nov 10, 2006 4:58 pm

novosibir wrote:
rockstah wrote:yes 20k?
I'm shure, that no brand of output tubes that huge difference ever will notice

Larry

thank you Larry!

pongo316 · Post by **pongo316** » Fri Nov 10, 2006 5:05 pm

rockstah wrote:
pongo316 wrote:Mark Whats your thoughts on this vesion compared to the previous ones used ???
did u hear the clip? this one blows away the other one tried. hands down. end of story.

Yes I did hear the clip.

It sounded awsome as usual (no suppises there

)

What's it sound like when you open her up a bit more (have you had the chance to do that yet)

As I have tried the other version but not that impressed ( but your clips with the eralier version sounded great too)

Whats that (orange)cap sitting on top of the .68 mustard ?

Did I miss some thing ?

rockstah · Post by **rockstah** » Fri Nov 10, 2006 5:08 pm

pongo316 wrote:
rockstah wrote:
pongo316 wrote:Mark Whats your thoughts on this vesion compared to the previous ones used ???
did u hear the clip? this one blows away the other one tried. hands down. end of story.
Yes I did hear the clip.

It sounded awsome as usual (no suppises there )

What's it sound like when you open her up a bit more (have you had the chance to do that yet)

As I have tried the other version but not that impressed ( but your clips with the eralier version sounded great too)

Whats that (orange)cap sitting on top of the .68 mustard ?

Did I miss some thing ?

this master sounds way better - WAY BETTER

you see the .68u across v2a cathode resistor? i put a 330u cap in parralell with the .68.

u wont notice the difference of this and just a 330u on v2a's cathode resistor. it adds up to be 330.68u

rtcook · Post by **rtcook** » Fri Nov 10, 2006 9:59 pm

Mark/Larry,

Just to clarify, what is the minimun acceptable wattage for the 2.2M resistor? Carbon film, carbon comp, metal or doesn't it matter? How about the pot? .5, 1 or 2W? Carbon tracking?

Thanks again,

Roger

rockstah · Post by **rockstah** » Fri Nov 10, 2006 10:23 pm

rtcook wrote:Mark/Larry,

Just to clarify, what is the minimun acceptable wattage for the 2.2M resistor? Carbon film, carbon comp, metal or doesn't it matter? How about the pot? .5, 1 or 2W? Carbon tracking?

Thanks again,

Roger

i believe larry said u could use even 1/4 cabon film. (u can find thosee at radio shack).for this position - perhaps read previous pages. but im pretty sure.

rtcook · Post by **rtcook** » Fri Nov 10, 2006 10:28 pm

Mark,

Well, we'll see if Larry chimes in on this.

I was just listening to your clip again. Amazing! I take it that is your 12000 series amp? I'm curious how this will work in my 69 setup. Not quite the same as the 12000 series. Which reminds me, I need to work on that amp, too. I have too many irons in the fire.

Roger

rockstah · Post by **rockstah** » Fri Nov 10, 2006 10:47 pm

rtcook wrote:Mark,

Well, we'll see if Larry chimes in on this.

I was just listening to your clip again. Amazing! I take it that is your 12000 series amp? I'm curious how this will work in my 69 setup. Not quite the same as the 12000 series. Which reminds me, I need to work on that amp, too. I have too many irons in the fire.

Roger

its basicaly a 69 spec with .1u in the output couplers. alway sbeen my fav spec too.

novosibir · Post by **novosibir** » Fri Nov 10, 2006 11:58 pm

rtcook wrote:Just to clarify, what is the minimun acceptable wattage for the 2.2M resistor? Carbon film, carbon comp, metal or doesn't it matter? How about the pot? .5, 1 or 2W? Carbon tracking?

There's nearly no current flowing through the pot and through the resistor, therefore:

- for the resistors ones with a power capability of 1/8W are already overkill - and no matter which type. You can use CC's CF's or MF's

- for the pot the usual Mouser's with a power capability of .25W (log) or .5W (lin) also are plenty

And because we don't buildt HiFi equipment and even won't achieve the sterility of those, we may ignore a difference of the two sections of the pot up to about 10% - so if you got a 250K double pot with 235K/255K, no problem - it will work fine, because a certain imbalance is adding an extra amount of the harmonic K2 to the tone and makes it a tad juicier

Larry

rockstah · Post by **rockstah** » Sat Nov 11, 2006 12:03 am

novosibir wrote:
rtcook wrote:Just to clarify, what is the minimun acceptable wattage for the 2.2M resistor? Carbon film, carbon comp, metal or doesn't it matter? How about the pot? .5, 1 or 2W? Carbon tracking?
There's nearly no current flowing through the pot and through the resistor, therefore:

- for the resistors ones with a power capability of 1/8W are already overkill - and no matter which type. You can use CC's CF's or MF's

- for the pot the usual Mouser's with a power capability of .25W (log) or .5W (lin) also are plenty

And because we don't buildt HiFi equipment and even won't achieve the sterility of those, we may ignore a difference of the two sections of the pot up to about 10% - so if you got a 250K double pot with 235K/255K, no problem - it will work fine, because a certain imbalance is adding an extra amount of the harmonic K2 to the tone and makes it a tad juicier

Larry

interesting about the K2.

rtcook · Post by **rtcook** » Sat Nov 11, 2006 12:16 am

Love this place! Just a wealth of information.

Thanks for the clarification Larry. I'm ready to incorporate this PPIMV (Larry's PPIMV or is it Mark's PPIMV?). How about the LarMar PPIMV?

Roger

rockstah · Post by **rockstah** » Sat Nov 11, 2006 12:36 am

rtcook wrote:Love this place! Just a wealth of information.

Thanks for the clarification Larry. I'm ready to incorporate this PPIMV (Larry's PPIMV or is it Mark's PPIMV?). How about the LarMar PPIMV?

Roger

how about we call it "the based on Ken Fishers master volume type 2 that novosibir has been using in his builds for ever that rockstah discovered in the trainwreck pages in Gerald Webers book "a desktop reference of hip vintage guitar amps" that novosibir not only shared his wisdom to make this mod safe as well as supervised and made sure it was done right as rockstah installed it into his plexi build to discover it was the best master volume mod "

or.. we could just call it "The Metro-Army Post Phase Inverter Master Volume"

pongo316 · Post by **pongo316** » Sat Nov 11, 2006 2:08 am

How about naming it the

KFC

Ken Fishers Cool (PPIMV)

Mark , Larry , and every body else involed.

A BIGthank you

MacGaden · Post by **MacGaden** » Sat Nov 11, 2006 3:32 am

But: Why should these extra resistors affect the sound ? Are

novosibir · Post by **novosibir** » Sat Nov 11, 2006 9:14 am

Why not simply: Master Volume "Type-5" - the type, Ken Fischer forgot

Larry