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

[Hank S]

It was a passing attempt at making the bugger work.

So pin 5 but I guess I doing my best with the layout and I have done it correctly before on a Marshall.

My bigger question is if the PPIMV is wired the same on the Tweed Bandmaster as it would be on a 50 watt Plexi?

Or should I use a different approach to MV on the Tweed Bandmaster?

[rockgod212]

they should be the same. you said you wired the ppimv to pin 4 of power sockets, your bias voltage goes to the grid ressitors on pin 5, pin 4 is your screen grids. you should find a schematic of your amp and compare the two.

It was a passing attempt at making the bugger work.

So pin 5 but I guess I doing my best with the layout and I have done it correctly before on a Marshall.

My bigger question is if the PPIMV is wired the same on the Tweed Bandmaster as it would be on a 50 watt Plexi?

Or should I use a different approach to MV on the Tweed Bandmaster?

[Hank S]

I am back to pin 5 but I think there must be something I did while removing the extra jack

[rockgod212]

I don't know then. retrace your work or post some pics.

[CoffeeTones]

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.

That layout is awful quality. This is less cluttered http://www.ceriatone.com/images/mods/Type-2-MV.jpg

[rockgod212]

just checked out that layout, yeah that's a bit messed up n cluttered

[dkarr]

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.

I have the Rich Mod II in my 1969 Super Lead and I absolutely love it. Great response and decent transparency, I see why George prefers this version.

However, I'm sort of curious what you mean by "the rich mod does add a little extra distortion"? I was under the impression that this mod was rather non-intrusive and was basically out of the circuit when at full volume. How could it "add gain"?

[Hank S]

Okay, stop me if you've heard this one. You go crazy trying to figure out what you've done wrong doing a mod and then put the amp back to where you started and it just fereeeking doesn't work. Then you check the tubes under the tube covers and see one has a hazy foggy look to the glass.



So I change the tube and the amp works. So now let me try this again….

[CoffeeTones]

Remove the covers and store them. The amp will sound better and you can see the tubes. Was it the phase inverter tube?

[Hank S]

It was V2 a Mullard reissue

So, I installed the ppimv and it works!

I'll have to wait to really feel it out later today. Mostly I want a bit fuller sound at lower volume. I'm going to reinstall my 1973 Traynor alnico speaker that is warm and inefficient.

[CoffeeTones]

Elevate the heaters and V2 tubes should last longer - even the cheap ones.

[Thiez]

Remove the covers and store them. The amp will sound better

Why is that? I also have covers on my tubes, so curious why they sound better without.

[CoffeeTones]

They change the internal capacitance of the tube.

[dkarr]

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.

I'm confused on this comment. How does the Rich Mod add "extra distortion"? I have this PPIMV on my Super Lead and I love it. But to me it's just the same tone I get with the amp cranked. I don't notice any "extra" gain.

Could you elaborate on this comment?

[Thiez]

Allright, so a little bit less bit when tube covers are on?