PPI Master Volume or Power Scaling?

[loudthud]

I'm buying a new car in Jan. a 2010 CLK-350

Now it all makes sense.

[big_teee]

I'm not Sure We're Still Even, on JMAFs Location: Earth!

[Wombaticus]

Now it all makes sense.

Not quite yet. I think it's still a toss-up between narcissistic personality disorder and borderline personality disorder... A few more data points are required.

[Chuck H]

When in Gary's position in the discussion, what sort of personality disorder suddenly prompts someone to come off with:

I'm getting a new car, and your presumably not, neener, neener, neener.

I'm still confused.

[big_teee]

I'm All for Cutting the Guy Some Slack!
Tis the Season to Be Jolly!
Merry, and Happy!
T

[Jazz P Bass]

[QUOTE=Chuck H;241623] suddenly prompts someone to come off with:

I'm getting a new car, and your presumably not, neener, neener, neener.

QUOTE]
I got a new bike for Christmas.
A 26" Pacific with 18 gears. neener neener neener!

[hasserl]

I believe that to get the best performance from power scaling you still want to use a master volume, as it helps to be able to attenuate the signal fed to the power tubes when you've reduced the voltage. So, if you have to do just one I'd just go with the MV, if you can do both go for it.

[JoeM]

I'm All for Cutting the Guy Some Slack!
Tis the Season to Be Jolly!
Merry, and Happy!
T

Yeah, it's getting a little old.

[Chuck H]

A new car or a new bike, neeners are understandable. I'd sooner have a new guitar... Or peace on Earth... Prioritized in that order, of course.

[leadfootdriver]

I believe that to get the best performance from power scaling you still want to use a master volume, as it helps to be able to attenuate the signal fed to the power tubes when you've reduced the voltage. So, if you have to do just one I'd just go with the MV, if you can do both go for it.

That's what the directions of dudemans VVR said, to use both so you can limit the signal on the VVR power section to keep it from clipping.

But what I don't understand is, why don't I want the power tubes to clip if I'm going to VVR the power section? That seems to be the point of the whole thing. I guess it probably sounds like ass that way, eh?

[pdf64]

'why don't I want the power tubes to clip if I'm going to VVR the power section? That seems to be the point of the whole thing. I guess it probably sounds like ass that way, eh?'
In general you do want the power tubes to clip/overdrive, but the drive to them may need to be limited to keep the ratio between the overdrive in the various stages. If one stage is overdriven massively, blocking distortion can become significant and yes, that does sound like ass.

[big_teee]

'why don't I want the power tubes to clip if I'm going to VVR the power section? That seems to be the point of the whole thing. I guess it probably sounds like ass that way, eh?'
In general you do want the power tubes to clip/overdrive, but the drive to them may need to be limited to keep the ratio between the overdrive in the various stages. If one stage is overdriven massively, blocking distortion can become significant and yes, that does sound like ass.

If you haven't tried the Lar/Mar PPIMV, You should!
Just so You know what your missing.
I will not have another big Amp without it.
T

[hasserl]

So called LarMar MV is a so called Ken Fisher MV (do a search for the Trainwreck Pages, see the type 2 MV) with bypass resistors added to maintain bias voltage to power tube grids in case the pot wiper looses continuity. I don't know how it got the name LarMar, but that concept was kicked around years before there was any LarMar.

[big_teee]

So called LarMar MV is a so called Ken Fisher MV (do a search for the Trainwreck Pages, see the type 2 MV) with bypass resistors added to maintain bias voltage to power tube grids in case the pot wiper looses continuity. I don't know how it got the name LarMar, but that concept was kicked around years before there was any LarMar.

I don't think it matters what we call it, but I like it.
The version everyone is calling the Lar/Mar is from the Metro Forum.
Lar/Mar PPI-MV - MetroAmp Wiki
Ken isn't here to defend himself!
T

[hasserl]

Metro, schmetro. Just another Johnny-come-lately amp forum?

LarMar just sounds odd, why not give credit to one of the masters? Who the hell is LarMar anyway? And why should we care?

Sorry, just being a curmudgeon. It happens when you get old.