PPIMV in Rocket?

[dynaman]

Anybody try one? I'm itching to swap the 220Ks with a dual pot. How about a cross-line(?) MV, ala Matchless Spitfire/AC30?

[rooster]

dynaman - Just checking in to your post. Yes, I have installed the LarMar type PPIMV into 3 Rockets at this point and find that it works very well. The Matchless type MV is different, but also works well from my experience. If I hadn't run into the LarMar MV I would have tried the typical Matchless type MV.

I think the thing to consider is that - considering the sonic results - all MVs tend to sound 'best' when engaged slightly. Which is to say the sound we love is very typically the speakers getting beat up. Last comment by me is that the LarMAr type MV sounds better on any setting than the Airbrake.

[Cliff Schecht]

Like I said in the other thread, the PPIMV mentioned above works very well with the Rocket. TBH I even like it at extreme attenuation settings, it's relatively transparent even at super low volumes. But I use an SRO which doesn't have much speaker distortion to speak of, something to take into consideration.

[dynaman]

Ok, cool. I'm gonna try the PPIMV first.

Don't suppose anybody knows what MV is found in the Hayseed 30??

[rooster]

I had a Hayseed 30 over here one day about 3 years ago. The MV was not my focus but I am pretty sure there were no dual pots in that amp - and that's your answer. No, at the time, we did not really try that feature out.

I have heard the Matchless MV in Chieftains - I think identical - and they sound/sounded OK, FWIW. The friend who owned it sold it after 5 months, BTW. I thought it was an OK sounding amp, he paid $750 for it he said.

[angelodp]

I like it a lot. I was too cheap to get the 2.2M and had the 1.1m on hand.. hence the bracelet on the dual gang. I like the way i can get a maxed distortion with this. I also have the VVR for more controlled cleans and crunch.

Ange

[IMG:720:540]http://i260.photobucket.com/albums/ii9/ ... 3751-1.jpg[/img]

[IMG:720:540]http://i260.photobucket.com/albums/ii9/ ... 3746-1.jpg[/img]

[eddie25]

Ok, cool. I'm gonna try the PPIMV first.

Don't suppose anybody knows what MV is found in the Hayseed 30??

Check out the pics on the amp guts site, looks like a Type 2 to me, but not totally sure. I like the type 2/larmar a lot myself.

[paulster]

Short of an attenuator or power scaling, the LarMar should be the best type of master you can get on an AC30 or Rocket. It should work even better than on Marshalls because you won't get the NFB loop collapsing at low output levels and should retain the tone, subject to power tube distortion/linearity right down to the lowest levels.

[Ian444]

Interesting point Paul, I would never have thought of the effect on the NFB loop.

[amplifiednation]

Short of an attenuator or power scaling, the LarMar should be the best type of master you can get on an AC30 or Rocket. It should work even better than on Marshalls because you won't get the NFB loop collapsing at low output levels and should retain the tone, subject to power tube distortion/linearity right down to the lowest levels.

what exactly is meant by "larmar"?

[John_P_WI]

A few years ago Larry "Novosibir" and Mark "Rockstah" tweaked one of the PPIMV master volumes from the "Trainwreck" pages over on the Metro amp forum - for Marshalls mostly. This turned into a gazillion page thread and their two names were mashed together making it a LarMar master.

IIRC, KOC has something similar in his TUT book released in the 90's, back in the days before internet to the masses.....

[paulster]

That's about as succinct a summary as you can come up with. It's an improvement on a Ken Fischer design, so it's kind of apt to see it being used on a Rocket!

[dynaman]

[quote="rooster"]I had a Hayseed 30 over here one day about 3 years ago. The MV was not my focus but I am pretty sure there were no dual pots in that amp - and that's your answer.

Yeah, I just saw a random gut shot of the Hayseed and also noticed it did not use dual-gang pot.

I just ordered a VVR and plan on using it with the PPIMV.

[dynaman]

Short of an attenuator or power scaling, the LarMar should be the best type of master you can get on an AC30 or Rocket. It should work even better than on Marshalls because you won't get the NFB loop collapsing at low output levels and should retain the tone, subject to power tube distortion/linearity right down to the lowest levels.

Another "+" for the PPIMV.

[eddie25]

http://spinoo.free.fr/projetG5/Images%2 ... d%2030.jpg

Looks kinda like a Type 2 to me. They have a shot of another one that looks like it's on the back.