Lar/Mar MV tone problems

[Major Sparky]

Ok, so I built a 50 watt with materials from triode. Fired it up and everything is great. It sounds killer, and isn't too noisy either. I do have a minor issue with random feedback happening though, but that doesn't bother me now.

I decided to put in the Lar/Mar MV because I wasn't sure if I was going to shell out the money for an attenuator or power scaling. I read a lot of good reviews on here about that MV so I was hopeful that after having that installed my gain needs would be satisfied while I jammed at home. Well I've installed it and I'm running into a problem. Everything works right to my knowledge but it doesn't sound good. Whenever I use the MV the distortion sounds thin, farty, and kind of harsh. Is there anything I can do to tweak this? Maybe I didn't do something right?

[SteadyEddie]

Did you use shielded cable? Ground the shield at one end?

[Janglin_Jack]

Ok, so I built a 50 watt with materials from triode. Fired it up and everything is great. It sounds killer, and isn't too noisy either. I do have a minor issue with random feedback happening though, but that doesn't bother me now.

I decided to put in the Lar/Mar MV because I wasn't sure if I was going to shell out the money for an attenuator or power scaling. I read a lot of good reviews on here about that MV so I was hopeful that after having that installed my gain needs would be satisfied while I jammed at home. Well I've installed it and I'm running into a problem. Everything works right to my knowledge but it doesn't sound good. Whenever I use the MV the distortion sounds thin, farty, and kind of harsh. Is there anything I can do to tweak this? Maybe I didn't do something right?

Did you use the right value resistors nd dual concentric pot?

Mike

[Major Sparky]

Yes I'm sure I have the right values and I definitely used shielded cable. I got the parts from here, http://www.valvestorm.com/Amp%20Mods/LarMar" onclick="window.open(this.href);return false; and followed the layout here, http://metroamp.com/wiki/index.php/Lar/Mar_PPI-MV" onclick="window.open(this.href);return false;

[demonufo]

They're pretty good, but any post phase inverter master volume sounds pretty crappy when throttled right back. IMO, the only way to get a big amp down to acceptable home levels is to use a little of the PPIMV and a bit of attenuation.
But even then, the speakers aren't working hard enough...

[Major Sparky]

I knew I wasn't going to get great tones, but I didn't think it would sound this bad. Especially after hearing about other people getting good results.

[SteadyEddie]

Mine sounds great around halfway and still very good the rest of the way down to whisper volumes.

[Major Sparky]

Alright, I must have messed something up then. I'll go back and check over everything to make sure nothings misplaced.

[MacGaden]

Pictures would help...