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Different way to achieve lower volume and retain tone.

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littlejac

Post subject:

Posted: Mon May 21, 2007 7:05 pm

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Joined: Tue Sep 19, 2006 11:46 am
Posts: 1078
Location: PA

What 's the dual ganged 250K pot do :?:

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pmurph1x

Post subject:

Posted: Mon May 21, 2007 9:04 pm

Joined: Thu Feb 09, 2006 2:44 am
Posts: 9
Location: Cherry Valley, IL

jac wrote:

What 's the dual ganged 250K pot do :?:

Here's a good tread that explains the mod in detail. Takes a while to get through it though:

http://forum.metroamp.com/viewtopic.php?t=4390

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LeeMo

Post subject:

Posted: Mon May 21, 2007 9:16 pm

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Joined: Thu May 19, 2005 12:41 pm
Posts: 148
Location: Mississippi

Wicksy,
For the EF86, you might also read here:
http://home.wanadoo.nl/jheijer/AC15.htm

LeeMo

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littlejac

Post subject:

Posted: Mon May 21, 2007 9:26 pm

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Joined: Tue Sep 19, 2006 11:46 am
Posts: 1078
Location: PA

Thanks both of you

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Wicksy

Post subject:

Posted: Tue May 22, 2007 7:52 am

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Joined: Sun May 20, 2007 2:53 pm
Posts: 75
Location: Halstead, Essex, UK

Cheers guys! That Metro thread is good. Larry has modified the Ken Fischer MV (basically a dual ganged 250K pot replacing the 220K grid feed resistors). I'm going to try installing it on my 18 watter and see what it does.

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Simon

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pmurph1x

Post subject:

Posted: Tue May 22, 2007 8:41 am

Joined: Thu Feb 09, 2006 2:44 am
Posts: 9
Location: Cherry Valley, IL

I'm going to give it a go myself. I have a feeling it will be disappointing for the normal channel though as you rely so much on slamming the power tubes to hear the magic.

Paul

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Wicksy

Post subject:

Posted: Tue May 22, 2007 12:34 pm

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Joined: Sun May 20, 2007 2:53 pm
Posts: 75
Location: Halstead, Essex, UK

Thats the problem, you'll never find a master volume that doesnt suck tone. I guess thats why NMV amps sound the best

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Simon

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zaphod

Post subject:

Posted: Tue May 22, 2007 1:48 pm

Expert

Joined: Sun May 20, 2007 1:45 pm
Posts: 1254
Location: YYZ

With an 18W, as most of the distortion is produced in the power amp, an MV will just make the amp sound cleaner as you turn it down. TMB 18Ws are different because they have more preamp and PI distortion, and an MV is actually some use with them.

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Great tones come in small glass jars!

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Wicksy

Post subject:

Posted: Tue May 22, 2007 4:41 pm

Novice

Joined: Sun May 20, 2007 2:53 pm
Posts: 75
Location: Halstead, Essex, UK

I must admit i've been fiddling with the amp a bit since installing the power dampener. I quite like it. I modded the amp to take EF86s which sounds quite nice. Using a strat i can get a nice just overdriven tone with relatively low volume. While it isnt as good a tone as it is bypassed, the amp sounds great. I think decent tubes help a fair bit. I'm curently running a Mullard EF86 in V1, a Mullard ECC83 in the PI and two Mullard EL84s in V3 and V4.

I really need to wait for neighbours to holiday so i can crank it. They go soon... :twisted:

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Simon

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