Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Dan The Man on May 22, 2016, 11:35:10 am

Title: Master volume mod - AC30
Post by: Dan The Man on May 22, 2016, 11:35:10 am

Please show me how I can add a master volume to my Vox AC30 TB. I have read you could bypass the cap at the cut control, but I'd prefer to keep the cut control as it is. Are there any other ways to install a MV? I have installed a couple of PPIMV's in Marshalls. Can I do a similar installation in an AC30?
I don't follow schematics so well, so if you have layouts or images that I can follow in detail I will be happy.

Thanks.
Dan

Title: Re: Master volume mod - AC30
Post by: sluckey on May 22, 2016, 12:12:01 pm

Try putting a jumper across your cut control cap. Then play with the pot to see if you like the crossline mv. If you like it, it's very easy to add. Look at this pdf. My brilliance control is the same as your cut control.

     http://sluckeyamps.com/lightning/matchless_lightning.pdf (http://sluckeyamps.com/lightning/matchless_lightning.pdf)

There are some others that I like better. Search for LarMar master volume.

Title: Re: Master volume mod - AC30
Post by: Dan The Man on May 22, 2016, 02:01:31 pm

Thanks! But then I don't have the cut control anymore.

Title: Re: Master volume mod - AC30
Post by: sluckey on May 22, 2016, 02:08:58 pm

This is just temporary to see if you like it without having to actually add the mv. If you like it then add it and you will have your cut and mv.

Title: Re: Master volume mod - AC30
Post by: shooter on May 22, 2016, 07:22:36 pm

Quote

My brilliance control

Can I ask, do you like the brilliance control, I copied/used the clubman's PA section, but it seems to loose something tonally?  Thx, sorry for the hi-jack

Title: Re: Master volume mod - AC30
Post by: sluckey on May 22, 2016, 08:17:33 pm

I never bonded with that Matchless Lightning amp. I thought that crossline MV really sucked. I just couldn't get used to it. The Lightning became a donor for the AC-15. The brilliance control is now called a top cut control and I like it pretty good. In fact, I think it's necessary for the AC-15, which really has no tone controls.

Title: Re: Master volume mod - AC30
Post by: HotBluePlates on May 22, 2016, 08:52:39 pm

Quote from: shooter on May 22, 2016, 07:22:36 pm

Can I ask, do you like the brilliance control, I copied/used the clubman's PA section, but it seems to loose something tonally?

I thought, "Yeah, the treble," when I read this.  :l2:

I use the same control in my 25L15-type amp. You may have to tailor the pot and/or cap values to adjust the circuit to your amp. I felt it would be a necessity with a D-130 and its aluminum dust cap. Sometimes I engage it, sometimes not, depending on the guitar and other control settings.

Title: Re: Master volume mod - AC30
Post by: shooter on May 23, 2016, 08:50:52 am

Quote

I never bonded with that Matchless Lightning amp

I love my *plexi*-clubman, tonally it's my best sound so far, but the brilliance knob seems to *gut* most of the good tone in favor of low volume.  Thanks for the info