[Harp-L] Re: Mission amp and Copper plug ins

[Michael Easton <diachrome@xxxxxxxxxxx>]

Gary gives us Avenger owners both the copper plug in and the tube  
rectifier.

I was amazed at the subtle yet noticeable underlining difference  
between the two.  The Avenger came with the Copper installed.

I tried that for a few days then tried the tube rectifier.  I switched  
back to the copper because I could get cleaner separation of the eq's.

I think the  noticeable difference to my ears is the cooper tube tends  
to keep the eq's separated more whereas the glass tube tends to allow  
some bottom to bleed into the mids and highs almost acting
like a filter.  I guess it didn't matter much when the bass, treble  
and mids were controlled by one knob on vintage amps.
Now that separating the tone controls are the norm adding the tube  
rectifier can allow you to dial in more like a single tone knob where  
there is always some
bottom or "warmth"  in the mix.

Mike




On Dec 11, 2010, at 8:35 PM, harp-l-request@xxxxxxxxxx wrote:

> Message: 8
> Date: Sat, 11 Dec 2010 16:14:18 -0800 (PST)
> From: Jim Rossen <jimjimdr@xxxxxxxxx>
> Subject: [Harp-L] Re: The Mission Chicago 32-20 harp amp
> To: harp-l@xxxxxxxxxx
> Message-ID:
> 	<a04e49e3-7aef-47eb-806a-a1ff1e46e260@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1
>
>
> Rick-  I think the discussion has been- sonic difference between a
> tube rectifier and the Weber Copper Cap rectifier intended to emulate
> that particular tube rectifier.  I was hoping for a demonstration of
> the sonic difference you noted between these devices.   This is a
> separate question from a comparison between a tube rectifier and a
> solid state rectifier that has no emulation of tube characteristics-
> I agree this difference is easily heard.
>
>
> Jim
>
>
> On Dec 11, 3:43 pm, Rick Davis <bluesharpa...@xxxxxxxxx> wrote:
> > Jim, are you suggesting there are NO sonic differences between a  
> > solid state
> > rectifier and a tube rectifier?  If so, that is rather astounding.
> >
> > The differeces are well-known.  As Gary Onofrio said, the copper  
> > plug-in
> > solid state rectifier makes an amp seem slightly louder and more  
> > crisp, and
> > that is exactly what I hear with these rectos.  The problem is,  
> > crisp is the
> > opposite of sag, and the tone we were looking for in the Mission  
> > Chicago
> > 32-20 amp was an authentic vintage warmth.
> >
> > We nailed it.  The amp sounds great.  I invite you to listen to the  
> > sound
> > samples at the Mission Harp Amp website:  www.missionharpamps.com.
> >
> > --
> > -Rick Davis
> > The Blues Harp Amps Bloghttp://www.bluesharpamps.blogspot.com/

Michael Easton
www.harmonicarepair.com