Re: [Harp-L] Re: The Mission Chicago 32-20 harp amp


Jim is just asking for a demo. I see no issue in Bruce recommending a tube 
rectifier as his preference, if the amp takes a tube rectifier, then owners who 
want to try the Weber copper cap can do so, in conjuction with a bias adjustment 
(if required).

A tube and  copper cap usually sound different because the sag in a tube 
rectifier has a more dynamic component, however there are many great sounding 
harp amps that use SS/Weber CC rectifiers. SS diodes are "vintage" technology  & 
used in great sounding vintage amps, whichever type of rectifier you want to use 
comes down to personal preference. Tubes of the same type from different 
manufacturers also have slightly different characteristics & often sound 
different to each other.

From: Rick Davis <bluesharpamps@xxxxxxxxx>
To: harp-l@xxxxxxxxxx
Sent: Saturday, 11 December, 2010 21:43:30
Subject: [Harp-L] Re: The Mission Chicago 32-20 harp amp

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:

-Rick Davis
The Blues Harp Amps Blog

On Sat, Dec 11, 2010 at 2:12 PM, Jim Rossen <jimjimdr@xxxxxxxxx> wrote:

> Rick-  It would be great to hear the difference you describe between a
> Copper Cap and tube recto in the Mission Chicago.  Can you do a video
> of your playing to demonstrate this?
> Jim

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