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Post subject: white knob princeton
Posted: Mon Nov 07, 2011 11:02 am
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Do the white knob and later blackface Princetons break up like the brown, or do they stay clean like the non reverb silverfaces?


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Post subject: Re: white knob princeton
Posted: Mon Nov 07, 2011 11:43 am
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The "white knob" 6G2 Princeton chassis is identical to the earlier brownface amp, with the same cathode-follower tone stack. The AA764 blackface Princeton is virtually the same as the later silverface versions save for the change from a GZ34 rectifier to a 5U4GB in 1970 (the AA1270 revision).

HTH

Arjay

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Post subject: Re: white knob princeton
Posted: Mon Nov 07, 2011 12:51 pm
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I think I've read somewhere that Billy Gibbons recorded the first ZZ Top albums with a brown Princeton, so if that's the case they can get nice and gritty


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Post subject: Re: white knob princeton
Posted: Mon Nov 07, 2011 3:15 pm
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The "reverend" is fond of preaching. I take everything he says with an incredulous grain or two of salt since I'm not a member of his "flock".

The 6G2 does overdrive more quickly than the AA764 -- the even-order harmonics develop more quickly which help to drive the output stage into saturated compression much sooner than a blackface Princeton. The single-control tone stack is a limiting factor though.

Arjay

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Post subject: Re: white knob princeton
Posted: Mon Nov 07, 2011 3:19 pm
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My experience with 6G2 circuits is they run a LOT less global feedback (56K-ohms) and a 5Y3GT rectifier. This puts less voltage onto the all the tubes. And the lower feedback allows for earlier harmonic distortion. So, these amps tend to have a "browner" tone and slower onset of OD. More creamy tone. Esp with an alnico speaker.

6G2:
http://www.webphix.com/schematic%20heav ... _schem.pdf

As Arjay said, the AA964 or AB763 ran higher voltage output GZ34 or 5U4GB rectifiers. Thus higher voltages onto the plates of the tubes. Plus more voltage in the feedback (2700-ohm)-- more global feedback. This circuit makes for a tighter sound. A more defined bass-midrange transition. Slightly cleaner tone to breakup.


AA964:
http://www.webphix.com/schematic%20heav ... _schem.pdf


Should be said, both amps run 6V6GT tubes. These puppies lend a character and tone all their own. In any amp they TEND to breakup smoother than, say 6L6GC. They have a richer midrange. And maybe rolled-off top end. Not the clean high notes of a good 6L6GC. PLus, output is about 40% less than the 6L6GC.


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Post subject: Re: white knob princeton
Posted: Mon Nov 07, 2011 6:44 pm
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Here's my '62 Princeton,it's probably got the best midrange slide tone of any amp I have,but it usually only gets played at home.
Image


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Post subject: Re: white knob princeton
Posted: Mon Nov 07, 2011 8:07 pm
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She shore is purdy, Bubba!

8)

Arjay

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Post subject: Re: white knob princeton
Posted: Tue Nov 08, 2011 12:07 pm
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Thanks RJ....she is a cool little amp,a good one for recording.


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Post subject: Re: white knob princeton
Posted: Tue Nov 08, 2011 12:13 pm
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Rebelsoul wrote:
Thanks RJ....she is a cool little amp,a good one for recording.


I use my '65 Princeton Reverb primarily for the same purpose. They're very "engineer-friendly".

8)

Rawk on!

Arjay

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Post subject: Re: white knob princeton
Posted: Tue Nov 08, 2011 5:08 pm
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Reb...That is one very fine porch weasel there and an amazingly clean one :!: :!: :!: Not suprised you use it for slide, I bet it is a tone to die for!

T2

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