From no_spam_pleas–(at)–n_a_diet.com Wed May 27 16:18:34 CDT 1998
Article: 107270 of alt.guitar.amps
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From: Dutch
Newsgroups: alt.guitar.amps
Subject: Re: improving a silverface Princeton
Date: Wed, 27 May 1998 14:02:46 -0700
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Xref: geraldo.cc.utexas.edu alt.guitar.amps:107270
Tremolux wrote:
> Anyway, if you move the B+ feed for the phase inverter one notch higher on the
> power supply voltage divider chain, you solve the phase inverter headroom
> problem. Why Fender never did this I can’t figure.
You have to watch out for the heater-cathode voltage. The max DC
portion of this for a 12AX7 is about 100VDC. So, if the cathode’s much
above 100V, you could be running into trouble. The Schematic claims
about 65V on the cathode, which means you’ve got /some/ room to go up.
Just measure it after you move the wire, and if it’s less than 100V,
you’re golden!
Dutch
From tremolu–(at)–ol.com Wed May 27 19:30:50 CDT 1998
Article: 107288 of alt.guitar.amps
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From: tremolu–(at)–ol.com (Tremolux)
Newsgroups: alt.guitar.amps
Subject: Re: improving a silverface Princeton
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>You have to watch out for the heater-cathode voltage.
Been there, done that. Not an issue in this application.
