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Old 18th August 2011, 09:48 AM   #1
nige838 is offline nige838  United States
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Default If I change B+ do I have to change the circuit?

If I change B+ do I have to change the circuit? I'm interested in lowering a plate volatge on a AX7 from around 275 down to 160-170 volts. should I worry about altering the circuit?

Thanks
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Old 18th August 2011, 10:07 AM   #2
DF96 is offline DF96  England
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Yes, although it depends on what the circuit is supposed to do. If a guitar FX box you will just get slightly different FX. If a hi-fi preamp you will get a bit less gain and a lot more distortion. 12AX7 like a high resistance in the anode circuit, which means either high HT/B+ or an active load.
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Old 18th August 2011, 11:00 AM   #3
nige838 is offline nige838  United States
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Quote:
Originally Posted by DF96 View Post
Yes, although it depends on what the circuit is supposed to do. If a guitar FX box you will just get slightly different FX. If a hi-fi preamp you will get a bit less gain and a lot more distortion. 12AX7 like a high resistance in the anode circuit, which means either high HT/B+ or an active load.
Thank you for your quick reply. would the changes be in the power supply or in the amplifier circuit?

thanks
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Old 18th August 2011, 11:16 AM   #4
DF96 is offline DF96  England
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In the circuit. Why do you want to power a circuit from the wrong voltage?
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