If I change B+ do I have to change the circuit?

nige838 · 18th August 2011, 09:48 AM

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

DF96 · 18th August 2011, 10:07 AM

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.

nige838 · 18th August 2011, 11:00 AM

Quote:

Originally Posted by DF96

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

DF96 · 18th August 2011, 11:16 AM

In the circuit. Why do you want to power a circuit from the wrong voltage?

18th August 2011, 09:48 AM	#1
nige838 diyAudio Member Join Date: Dec 2009	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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18th August 2011, 10:07 AM	#2
DF96 diyAudio Member Join Date: May 2007	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.

18th August 2011, 11:16 AM	#4
DF96 diyAudio Member Join Date: May 2007	In the circuit. Why do you want to power a circuit from the wrong voltage?

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