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-   -   If I change B+ do I have to change the circuit? (http://www.diyaudio.com/forums/tubes-valves/194853-if-i-change-b-do-i-have-change-circuit.html)

nige838 18th August 2011 09:48 AM

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

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 (Post 2676795)
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?


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