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Thanks Paul,

Would it not be prudent to cut it down about 20%. Cutting at 90% will cut the tube life down significantly.

Yes, I normally cut at max. 12mA (say 66%). The resistor divider is more like a last resort to limit someone to go in with full power. Of course you can set that to a more appropriate value depending on your use case. With students and time pressure to finish things at the last moment, I can see your case 🙂

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