General Discussion Forum - Voice The Sound In Your Head
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K, here's the real deal on these PR1 pots. The pot closet to the pre-amp tubes is a balance adjustment between the pairs of EL34's. The pot located under or next to the cooling fins of the trans is the bias adjustment. If you have a bias probe you'll want to check a tube on the left & on the right to insure a balance between the pairs. My Series One 100 is running @ 452 plate volts so I assume yours will be in that neighborhood also. I've got mine biased @ 38 mV but I think I'll back it down a bit to extend tube life.
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