I copied this from a website, I hope this helps:
"Some "gurus" will tell you that an EL34, for example, needs around 40mA of bias. This is inaccurate information, because it doesn't take into account the class of operation, the output transformer primary impedance, or the plate voltages involved. For instance, an EL34, in class AB operation at 400V, with a 4K plate-to-plate primary impedance, would be biased at 40mA, while the same EL34 tube, used in a true class A circuit at 250V, might be biased at around 100mA."
8ohms is fine. 87db is low... However, this wont hurt the amp. All things being equal, higher efficiency is capable of better performance. High efficiency speakers also separate the men from the boys in terms of amp quality. Good sounding amps on low sensitivity speakers, often reveal their weaknesses on high sensitivity speakers. Low sensitivity speakers act like compressors. Shindo excels on high sensitivity.
Jonathan
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