NOS 2A3 or Sophia 300b 2.5v in Opers Consonance Cyber 30?

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I picked up an Opera Conance Cyber 30 2A3 SET amp to use as a headphone amp. Aside from a very slight hum (that is not noticeable when music is playing) it sounds nice with my Grado GS1000i headphones. I am currently using an RCA ECC83 driver and Sovtek 2A3's in it but would like to try upgrading the power tubes. The two tubes I have been looking at mostly are the RCA double black plate and the Sophia Electric Princess 300b 2.5V. I am new to this so I would welcome any input or suggestions from you experts.

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Topic - NOS 2A3 or Sophia 300b 2.5v in Opers Consonance Cyber 30? - epetrillo 08:28:47 02/02/12 (4)

Can you really use 300B tubes? - Frihed89 16:20:36 02/02/12 (2)

RE: Can you really use 300B tubes? - epetrillo 18:24:23 02/02/12 (1)

Interesting...thanks...I'll have a look nt - Frihed89 22:19:12 02/02/12 (0)

Two choices... - drlowmu 14:50:46 02/02/12 (0)

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