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RE: 6SN7 Substitute for 5670 - Request Insights

The 5670 is a high quality modern tube released about 1955 and made by many of the best tube producers such as Tung Sol, RCA, Ericson (2C51) and Western Electric (396A). It has a different plate resistance, transconductance and amplification factor than the 6J5/6SN7; a higher performing tube with much greater transconductance and lower plate resistance.

As such, the 5670 has very different operating points, so that a 6SN7 plugged into a circuit (with an adapter) intended for a 5670, will give very unsatisfactory performance. So any competently engineered circuit using the 5670 should be very high quality. It would be a mistake to seriously degrade the performance by inserting the wrong tube.

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