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Depends on the circuit

24.27.41.140

Triode_Kingdom

In Reply to: RE: 6SN7 Substitute for 5670 - Request Insights posted by svisner on June 20, 2024 at 10:51:58

I'll go against the consensus here (which I don't disagree with in a general sense) and say that it's possible a 6SN7 could work well in a circuit originally using a 5670. It all depends on the circuit configuration and component values. The thing is, there's more than one operating point that's likely to be satisfactory for a given tube type. If that wasn't true, manufacturers wouldn't provide multiple operating points in their data sheets, and every designer who wanted to use a specific tube would be hamstrung with a very specific set of parameters. The bottom line is that no one can answer your question intelligently without knowing the circuit it's used in.

Follow Ups:

Picture of Circuit Board - svisner 16:23:54 06/22/24 (3)
Image attached.
- Simpler problem - Chip647 11:31:44 06/27/24 (1)
  A 6SN7 is a fairly large tube compared to the stock tube and coupled with an adaptor on its base it is unlikely to fit in its chassis.
  
  On top of that, the tube is most likely just used as an output buffer/cathode follower which has very little impact on sound between tubes.
  - RE: Simpler problem - svisner 06:31:32 07/26/24 (0)
    It did fit, just.
- RE: Picture of Circuit Board - Triode_Kingdom 21:05:15 06/22/24 (0)
  Can't tell anything from that. It would require a schematic with component values and at least the plate supply voltage to make a reasonable determination.

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