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In Reply to: RE: 6SN7 circuit posted by Tube747 on March 25, 2017 at 04:33:16
The 6SN7 is a linearity champion. There's more than 1 good way to exploit that linearity.
The cathode coupled (LTP) hybrid design I'm uploading is non-inverting and comparatively low gain. Given today's 2 VRMS digital sources, lowish gain is a definite plus. The O/P impedance of the setup is below 100 Ω, without resorting to costly step down transformers.
low gain? How low? Less than 10db?
I said comparatively low gain. The max. theoretical gain for a 1 grid driven LTP is μ/2. 6SN7 μ = 20. As drawn, the hybrid exhibits approx. 17 dB. of gain. If that's too much, lift the non-inverting grid's stopper from ground and connect it to a tap on the 1 Mohm resistance across the O/P jack. That portion of the resistance between the "hot" O/P and tap should be non-inductive. Meter matched carbon comp. parts (for good channel to channel balance) is the cost effective method, but (naturally) Mills NIWW or Caddock film are the "super/duper" way.
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