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6N2P-EV vs 12AX7
6N2P-EV vs 12AX7
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Old 25th April 2018, 04:07 PM   #21
Lingwendil is offline Lingwendil  United States
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6N2P-EV vs 12AX7
The 6N2P has slightly lower plate resistance, and this will effect it's output impedance and therefore the frequency response when used in RIAA or other active filter stages when used in some circuits expecting to see a 12AX7.
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Last edited by Lingwendil; 25th April 2018 at 04:12 PM.
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Old 16th May 2018, 06:20 PM   #22
spaceistheplace is offline spaceistheplace
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6N2P-EV vs 12AX7
Default 6N2P-EV vs 12AX7

Thanks for that. My use case is in an RIAA stage as above.

I noticed some audible difference as I believe cyto mentioned (I didnít perceive it as good or bad necessarily- was a brief test), and wanted to understand why. I thought either just normal tube variance or my mind was playing tricks / I was victim of my own bias. But there seems to be some differences that have been discussed that could change real operating parameters.

Iím wondering how best to adapt a 12ax7 riaa stage for use with 6N2P.
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Last edited by spaceistheplace; 16th May 2018 at 06:29 PM.
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Old 16th May 2018, 06:27 PM   #23
kevinkr is offline kevinkr  United States
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6N2P-EV vs 12AX7
The answer is different depending on whether you are using passive EQ or EQ in a feedback loop.

For passive you will generally need to compensate for the change in rp unless it is very small and the network is insensitive to small variations in source impedance.

For feedback based EQ the situation will depend on the effect the substitution has on the overall closed loop gain, some minor changes to the design may address or adjustments to the feedback network may be required.
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