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In Reply to: RE: replace 12au7 with 5687 in border patrol pre posted by Philmoses on December 05, 2021 at 03:46:03
The pin outs of the two tubes are very different, so no, not interchangeable.
Follow Ups:
Thanks for the reply.
Are they similar enough to swap the pin connections and use as a replacement?
Or is that...how long is a piece of string?
Thanks.
The 5687 draws three times the heater current vs. the 12au7.
The plate resistance is a lot different. The 5687 is 1500 to 3000 depending on operating point and the 12aut is 6500 to 7700 depending on operating point.
The transconductance is different. 11.5k to 5.4k for the 5687 depending on operating point vs. 3.1k to 2.2k for the 12au7.
To use a 5687 in a circuit designed for a 12au7 a lot of changes would have to be made.
A 6cg7 would be a much better fit.
Tre'
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