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12AU7 instead of 8416 - untested
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Vintage dave (talk | contribs) (12AU7 instead of 8416 - untested) |
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==ADAPTING TYPE 1S1 TO USE 12AU7 INSTEAD OF 8416== | |||
Untested. | |||
V183 is being used as a pair of cathode followers driving the plugin interface slowly, so it's not critical. | |||
After ensuring that pin 9 is no-connect, I think you can drop in a 12AU7 and shunt the heater with 400 ohms 1W. | |||
Grid current prohibits use of 12AT7. | |||
In my opinion, V44 has to remain 8416/12DJ8. High gm is required, along with no grid current, | |||
and there's no practical way to power a 6DJ8. So you can get a 1S1 down to one 8416 but not down to none. | |||
==David Wise 1S1 (S/N 002993) repair notes - August 2017== | ==David Wise 1S1 (S/N 002993) repair notes - August 2017== | ||