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output of valve preamp showing a high voltage when turned on
output of valve preamp showing a high voltage when turned on
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Old 5th July 2020, 12:10 AM   #121
kodabmx is online now kodabmx  Canada
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output of valve preamp showing a high voltage when turned on
Why, too easy?
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Old 5th July 2020, 09:06 AM   #122
Merlinb is offline Merlinb  United Kingdom
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Quote:
Originally Posted by JMFahey View Post
Please look at how it works.
140V?
WHICH 140V?
Most JFETs cannot withstand more than 30V between gate and source/drain, but most tube preamps can deliver audio signals much larger than 30Vpk. Your circuit will work, but you still need to add protection Zeners (e.g. 2x15V in anti-series to ground) or your JFET will be destroyed if someone turns up the volume too high!
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