Tuesday, September 11, 2018
Sunn 200S Preamp
Here's a simple bass preamp circuit derived from the Sunn 200S using JFETs. It's pretty similar to the Bassman Preamp, but with the EQ section at the end of the circuit instead of the middle. Original S200S amps didn't have the Mid control, but it's kind of necessary IMHO. Bias the JFETs to 4.5v and adjust to taste. Not sure if the BAT85 diodes are necessary as they're not in the Bassman Pre, but I left them in just in case. Also not 100% sure if the below demo follows this schematic exactly, but it should be in the ballpark. Should fit nicely in a 1590B.
Hello!! good job!!! I will try to do it for a friend who plays bass. When will we see a sunn model t preamp? I do not have stripboards to do the tagboardeffects. regards!
ReplyDeleteGreat one!
ReplyDeleteDoes anyone know if this would work as an acoustic guitar preamp?
ReplyDeleteYes, it will
Delete👍
DeleteI guess you can count this as verified, I did this today in the morning and it works. I skipped the BAT85 diodes though.
ReplyDeleteAwesome. Thanks for verifying and commenting about the diodes. Didn't think they were necessary.
DeleteMay as well add the Sunn model T preamp:)))
ReplyDeleteBowie style. Verified. Excellent. bat85 onboard. Thanks!
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ReplyDeleteHi, I'm looking for a cabinet simulator with an equalizer, a preamp ... is it good for me to use when playing without an amplifier on a mixer pad?
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ReplyDeleteFWIW I did this build with 1n60 instead of BAT85, and it worked and sounded great.
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