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Old 23rd April 2003, 01:49 PM   #1
karma is offline karma  Canada
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Red face a simple preamp with 5687 tubes

does anyone have a simple schematic what works with 5687 tubes. i got a few and im bored

u post it i make it
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Old 23rd April 2003, 02:27 PM   #2
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A 150H plate choke, 2uF output cap, two NiCds in the cathode, 150v DC from a choke input filter, 150k grid leak, 100ohm gridstopper. Partcount is lower than a gainclone
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Old 23rd April 2003, 02:40 PM   #3
arnoldc is offline arnoldc  Philippines
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Old 23rd April 2003, 08:44 PM   #4
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There are a few circuits for the 5687. Here is one I built using Magnaquest B7 transformers. It sounds excellent.
http://home.t-online.de/home/MHuber/pre-5687.htm
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