Wednesday, September 14, 2016
Jen Harmon Booster
Here's a really unique overdrive from the Italian manufacturer Jen from the late 70s. Think Tube Screamer meets Big Muff. It sort of reminds me of a DBA design (only more stable and not as over the top) with a whole mess of transistor stages pushing a BMP style tone stack. Originals used BC318c transistors, but others in the 400-500 hfe range can be used. Here's the schematic for reference.
Hi Pedal Builders! I'm really interested in this pedal. Could you please tell me some advice about the transistor? I would like to use BC549B. Thanks in advance!
ReplyDeleteIf you look at the datasheet of the BC549B the hfe ranges from 240 to 500, but typically around 330. So measure what you have to see if they fall in the 400-500 range described above. But really, just use sockets for the transistors and try different ones out. See what sounds best to you.
DeleteHow about 2n5089's hfe range around 550?
ReplyDeleteverified, used 2n5088! Sounds like a Typical Fuzz.
ReplyDeleteThanks for verifying!
DeleteHello, any chances you have the schematic?
ReplyDeleteCheers
Benoit
http://3.bp.blogspot.com/-zYpx4o18GFM/T14JMWZ6bVI/AAAAAAAABEs/7XlSDFcRJIQ/s1600/Jen_Gretsch_Harmon_Booster_Schematic.jpg
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