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Old 4th September 2015, 09:09 AM   #1
diyAudio Member
Join Date: Sep 2011
Default Hissing problem of a hybrid amp

I have layouted and built an amp according to the Project Ember http://www.mediafire.com/view/6l80ri...schematic_.pdf with some modification: no auto heater selector, using a 24V AC and regulated using LM317 to 30V, added class A bias for the opamp. It sound fine but i got hiss in one channel: IC3 or the opamp on the left of the picture, the hiss change with tube but not the volume level. At first, i used an external LM2596 for the heater and there is no hiss then i install the onboard heater and hiss appeared so i think it must be some layout prolem. Please take a look at my layout and give me some suggestion, i also attached the eagle layout. Thanks!

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Old Yesterday, 03:39 AM   #2
diyAudio Member
Join Date: Apr 2014
Location: Farmington, Michigan
Why not email Jeremy at Garage1217 directly, he and Franz designed the amp, and they have been very helpful with me .
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