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1st March 2010, 02:16 PM
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diyAudio Member
Join Date: Jun 2006
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ECC88 Shield
Hi,
I am in the process of designing a preamp with ECC88 tubes on a pcb, with extended bandwidth. I have two options of grounding the tube shield (pin 9). I can do this on the pcb; trace it to the pcb's ground-plane, and secondly; screw it down through the pcb to the chassis. The ground-plane on the pcb and the chassis are wired together, thus are electronically one. Some say it does not make a difference, others say grounding to chassis is better to minimize RF pickup. ECC88 are high frequency devices, so any concerns are present, as I will try to minimize high frequency filtering. Does anyone have experience with this. Cheers |
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