Hi,
I'm using a power MOSFET, 2SK3675, to create a variable B+ supply for my tube amp. I've had the circuit in before, working great, but caused it to fail by 'chopsticking' to find a problem, leading to the MOSFET shorting to chassis. I believe the cause of failure was the insulator I used (Radio Shack......) was too small for the device, which rotated just slightly and made contact.
Does anyone know of a US supplier that might have either a larger size mica insulator, or even better, 'generic' insulating material that I could use? The voltages involved may be assumed to be in the realm of 400VDC. I've read about a dielectric paper used in some 'vintage' designs, is that stuff good for this purpose?
Thanks!
~Mike
I'm using a power MOSFET, 2SK3675, to create a variable B+ supply for my tube amp. I've had the circuit in before, working great, but caused it to fail by 'chopsticking' to find a problem, leading to the MOSFET shorting to chassis. I believe the cause of failure was the insulator I used (Radio Shack......) was too small for the device, which rotated just slightly and made contact.
Does anyone know of a US supplier that might have either a larger size mica insulator, or even better, 'generic' insulating material that I could use? The voltages involved may be assumed to be in the realm of 400VDC. I've read about a dielectric paper used in some 'vintage' designs, is that stuff good for this purpose?
Thanks!
~Mike