Fan Shroud for Heathkit SB-220 Amplifier

thingiverse

!!!--- Before you print this, be sure to use a heat resistant material. Vacuum tubes.... especially transmit tubes get extremely hot and PLA will not cut it. It could soften and deform.---!!! This is a fan shroud for a Heathkit SB-220 linear amplifier. It is designed to fit in the opening for the stock cooling fan and helps to focus the air forward towards the 3-500z vacuum tubes and their pins/socket. I was hoping to also reduce the fan noise, but it seems unchanged. There are 3 files, a complete STL, and two pre-cut portions. I find it is easier to print the two pieces and glue them together with a good CA glue. The dimensions are pretty snug, and will most likely require some sanding to fit. The mounting holes are designed to accommodate 6-32 machine screws... 1/2" long pan headed machine screws are recommended.