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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 17th May 2018, 10:05 PM   #21
pitchinwedge is offline pitchinwedge  United States
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Quote:
Originally Posted by akimmet View Post
Your new diagram looks correct, another way to correctly install a snubber is in parallel with your load (the power transformer). However, your calculated values are off. A common combination is a .1uF X2 safety capacitor in series with a 4.7R 1W resistor.

Most importantly the capacitor needs to be at least X2 rated, this will help avoid catastrophic failure of the capacitor. Older amps commonly used 2500V ceramic capacitors and they were known to occasionally blow apart.
Gads, those formulas must be way off! Anyways, I found some parts based on your comment. Will these work?

0.1F 20% 400VAC Ceramic Capacitor Y5V (F) Radial, Disc
4.7 Ohms 5% 1W Through Hole Resistor Axial Flame Proof, Fusible, Safety Wirewound

Thanks for the help!
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Old 19th May 2018, 01:05 PM   #22
akimmet is offline akimmet  United States
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You neglected to mention if the capacitor you chose is safety rated. Make sure the capacitor you chose is X1 or X2 rated! Your snubber needs to absorb voltage transients in excess of 1000V, a standard 400V capacitor is likely to fail.

In .1uF, X2 film capacitors are usually much less expensive than X2 Ceramic capacitors.
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Old 19th May 2018, 02:11 PM   #23
pitchinwedge is offline pitchinwedge  United States
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Yes, the spec sheets rated X2 for 1500v. Thanks again, will try to install it next week.
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