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Old 22nd June 2008, 01:57 PM   #11
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Quote:
Originally posted by megajocke
Does anyone know where to find insulators for TO-264 cases? (like for MJL2119x, 2SC5200, FJL4215 etc.)

I use TO-3 mica cut to size and punch a new hole. I haven't had a problem. They are cheap and easy to come by.
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Old 22nd June 2008, 03:26 PM   #12
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Quote:
Originally posted by MJL21193



I use TO-3 mica cut to size and punch a new hole. I haven't had a problem. They are cheap and easy to come by.

Try RS Components at www.rswww.com
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Old 22nd June 2008, 06:28 PM   #13
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Plastic screws are also helpful.
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Old 22nd June 2008, 06:37 PM   #14
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I remember nylon screws as relativ weak.
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Old 22nd June 2008, 10:26 PM   #15
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I'd use those top hat bushings, metal screws and compression (bell?) washers to get higher mounting pressure and reliability.

MJL: Thanks for the tip! Saw a picture of someone who did that for TO-247 but didn't think they would be big enough for TO-264.
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Old 22nd June 2008, 10:30 PM   #16
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Quote:
Originally posted by megajocke
I'd use those top hat bushings, metal screws and compression (bell?) washers to get higher mounting pressure and reliability.

MJL: Thanks for the tip! Saw a picture of someone who did that for TO-247 but didn't think they would be big enough for TO-264.

I use the IRFP240/9240 and they have insulated bushes in the transistors.
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Old 22nd June 2008, 11:02 PM   #17
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Of course, but the original poster asked about TO220.

The TO264 cases (like Onsemi MJL series, Toshiba 2SC5200, Fairchild FJL4315) have these plastic parts too. TO126 and similar packages (BD139, MJE340, 2sd669) have them too IIRC.
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Old 26th June 2008, 10:38 PM   #18
d3imlay is offline d3imlay  United States
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Use a 100W light bulb in series with the line cord on power up to protect against faults. The light bulb will save you, a variac won't.
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Old 27th June 2008, 07:44 AM   #19
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by d3imlay
Use a 100W light bulb in series with the line cord on power up to protect against faults. The light bulb will save you, a variac won't.
Hi,
start with a 40W bulb, and if Ok, then work up through 60W, 100W and if necessary 150W bulbs.
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Old 27th June 2008, 04:39 PM   #20
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unfortunatly the amp blew up on the 3rd or 4th start after the covers went on!
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