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Old 24th May 2011, 01:43 AM   #1
tbie is offline tbie  United States
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Default Tubelad SE new build

Hi everyone,

I am new to the forum, reached here recently while searching for alternative diodes for D2 and D3 on SE board. I have got the materials required and the diodes are on their way thanks to all the suggestions over here.

I started soldering the stuff and hit a wall. I can't find Mylar insulation film for D1 and U1. I am trying to find it locally in Canton, OH but not able to find it. Can someone suggest where to find this material.
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Old 24th May 2011, 02:15 AM   #2
rknize is offline rknize  United States
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Radio Shack still sells the old school mica insulator kits. It comes with all the hardware you need. Just add thermal grease. You can get TO220 thermal pads from Mouser and the other usual places. Those don't need grease, but you still need a nylon bushing to insulate the screw.

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Old 24th May 2011, 10:04 AM   #3
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You can buy them @ Digikey the partnumber is HS417-ND. It's a small kit that includes the washers, the screws and the mylar insulator.
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Old 24th May 2011, 05:41 PM   #4
tbie is offline tbie  United States
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Thanks guys, I will try Radioshack first. Online they do show TO-220 kits instore availability loacally. If I am not lucky there I will order from Digikey.

Vishnu
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Old 28th May 2011, 04:21 PM   #5
tbie is offline tbie  United States
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I got the the insulator not at radioshack but a local electronics repair shop and did finish populating the board. Now waiting for Edcor to ship transformers. Planning to solder wires for power connections and use a terminal strip to connect transformers. This will be done when I get back home after call. Edcor order placed on 5/5 hopefully they will ship soon.
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Old 28th May 2011, 08:29 PM   #6
tbie is offline tbie  United States
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Excuse me but few more questions, how to clean the flux before firing up the board. Next is would 1N4005 be ok to be coupled with R30 instead of 1N4007.

Thanks
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Old 28th May 2011, 08:48 PM   #7
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isopropyl alcohol aka rubbing alcohol. Get a shallow metal/glass pan and soak the thing in it for 30-60 minutes and then wipe the big chunks off with paint brushes while its soaking. If you can get the stuff to 60c it cleans 10x faster. Problem is heating alcohol safely. I use sonic cleaners with heaters built in, or incubators. Never use the stove or microwave
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Old 28th May 2011, 10:16 PM   #8
evanc is offline evanc  United States
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tbie,
I did not use the diode across r30 on my build. Many hours later and no problem. Evan
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Old 30th May 2011, 01:38 AM   #9
rknize is offline rknize  United States
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A 1N4005 should be OK. What is your B+?
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Old 30th May 2011, 02:43 AM   #10
tbie is offline tbie  United States
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rknize, Thanks for confirming. I planned this build with 300b tubes in mind. They are on their way. I haven't tested the build yet, I am waiting on edcor to ship transformers.
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