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July 04, 2022, 10:46:36 PM

Author Topic: custom chassis: does material matter?  (Read 1384 times)

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Offline denti alligator

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custom chassis: does material matter?
« on: May 30, 2017, 03:12:35 AM »
I have a custom Crack chassis that I got from Jim R. that looks to be some kind of plastic. Hard to tell, but doesn't look like metal. Maybe Jim can chime in on what it is, but I wanted to double-check that using such a plate would not pose a grounding problem.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Leland Hankins

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Re: custom chassis: does material matter?
« Reply #1 on: May 30, 2017, 05:15:02 AM »
If I remember correctly you will not have to isolate a component from the plate, i.e. transformer etc, but the component will still have to be grounded to the common ground tab.  I have built several Bottlehead and other products with non metal top plates without any problems, but heat can become a problem depending on the material used.

Lee Hankins
« Last Edit: May 30, 2017, 05:19:12 AM by Leland Hankins »

Offline denti alligator

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Re: custom chassis: does material matter?
« Reply #2 on: May 30, 2017, 08:00:50 AM »
I think it's acrylic. Jim says PB was consulted on this when he ordered the plate, so maybe he can chime in on how best to ground it.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Paul Birkeland

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Re: custom chassis: does material matter?
« Reply #3 on: May 31, 2017, 10:07:01 AM »
I can't imagine that I would've recommended acrylic as a top plate choice for a Crack, unless there's a metal plate underneath it to hold at least the octal socket, otherwise you'll just melt the plate.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Leland Hankins

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Re: custom chassis: does material matter?
« Reply #4 on: May 31, 2017, 10:46:20 AM »
Plexiglass has a melting point of 320 degrees F (160 degrees C).

Offline denti alligator

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Re: custom chassis: does material matter?
« Reply #5 on: May 31, 2017, 11:43:14 AM »
Honestly, I can't tell what the material is. I'm hoping Jim can clear it up. It's a nice looking plate, and I'd like to use it, but I want to be sure first.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Kris

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Re: custom chassis: does material matter?
« Reply #6 on: May 31, 2017, 11:54:30 AM »
Post a picture.
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Offline denti alligator

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Re: custom chassis: does material matter?
« Reply #7 on: May 31, 2017, 12:09:52 PM »
Jim thinks it might be polycarbonite (lexan). He had it made by Font Panel Express. That's all he can tell me.

Here's a pic.

P.S. I held it an inch from the surface of my electric stove, set on high, for about 10 seconds. No drooping. I expect this is lexan, though maybe I should hold it for 30 seconds to be sure.
« Last Edit: May 31, 2017, 12:22:30 PM by denti alligator »
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Deluk

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Re: custom chassis: does material matter?
« Reply #8 on: May 31, 2017, 11:45:37 PM »
You can hot mould Lexan with a heat gun so not ideal in this application. Google it. It's very tough, but that's partly due to its flexibility.

Offline denti alligator

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Re: custom chassis: does material matter?
« Reply #9 on: June 01, 2017, 03:55:47 AM »
Sure, but compare the heat the Crack generates to what a heat gun generates. Huge difference.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Paul Birkeland

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Re: custom chassis: does material matter?
« Reply #10 on: June 01, 2017, 10:23:44 AM »
To me that looks like an aluminum chassis milled by Front Panel Express that has been powder coated white, then engraved and infilled.  Notice how the edges of the cut holes are shiny metal?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline denti alligator

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Re: custom chassis: does material matter?
« Reply #11 on: June 01, 2017, 10:27:14 AM »
The edges of the holes are actually transparent or milky white. I'll post a closeup later today.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline Paul Birkeland

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Re: custom chassis: does material matter?
« Reply #12 on: June 01, 2017, 10:45:56 AM »
Take a utility knife and scrape away some of the material on the inside edge of the power transformer hole.

I recognize the work as being from FPE.  The white finish is slightly pooled on the edges, indicating that the piece has been powder coated.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline denti alligator

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Re: custom chassis: does material matter?
« Reply #13 on: June 01, 2017, 11:04:05 AM »
Yeah, I think you're right. I was deceived by two things: 1) the way the light plays off the white top coat is really amazing and tricks the eye. At almost all angles it looks transparent on the inside. 2) it doesn't feel as dense or heavy as the usual BH metal plate.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Offline denti alligator

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Re: custom chassis: does material matter?
« Reply #14 on: June 01, 2017, 12:48:40 PM »
Unrelated matter, but instead of starting another thread I'll post it here.

I appear to have applied too much heat to the power switch. One of the tabs is no longer rigid and moves with the switch (see linked video). Does this need replacing? If so, what is the part no. I'm looking for one on amazon, so I can use Prime to get it by Saturday, and it's hard to find one with the right dimensions.

https://www.dropbox.com/s/bkeabg9uxz825vs/IMG_0190.MOV?dl=0
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / Eros II / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable