# Differences Between Pro and Basic Tubes

**URL:** https://community.openglow.org/t/differences-between-pro-and-basic-tubes/219
**Category:** Technical
**Created:** [June 28, 2018, 1:50pm UTC](https://community.openglow.org/t/differences-between-pro-and-basic-tubes/219 "2018-06-28T13:50:42Z")
**Posts on this page:** 5
**Page:** 2

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### Author: ![ScottW514](https://community.openglow.org/user_avatar/community.openglow.org/scottw514/32/5_2.png) [@ScottW514](https://community.openglow.org/u/ScottW514)
#### Post date: [July 21, 2018, 5:06pm UTC](https://community.openglow.org/t/differences-between-pro-and-basic-tubes/219/23 "2018-07-21T17:06:02Z")

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> [@palmercr](#):
>
> Perhaps they simply forgot to add it to the pro?

Possible. The Pro file is from yesterday, and the Basic file is from today.

I don’t recall ever not having the long space at the beginning of the pulse files I looked at, but I could be wrong. Do you still have any of the earlier files?

> [@palmercr](#):
>
> unless there is some other difference, such as a PSU setting

I haven’t found any other settings for the HV power supply other than the watch dog, enable, and pwm. The pinout accounting is pretty thorough at this point.

> [@palmercr](#):
>
> Perhaps the pro tube just has more expensive mirrors and everything else is the same.

That would explain the “better optics” statement.

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### Author: ![palmercr](https://community.openglow.org/user_avatar/community.openglow.org/palmercr/32/15_2.png) [@palmercr](https://community.openglow.org/u/palmercr)
#### Post date: [July 21, 2018, 5:13pm UTC](https://community.openglow.org/t/differences-between-pro-and-basic-tubes/219/24 "2018-07-21T17:13:00Z")

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Yes I still have all the files I looked at. I checked a random one to make sure. Starts with Z steps and then XY motion. The Z steps can take some time if the focus is high as they step it very slowly.

Discourse doesn’t like conversations with only two people!

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### Author: ![ScottW514](https://community.openglow.org/user_avatar/community.openglow.org/scottw514/32/5_2.png) [@ScottW514](https://community.openglow.org/u/ScottW514)
#### Post date: [July 21, 2018, 11:16pm UTC](https://community.openglow.org/t/differences-between-pro-and-basic-tubes/219/25 "2018-07-21T23:16:33Z")

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> [@palmercr](#):
>
> Discourse doesn’t like conversations with only two people!

Well, it better get used to it on this site. 😉

This is the PWM output for FULL power on the OpenGlow board, on my Basic:

 ![DS1Z_QuickPrint12](https://community.openglow.org/uploads/default/original/1X/4920758cb0325e07d14a19a29daf75a2968aee7a.png)

This is the result of writing the value 0x66 directly to the SOM’s PWM compare register (controls duty cycle) by the SDMA script.

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### Author: ![GrooveStranger](https://community.openglow.org/letter_avatar_proxy/v4/letter/g/e5b9ba/32.png) [@GrooveStranger](https://community.openglow.org/u/GrooveStranger)
#### Post date: [July 24, 2018, 5:32pm UTC](https://community.openglow.org/t/differences-between-pro-and-basic-tubes/219/26 "2018-07-24T17:32:32Z")

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> [@palmercr](#):
>
> Discourse doesn’t like conversations with only two people!

I have no doubt that some Glowforge staff are lurking. (Hi guys! We do really like some aspects of the product, honest! Please keep adding new features!)

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### Author: ![Lek](https://community.openglow.org/letter_avatar_proxy/v4/letter/l/7ea924/32.png) [@Lek](https://community.openglow.org/u/Lek)
#### Post date: [August 7, 2020, 7:22pm UTC](https://community.openglow.org/t/differences-between-pro-and-basic-tubes/219/27 "2020-08-07T19:22:23Z")

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They are the same tube.

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