(Topic ID: 298741)

FYI: exact replacement Gottlieb System 80 PCB stand-offs

By sparky672

60 days ago



Topic Stats

  • 6 posts
  • 2 Pinsiders participating
  • Latest reply 29 days ago by G-P-E
  • Topic is favorited by 6 Pinsiders

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#1 60 days ago

This took some effort to track down so I figured I will share. (the suppliers carry ten of thousands of different PCB spacers and stand-offs in hundreds of configurations, and each supplier uses the same terminology differently... "spacer" and "standoff" may or may not mean the same thing.)

My Gottlieb System 80 Volcano (1981) uses this style of nylon stand-off to hold the circuit boards in place. After 40 years, some of the inner locking tabs are worn out, missing, or the whole mounting pin is just totally snapped off clean.

Nylon PCB stand-off / spacer #6 mounting screw

The size is measured as the air-gap between the surface of the wood and the underside of the PCB. They are all attached to the wood panel via a through-hole and a self-threading #6 screw with a slotted-flanged-hex-head, a.k.a. sheet-metal screw.

The sizes are as follows (for Volcano, likely similar on other System 80 machines)

•  ⅞" for the various boards... MPU, PS, Driver, Sound, etc. (qty 22)
•  ⅝" for the Credit display (qty 4)
•  ½" for the four Score displays (qty 16)

Docent Electronics sells the ⅝" size (credit display) on their System 80A/80B and System 3 pages, but not any other sizes... I already asked.

I managed to find them all on Mouser. According to the data-sheets, all critical dimensions are the same including a 2.9 mm mounting hole for a #6 self-threading screw (3.5 mm O.D.). I have no idea if these are same brand originally used, but they appear to have come from the same molds.

• ⅞" (22.2 mm) here
• ⅝" (15.8 mm) here
• ½" (12.7 mm) here

They have five more sizes available, all in stock...

¼", ⅜", ¾", 1", and ~1-⅛"

#2 58 days ago

Received my order today. I will confirm these are identical to the originals.

#3 57 days ago

I would normally stock the US made ones from MicroPlastics, Inc. But now that MicroPlastics, Inc was bought out by Essentra, I have had problems restocking plastics. Essentra was taking an extremely long time to incorporate the MicroPlastics product line into their own and I'm not sure they have finished yet.

Still have a few sizes, though:
https://www.greatplainselectronics.com/products.asp?cat=134

#4 57 days ago

Yep! I'm sorry I did not check with you on these. GPE has been off my radar since the last couple of things I needed were out of stock or NLA.

Thanks for chiming in here on these... I would have saved myself a ton of effort had I remembered GPE first.

4 weeks later
#5 29 days ago

After ordering some from both Mouser and GPE, I found them to be identical in every way except one. The ones from GPE are very slightly off-white, which perfectly matches the 40-yr-old originals on the machine. They almost look yellow-ish from age. If I had to do again, I'd get all from GPE.

#6 29 days ago

The plastic (nylon) color is called "natural". "Natural" color means it is based on whatever color the source plastic was for that day. Sometimes pure white, sometimes a translucent white, sometimes a whitish yellow or tan color or a cross between colors. Luck of the draw as to what color you're going to get. Most often, it is a translucent white with maybe a slight hint of tan or yellow to them.

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