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  • Gottlieb Coil R20-4 vs. A-9735

    From Kerry Imming@21:1/5 to All on Sun Nov 13 09:07:34 2022
    This is for a 1958 Gottlieb Roto Pool I am helping with.
    I thought the A-9735 coil was a substitute for the obsolete R20-4 coil.

    This is both from the very useful flippers.com Coil Resistance Chart: https://www.flippers.com/coil-resistance.html
    and places selling coils online.

    The game owner says the A-9735 is 1/16" longer than the original R20-4
    coil. Is this expected? Is there a way to make the A-9735 work in the
    relay? For example, can the coil core be filed down?

    - Kerry

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Robertson@21:1/5 to All on Sun Nov 13 15:26:54 2022
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    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Kerry Imming@21:1/5 to John Robertson on Mon Nov 14 07:32:06 2022
    On 11/13/2022 5:26 PM, John Robertson wrote:
    On 2022/11/13 7:07 a.m., Kerry Imming wrote:
    This is for a 1958 Gottlieb Roto Pool I am helping with.
    I thought the A-9735 coil was a substitute for the obsolete R20-4 coil.

    This is both from the very useful flippers.com Coil Resistance Chart:
    https://www.flippers.com/coil-resistance.html
    and places selling coils online.

    The game owner says the A-9735 is 1/16" longer than the original R20-4
    coil.  Is this expected?  Is there a way to make the A-9735 work in
    the relay?  For example, can the coil core be filed down?

    - Kerry

    Hi Kerry,

    I don't have dimensions of the coils on flippers because that would be
    too much like work!

    That being said I guess when things like this come up I should add the
    height of coils that people notice, so if folks want to send me just the total height of the body of the coil I will add a column for that added dimension.

    I do know that there are Europeans making new coils and they are metric,
    and don't always fit properly...where did you get the A-9735 coil from?

    And as for fitting, is this a relay or an action coil? If an action coil there are coil holders that have slots for the front hole so they can be adjusted for off-size coils, otherwise I think you can file the sucker...

    John :-#)#

    Hi John,
    Thanks for your follow up. I did not mean to imply that your chart
    should be changed, just pointing out that it's very useful. Thanks for
    keeping that posted.

    This is a relay coil. I'm helping someone who sent me an email question
    about where to get an R20-4 coil. Searching for R20-4 coil turns up
    lots of places selling the A-9735 as a substitute so I assumed this was
    just a naming or insignificant resistance difference.

    I'll see if he can file it down to fit. I wanted to check here first to
    see if there was any experience with this problem.

    - Kerry

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Robertson@21:1/5 to All on Mon Nov 14 07:31:20 2022
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    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From P2K@21:1/5 to All on Mon Nov 14 14:02:44 2022
    The heights are:
    R20-4: .985"
    A-9735: 1.008"

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Robertson@21:1/5 to All on Mon Nov 14 14:32:41 2022
    On 2022/11/14 2:02 p.m., P2K wrote:
    The heights are:
    R20-4: .985"
    A-9735: 1.008"

    Thanks, added Height of Coil - inches to the list.

    John :-#)#
    --
    (Please post followups or tech inquiries to the USENET newsgroup)
    John's Jukes Ltd.
    #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
    (604)872-5757 (Pinballs, Jukes, Video Games)
    www.flippers.com
    "Old pinballers never die, they just flip out."

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Kerry Imming@21:1/5 to All on Tue Nov 15 08:20:57 2022
    On 11/14/2022 4:02 PM, P2K wrote:
    The heights are:
    R20-4: .985"
    A-9735: 1.008"

    Thanks for the height information. I did not see this height difference
    in any online sales listings I found.

    FYI... I was rechecking today and see that Mayfair Amusement shows an
    R20-4 available and doesn't mention that it's a substitute.

    - Kerry

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)