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
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 :-#)#
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
The heights are:
R20-4: .985"
A-9735: 1.008"
The heights are:
R20-4: .985"
A-9735: 1.008"
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