
Best Answer Guitar, 12 July 2017 - 09:25 PM
Leaving aside the possibility of hardware failure or dodgy roms, which though possible, is unlikely.
£5/10p machines don't make any real money for the manufacturers, they are an after thought to the £100 machines. The breweries and inland arcades are the ones they care about.
Most £5/10p machines are the same code as their bigger brothers with very little changes. Gold Rush is quite old and was on £25JP so this probably has a £75 streak in it. Assuming it was on 80% as you say, you would need to put £94 in which would cover a £75 streak with 20p to spare. And that assumes the machine pays only the streak out and no other wins.
As edwardb explained in his Compensation thread, lo tech machines tend to have more compensator pots, and only when they are full do they give a signal to pay. Every time you play off a credit, various fractions of that credit get added to different pots, and there are many different ways of doing it.
TL;DR you hit it at the wrong time.
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