A last minute Jamie Semmens penalty saw Redruth edge past National Two South rivals Hartpury College 18-17.
The sides were level at the break after Redruth gained a penalty try and Tim Stevenson scored for Hartpury.
Tom Notman then gave Redruth a 15-10 lead but Richard Barrington's converted try put College 17-15 up before Semmens' late kick sealed the win.
"It could have gone either way and we're delighted it was us," captain Craig Bonds told BBC Radio Cornwall.
But Bonds said he was concerned his side are not converting enough chances.
"We were getting into their 22 quite often, but were not picking up points when we were getting there," he said.
However he was pleased with the phase of play which led to Semmens' penalty with three minutes to go.
"We had a five metre scrum near our own line and then to work our way down the field to pick up a penalty to win it shows great character," he said.