A few weeks after someone broke into the offices of the Vallejo Admirals professional baseball team and took a computer and candy, thieves broke into the team’s clubhouse at Wilson Park and stole jerseys valued at $15,000 as well as the team’s technical network equipment, General Manager Kathy Beistel said.

The loss at the office was inconvenient. The computer had been bought secondhand, and the staff learned a lesson about making sure computer information is backed up elsewhere. Also gone was a tub of red vines candy and some See’s lollypops. The team’s landlord quickly replaced the building’s smashed windows.

But the thieves who stripped the clubhouse of its uniforms Thursday have seriously hurt the small-time baseball club.

Beistel learned about the break-in late Thursday, when an employee of the Greater Vallejo Recreation Department told her the clubhouse door was open.

When she arrived at the park, she realized it was more than an open door.

Gone were the gold, yellow and white jerseys purchased last year for players. Some pants were gone as well, as were some of the overflow merchandise, primarily sweatshirts and T-shirts.

Baseball players keep their own bats, and the team’s baseballs were locked in the office away from the park.

That was fortunate, Beistel said. Regulation baseballs cost $8 each, and the team uses four dozen a game. The team’s hats for players weren’t at the clubhouse, either, she said.

But the loss hurts the South Solano County team that is part of a four-member independent Bay Area league that has no budget to replace those uniforms, she said.

In fact, the jerseys, bought at $200 each for the 2014 season, were expected to last three years, Beistel said.

The network equipment is used for broadcasts as well as for concessions and other game-day operations, she said.

She pointed out that stealing from the Vallejo Admirals isn’t like purloining from a major league team. Players don’t jet to away games. Right now, they don’t even have a team bus. They carpool.

Nor do they buy condominiums or lease apartments in Vallejo for the season. Those who aren’t local hope to find spare rooms at residents’ homes, where they have a room of their own, access to a bathroom and kitchen in exchange for providing season tickets and other perks to the homeowner.

“They don’t make millions,” Beistel said.

But the local team plays as hard as those in the big leagues, she said. “It’s real baseball,” she said, explaining that the league is the equivalent of single- or double-A ball. “Some are on the way up to the majors, and some have come down from the majors,” she said.

“I’ve seen some plays I thought were not humanly possible. We’ve had a three-out triple play. I was thinking, ‘Where’s the instant replay?” Beistel said she wishes she could watch that play again and again.

She began her connection with the Admirals as a fan, then became a volunteer. Then she was asked to be general manager. “Keys to the kingdom!” she said. “I’m in my happy, happy place. I wouldn’t trade this for anything.”

But the loss is a blow to a team that will have tryouts in March and April and spring training in May before the season opens in June.

Beistel posted the loss on the team’s Facebook page, and was surprised at the response.

The posting soon got between 16,000 and 17,000 hits. It has been shared nearly 200 times.

“Talk about a silver lining,” she said. “This is an awesome community. This has validated that this team is loved.”

Beistel has asked that those who see anyone wearing a Vallejo Admirals jersey take a photograph and report it to police. “Not even the players have the jerseys. They belong to the team,” she said.

A half-dozen supporters urged her to raise money for the jerseys’ replacement, so the team has started a GoFundMe account at www.gofundme.com/jx340o.

Donations have started. “I can’t even tell how we and the team appreciate it,” she said.