Help! Blew a power tube fuse in Bogner 100B

[SQUAREHEAD]

It's never happened to me in 25 years (bought it brand new in 1992) but I was switching between Variac and regular mode and I blew one of the little small fuses connected to the power tubes… The amplifier powers up right now but no sound… The value of this fuse is 250 V 500 mA, is it OK to use a 250 V 1A fuse?!
This is all I can find anywhere
Also, Shouldn't the amp work properly just with two power tubes, another words each fuse is connected to a pair of the output tubes… The amplifier should still work just at 50 W correct?
It powers up fine, But I get no sound at all…
Thank you for any advice

 

[scottosan]

Fuses are there to protect the more expensive comppments. Fuse ratings aren’t just arbitrary numbers. Unless you feel like risking further damage uses only the properly fuse rated fuses. Spend a few dollars and exercise some patience.