Fuses

[StrummersOfThunder]

Question for the amp gurus

Any idea why an amp would have three 0.5amp 250v instead of a single 1.5a/2a?

[sizzlingbadger]

To protect different parts of the circuit. Pretty common to a have slo-blow on the primary, and fast blow on the HT, then there is the heater circuit and some have fuses on the OP transformer or low voltage switching circuits.

[StrummersOfThunder]

Yes that makes sense.
Popped a fuse on the bassman 6g6b last night. That’s actually handy as I can work out what part of the amp was the issue

[StrummersOfThunder]

Righto
Isolated the issue to one of the 5881 output tubes
Damn
Guess it’s a new set!
Actually I have a matched pair of 6l6 groove tubes
Should be good to go?
Might be the day I learn to bias an amp…

[jeremyb]

5881 is just a mil spec 6L6 isn't it, but lower wattage... so going to 6L6s should give you more clean headroom and volume, rahhh!

[StrummersOfThunder]

5881 is just a mil spec 6L6 isn't it, but lower wattage... so going to 6L6s should give you more clean headroom and volume, rahhh!

Every time I read the literature about biasing amps it gives me a brain ache

[jeremyb]

5881 is just a mil spec 6L6 isn't it, but lower wattage... so going to 6L6s should give you more clean headroom and volume, rahhh!

Every time I read the literature about biasing amps it gives me a brain ache

Yeah its part of why I like cathode biased amps, too lazy to deal with biasing