Orange 100 mkii

[Perkinsman]

The new fuse came in the mail yesterday & once replaced everything works fine again. Thanks for the continuing education. I do have a couple questions, does this amp (& most others) have a separate power source for preamp tubes & power tubes or are the generally the same source for both? Are they usually wired in series so that if one tube isn’t working, none are?

[BobK]

It's more typical to see the heaters wired in parallel, but there are some older (much older?) amps with serial heaters.

There are some amps that rectify the heater supply for the preamps to reduce hum.

Fusing the preamp and power tube heaters separately is "somewhat" rare.