Peavey classic 30 speaker confusion

[Randall]

I have a Classic 30 in for a blown 3A mains fuse, so far after replacing the blown 2A fuse that was n it, I find nothing else wrong. However, I do notice it has an 8 ohm speaker in it labeled 70777104, which shows to be a Peavey Blue Marvel made by eminence. The problem is, the manual says it is a 16 ohm Blue Marvel, and the ext speaker jack reads 16 ohm minimum load. The schematic does not indicate which.

So, is this the correct speaker for this amp, and if not could it have been a factor in the under sized fuse popping?

[Enzo]

8 ohm, 16 ohm, being off impedance would never blow the fuse.

The schematic does not indicate which.

Doesn't indicate which what?

The amp runs internal speaker on the 16 ohm tap. If you add a 16 ohm external speaker it makes an 8 ohm load, and the external jack switches it all over to the 8 ohm tap.

The stock speaker is a 70777144, not 104. 70777144 is a 16 ohm 12" 121638.

70777104 is a 12838, an 8 ohm speaker used in Bravo and Classic 50 2x12.

They also show 70777104 as an earlier speaker as well, the 12820 used in Studio Pro models.

I suspect one of those two 104s is a typo, as they would not have the same part number for two very differnt speakers.

[Randall]

"Doesn't indicate which what?"

Which load it should be. Sounds like it is a replacement speaker. Thanks for the help.

[Enzo]

It ought to be 16 ohms for a single internal speaker. That is the tap wired to the speaker.

An 8 ohm speaker there won;t hurt anything, it may not impedance up perfectly, but will not harm the amp. They just are not that sensitive to load.

If you want to be official and use an 8 ohm speaker, you have a couple choices. One is to leave the 8 ohm internal speaker there and just shove an unwired plug into the extension speaker jack. That switches the amp to the 8 ohm tap.

The other way is to wire a plug to the 8 ohm speaker and plu that into the extension jack. The unternal speaker wires are left unused so tape them off to protect them.

[Randall]

Thank you Enzo.