Resistor on output jack

[cbass]

Not exactly what you guys are talking about but I belive peavey used diodes from the plates to ground.to protect the OT no-load situations.

[rp]

I put a 270 ohm 5W resistor permanently soldered across one output jack (always used the 8 ohm jack) on all my amps. Transparent compared to the speaker load as mentioned above, and stops any flyback voltage spikes killing the OT if no speaker is connected.

I do fear pudding-headed friends blowing my OTs, though I too have rarely seen it happen, but I've been looking for a good solution. Unless someone chimes in with some negatives (aren't there always negatives?) with using ~200R on the output jack I might start retrofitting my amps. BillyZ says he couldn't hear it, that's word for me.

Most of my amps already have a B+ fuse (after the rectifier not OT CT) so as rooster says is the output resistor just belt and suspenders?

BTW I find a B+ fuse to be a pita on ss rectifier amps. The power-on surges fatigue it too quickly so the resistor trick seems more applicable.

[billyz]

Here is a scan of the Traynor power amp and OT showing the resistor. I was wrong it is 180 ohm 20w. The one I saw was standard looking cement box type.

Scroll down thru the pages to find it on several schematics.

[rp]

Billy, thanks. I'm going to order some chassis mounts types for the amps friends like to borrow. Seems to good to be true, why doesn't every builder do this?

[billyz]

Billy, thanks. I'm going to order some chassis mounts types for the amps friends like to borrow. Seems to good to be true, why doesn't every builder do this?

Cost money.