• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Upgrade Rouge 88 Mag amplifier

On an amplifier built in a PC board, you need to be relatively skilled and confident to properly remove components from the PCB without damaging it. The Rogue boards are solder masked and through hole plated, so that risk is somewhat diminished, but you still need to be prepared to deal with the occasional lifted trace here and there.

With the 88 in particular, the board spacing for the coupling capacitors is minimized because there isn't a whole ton of space. This means that most "upgrade" parts aren't going to fit the footprint, and it will be awkward to install those components. Their leads may also not fit properly through the holes. If you do this anyway, the amp may not be easy to sell down the road if the inside looks unappealing.

Still, the PPMFX caps from Multicap are what I tend to use in these situations. They are physically not very large and their leads are not all that large in diameter, so they tend to fit pretty well.

In a big push-pull amp with a lot of feedback applied around the whole circuit, I find that these upgrades do more to soothe the mind of the owner rather than to do anything positive or negative to how the amp actually sounds.
 
Yeah, a V-cap teflon isn't going to fit in the Rogue. The leads won't fit into the board, and the weight of the cap will rip the board apart.

Someone who "mods" an amp with a 6SL7 driving a 300B and doesn't immediately get the 6SL7 out of there maybe isn't the voice of wisdom you should be listening to...