Hehe. Not knowing anything else, that’s why I as asking.If it were me, I would just use a 500k and not worry about adding 7.5MOhms. I can tell you are a by the book kind of guy though.
I guess the 2M resistors usually shown for this mod are safety backups for fixed biased power tubes? Have read that w/o them you have a chance of burning up your power tubes.If the wiper fails, you are going to know something is wrong and investigate before too long. (Hum, loss of volume, distortion, no clean headroom, etc.) The 7.5Mohms is hardly a "safety" compared to the 1M max on the datasheet. It's cathode biased, so you have some safety there.
Ok. I was confused but now that makes sense.Those look like regular grid stoppers to me.
Makes sense … and I just read that NOS tubes used to have pins 1 and 2 internally connected. Modern tubes don’t. i.e., don’t use Pin 1 for a solder point.Unfortunately, they will have to be relocated for the Type-2. The best place is right on pin 2 of the EL84's. Some people just float them free as they are strong enough to support a wire. Some heat shrink will give it even more support and protection from inadvertent short. Or you can install an isolated lug to solder them to. Not recommending using pin 1 as it's "IC" on the datasheet (internal connection).
The green wires will stay in place, but they will have the grid stoppers on the other side. The turrets holding the 10nF caps will wire to the top of the pots. The wipers will come down to the end of the green wires. And the bottom of the pots will go to ground.