I discovered a few previous posts that remark on the grinding noises made in the ETX-70 (and maybe others?). Some of the posts discussing this are reassuring. Thanks!
I have both the ETX-90PE and an ETX-70. The 90 runs very quietly but, as often described, the 70 "grumbles"... a lot! Its very disconcerting and it appears its something that's generally accepted to be in "the nature of the beast". However, this seems this would be like constantly running a car engine with the "check engine" light on all the time... and at some point its going to be correct but I won't know it!
Has anyone determined the nature of the grinding noises? Poorly meshed gears? Lube-less gears? Loose screws or, maybe, just sloppy clearances in the gear mountings? (Slew speed does not seem to matter, by the way.)
I recently acquired the ETX-70 scope and gave it a cursory "restoration" with the intention of giving it to one of my brothers who has some OCD issues (real, not the kind we all often kid about) and I'm afraid (almost certain) he will attempt to "fix" the grinding noises and this will result in a disaster. I didn't know about the noise issue with these scopes; otherwise, I would have looked into other "manual" options. I only reluctantly went for the "goto", electronic scope because I thought this would be encouraging ... but I'm now thinking long and hard about giving this scope as I don't want a bad experience to kill the hobby that I know he'd enjoy (as he did when we were kids).
Any guidance or insights would be helpful.
All the best!
Edited by JoeVanGeaux, 27 May 2020 - 09:40 AM.