Re: Bridge pickup string spacing on Heritage Roy Clark guitar
Below are my replies and comments to all of the information everyone has provided above. Thank you to everyone for your input.
The reason I am asking for confirmation of the string/pole spacing is because finding 53mm bridge string spacing on the guitar was very unexpected. I thought perhaps someone else with the same model of guitar had already been through this and could provide some reassurance. I measured the pole pieces and the string spacing on the guitar, then compared it with uninstalled pickups from Duncan and DiMarzio, both standard and f-spaced. It was obvious that the bridge pickups are f-spaced. I didn't expect a company that has Gibson as its historical beginnings to use this type of spacing, but in the comments above someone mentioned that Gibson has been doing that also. Lesson for me: Always measure string spacing before ordering pickups. It's like the dagnabit need to determine if a bolt is SAE or metric, and having to maintain two sets of tools because of the different standards.
The pickups are definitely Schaller. I know because I took them off of the guitars and looked at the back of the pickups. The guitars were manufactured in 1993 and 1996, and I think Heritage switched to Duncan around 2005 or 2006. The guitars are currently 100% original equipment.
Someone made a good point about the mounting rings not necessarily fitting a replacement pickup. I'll have to do some measurements on that topic. I would really rather not have to drill holes, especially if they are right next to the old holes. If the existing rings don't fit, maybe I'll make my own from maple, dye them, and use the existing mounting holes.
I really like the Heritage Roy Clark guitar, and the Scaller pickups sound very good. No complaints. I can get an amazingly wide range of sounds from the guitars. But there are times when I can hear things with the pickups that aren't quite what I would like to hear - the pickups are sometimes muddy and mushy. It's subtle, the type of thing I can only hear when I am playing a guitar, not when I'm listening to someone else. So I want to try some other pickups. I can always reinstall the original pickups. I would like to try Seth Lover pickups, but something in me resists it because of the exorbitant price - $260 for two pickups with gold covers. So, I think I will first try DiMarzio 36th Anniversary pickups. The reason I bought a second guitar of the same model was to be able to try different sets of string and compare them. That should work equally well for pickups.