Does a page redirect affect EPC?

impressions and CTR are unchanged

[Fractalus]

I have a page with a single leaderboard Ad unit that has been doing pretty well for the past month. The page impressions have been stable (about 60K/day), and the CTR is remarkably steady too. But 3 days ago the earnings dropped dramatically (EPC at 25% of previous day), and has been dropping slowly but steadily since. Page impressions still the same, the CTR up marginally. Now my daily earnings is less than a quarter of what it was before, all of a sudden.

At first I thought maybe I was running out of ads, but checking various regions where most of traffic originates with the Adsense Preview Tool, the ads seem the same as they were the past few weeks.

The one thing I did 2 days prior to the initial drop, was replace the HTM page with an ASP equivalent. Then I redirected the HTM reference to the ASP file. Could this confuse the Google bots and affect how Adsense calculates earnings? The content of the pages are word for word identical. Or is there a more common and obvious explanation for this?

Sorry if this is a typical noob question. I've search the archives and haven't come across a discussion that specifically address this. Any thoughts or advice is much appreciated.

[leadegroot]

Do your logs show 200s with the correct filesize for the new page?
Are you sure you did the 301 correctly?

[jomaxx]

If you're doing a Javascript redirect, I would recommend using the .htaccess file to do a 301 instead.

[Fractalus]

leadegroot: Yes, the logs are showing 200 with the correct size for the ASP request, 302 for the HTM request (meaning temporary re-direct rather than permanent). I could mark it as permanent if you think it makes a difference. I'm sure the redirect is working because the logs are showing an immediate GET on the ASP file after each GET on the HTM file (from the same IP).

jomaxx: I'm doing the redirect in IIS Manager (Win2003 Server).

Thanks for the replies. Maybe I'm approaching the problem from the wrong direction. Maybe the redirect has nothing to do with big EPC drop. Is there a way to determine the value of the ads which are on one's site? I had believed that the same ads meant approximately the same EPC, is that an entirely false assumption?