This amp is using 4...a2wa's and 12...1625's. The 1625's are set up 6 in parallel and the other 6 separate in another set. Are one set for the high and the other for low? Even though there are 6 connected in series and the other 6 connected in a separate series can thay possibly work as a set of 12 for output at a single stage? I know the 1625 's/807 are rated at 25-30 watts each. It's not marked with a company name but looks like an elkin type csse. It for auction on eBay. Sorry I dont know how to post the listing here. Curious. I've, never seen tubes in an amp setup like this and 12 seems like over kill. Thanks