Sorry to revive such an old thread, but I read this today and was interested enough to do a little research on these mystery boxes on my own.
I found this picture of a PD catalog someone is selling on ebay. I've attached a picture from the cover, as well as the link to the item if anyone is actually interested enough to buy it (I am not the seller and have no affiliation). I also tried to find a scan of this floating around on the 'net somewhere and came up emptyhanded.
What I thought was interesting about this picture is that it shows the "newer" digital models along with the older precision supplies, although I can't make out which one it is. This was at one point in time at least, their lineup prior to the acquisition of their branding and the change that followed. An interesting time for a PD catalog, and I'd like to see what's inside if anyone else has found a scan of it somewhere.
Cool find, Johnboy. The models on the cover, as far as I can tell given the low resolution and excessive compression of the seller's image (clockwise beginning at the top-left):
1. TP340 or TP343A, triple-channel. It looks like there may be an 'A' designator at the end, so it may be a 343A. The TP340A has positive and negative binding posts for Source A and B, whereas the non-A is positive for Source A and negative for Source B (as in the image). The TP325 has a single line of lettering at the top, whereas the 340 and 343 have two-line lettering.
2. TW347?, dual-channel. I've only seen the 'D', digital, version of this.
3. 2020B or 2010, precision supply. By contrast, the 5020 doesn't have a range toggle between the amber/yellow lamps and the 2005A has an additional oven lamp.
4. 6010(A/B/C/D)?. I've never seen the digital version of this, but the range table on the left side of the panel looks like the one on the analog 6010.
5. 3K10, high-voltage supply (3000 V, 10 mA)
6. 6050C. The 6050D has lamps on either side of the display, like #4, but with four ranges instead of the three in #4.
Corrections welcome.