I am trying to verify the PT triode sold me for my marshall 50w is defective.  The heater wires show continuity to the 6.3v center tap and the 690 secondaries show continuity to their center tap.  I'm pretty sure this isn't supposed to happen but want to be sure before I buy another PT. Could someone with more experience veriy this please?  This is my first tube amp after building quite a few pedals.  Wish I had noticed before I wired it up.  I did notice before I powered up so it isn't anything I did.

I have a Ceriatone board and chassis.  I was planning to buy their transformers when I got some more money but decided to go with the Magnetic Components to save shipping.  Website said they would ship in two days.  After four days I emailed and they said would ship the next day.  After five more days I emailed again and they said had everything but the PT and would pick it up and ship it the next day, and refund the shipping. I waited a week and emailed.  Said he had been sick with the flu and would ship that day, which it did.  They refunded the shipping but shorted me 6 cliff jacks.  Emailed me again and they said they didn't charge me for the jacks.  Fine, but now I had to wait for another order, because they never mentioned it.  Now the PT, which I had to wait three weeks to ship seems to have arrived defective.  I'll probably ask for a replacement just for kicks but based on my past experience I don't even expect an answer.   

These are one set of Magnetic components as I stated in my post.  I'm not sure where you're getting MM from, but thanks for the response.

After pulling the secondaries from the diodes I am reading about 40 ohms from each secondary to CT and about 80 accross both secondaries.  Is this normal? I read on metroamp forum that the secondaries shouldn't have a short to ground, and a short indicated a bad PT.   

As for the heaters, I noticed the sockets were reading a short to ground.  I pulled the CT from the ground and the sockets aren't showing a short anymore. The short was to the CT.  I haven't pulled the heater wires from the sockets yet. 

I did try to power up first with everything hooked up and the main fuse blew.  I'm not sure how to troubleshoot that if the secondaries shorting to ground is the normal condition. 

But bear in mind the difference between a short to ground and 1-2 ohms is not that much and you need a good meter to read those sort of numbers. A cheap meter will give you the wrong answers .

I did not realize where you were at in the build process.  If you do not even have the secondaries hooked up and you are blowing the mains fuse, you must have something wired wrong somewhere.  It will not hurt your PT to power it up the way it is, just make sure any secondary wires are isolated/taped/protected from shorting to anything.  If your heaters are functioning properly, I would suggest taking a breather and closely double checking all of you connections against the schematic/layout.  Schematics are free and easy to print, don't be afraid to use a pen or highlighter to mark each connection on paper as you verify them and any component polarity/values.
Good Luck

Amp is working now!  Had one more little hiccup; I had the output primaries switched.  I had guessed right but somehow managed to do it wrong anyway.  When I went off standby both output tubes turned into  blue sparklers.  It was kind of cool looking actually for the one second it took me to switch it off.  I switched the wires and everything works perfectly.  Has a little more hum that I would like but still acceptable.  I'll try auditioning preamp tubes, Larry grounding, cleaning up the wiring etc after I get it broken in.  Need to get a proper speaker cabinet, install LAR/MAR, etc, will be tweaking this thing for years but that's why I built it.