tube testing in the Philadelphia area?

[TommyKnocker]

I am seeking recommendations for a shop in the Philadelphia/tri-state area to test the 6L6GC's in my Mesa 400+
I have just read about the excellent tester as described on the Eurotubes site. Before taking the plunge for twelve new power tubes...
I'm hoping to find someone locally that can determine with some degree of thoroughness and accuracy
that perhaps most of the tubes are strong and only one or two need to be replaced.

I have stopped using the amp out of respect for the quality of the equipment.
If in fact most of the tubes are bad, then I'm OK with a full retube even though I would have to wait to pay for it.

[B-string]

The single best tube tester is the amp they are operating in. Have a good tech check them in the amp with the understanding you DO NOT want or can afford to install a full set.

[beans-on-toast]

You don't want to simply test the tubes. Tubes perform differently at different operating voltages. What might pass as acceptable at one voltage might fail at a higher one. Just about all tube testers operate at a voltage that is far below what your 400+ operates at. That's why the amp itself is the best tester as B-string said.

You can send them to Eurotubes for testing. Or send them here, they offer a tube testing service. They use the same tester as Eurotubes. More info on their site as to how they test the tubes.