Buying tubes...do they vary???

The last thing you want is to buy new tubes from Joe Blow Tube Supply, only to have some fail prematurely.  I definitely would do some research on the Audiogon forums and not simply buy from the cheapest supplier out there that pops on your first google search.   

I had good luck with RAM Labs (tubeaudiostore.com) on a fairly recent purchase of twelve tubes to retube my Music Reference RM9 MK II.  Buying from CJ is also a good option.   Good dealers of vintage NOS tubes include Brent Jessee and Vintage Tube Services.

I once purchased power tubes from a self pronounced tube guru & dealer of audio equipment based in California, only to have one tubes fail within 20 hours.  When I called requesting a replacement I got a lot of attitude, even though the tubes were guaranteed.  He told me I had to ship it back on my dime so he could test it.  I chose to cut my losses and moved on.

+1 for Andy at Vintage Tube Services. He's probably one of the best in the business.

I too would suggest either CJ (if you want the same sound you had when you bought the amps) or, if you want to try vintage tubes, Andy at Vintage Tube Services.  Andy would certainly be able to suggest tubes that would suit your tastes, as he's very knowledgeable about which tubes will give the desired result in your amps.

Appreciate the responses folks, thank you! Yep, will have to take a look at Vintage Tube Services.

Thank you!

Andy is great and sells top quality NOS tubes, but I don't think he sells new production power tubes.
If the tubes in your CJ say EH 6550, then you can replace them from one of the reputable dealers. The key is in testing for the lowest noise and microphonics, then matching the tubes. I'm sure that's what CJ is doing and charging a higher price.