Tubes for modulus 3A ?

Check out NOS 7DJ8's. This is my favorite way to experience the true NOS in the various AI preamp's I have had. From Modulas 2 to Mod3, to a new Mod 3A, the 7dj8's last a LONG time (1-2years each pair, esp with the M3A). You can have the Orange globe sound of Amperex, as well as Brimar 7dj8's/PCC88. Amperex BugleBoy 7dj8's are STELLAR! pretty much what is described in Joe's Tube Lore about Amperex 6dj8 variety at the Asylum, applies to the 7dj8's as well. But these are the only way to have that NOS sound and feeling, and have the tubes last. But the key is to have no more than 1 pair of 7dj8's in the pre (a pair in the phono, or a pair in the line stage, but not both!). I also use the 6n23p(NOS Sovtec) from ATSI, but have them in phono stage. They are creamier than the Sovtec's I have used. Both the 6n23p and various 7DJ8's I have used, some untested NOS, have never been microphonic on me. In fact, with M3a, microphonics for me are a non-issue!

Monk: Very intersting. I will look into the 7dj8's as well. I almost made the mistake of giving our friend some of my Amperex 6922's, but fortunately searched AA before doing so. I will see if I can use the 7dj8 in my amp as well. I enjoy trying out any new tube as long as they are reasonable priced. The last one was an EI 6922 labeled as a Westinghouse (very strange sound, soft but shallow and one dimensional in my amp) that I still kind of liked on classical music. Variety is the spice of life.

The Russian mil spec 6H23 might be a tube to look at for the subject. Super quiet, good dynamics and not outrageously priced. I got some from ATSI as Dekay mentioned. Can't remember the guy's name at the moment, but they were only $20 each. They came in original stapled military boxes with instructions in Russian rolled around the tube and they've got chrome pins. Maybe Dekay can tell you how to contact the guy. I've misplaced his number, since I don't plan on buying from him again. I had one of those experiences where things just didn't "click".

Yes, ATSI has a web site that you can order online from - http://tubeman.com/index.htm - I just paid with a credit card. The super low noise versions were on special when I first purchased them, but are now $45/mp. I have ordered three times from them without a hitch and did not bother to audition the tubes (which I am saving for a for a rainy day) the third time around. Upscales "old" production Soviet 6922 equivalents were $50/mp the last time I checked and I have not tried those. I found some Telefunken 7dj8's on the web, but have never cared much for the Tel sound and located 7dj8's in India, but have not yet received a price quote or the brand/manufacturer of the tubes. It may also be an old web listing and I may not receive a response at all.

I am using 60's vintage Siemens 6DJ8's with great results. A *far* better sounding tube than the stock Sovteks. I have not had any problems with the M3 eating high quality NOS tubes, but found that it went through the Sovteks rather quicky -- which was doing me a favor as these tubes are my least favorite choice for this pre-amp.