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What are these tubes

I have an integrated amp with three tubes in the pre-amp. One of them is a Tung-Sol 6SL7GT made in the USA the other two are Raytheon. Underneath the Raytheon stamp are the numbers: 230, immendiately below them are the numbers 5-52. Does this tell me what kind of tube they are, or what I would need to replace them???
uppermidfi
kgturner's avatar
kgturner
663 posts
 
perhaps a picture of the tube could help people in assisting you.
bdgregory
1,710 posts
 
if you search on "6SL7GT" on Tubes Asylum you'll get a lot of info on that one.
mcfarland
356 posts
 
The Tung-Sol 6SL7GT is probably just that, and, if it is still a good tube, it's probably a really nice one. The two Raytheon's are probably 6SN7 GT's since that is what the tube complement information calls for. The power tubes should be four KT 88's. If you wanted to replace these tubes, you should be looking for one 6SL7 and two 6sn7gt's. I don't know if your unit is self biasing or not. It probably isn't. If the power tubes need replacing, it should probably be done by a qualified technician. Do not remove the power tubes without noting which socket each tube should return to. The other tubes (6sl7,and 6sn7's) can be removed and replaced at will, with the 6sl7 going in the 6sl7 position and the two 6sn7's in their respective positions. Happy listening.
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