if you search on "6SL7GT" on Tubes Asylum you'll get a lot of info on that one.
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???