I love my 6HM5 tubes from Yugoslavia better than anything else I've tried which isn't a whole lot I'll admit. They're not expensive either. I should mention I am using Massdrop Sennheiser HD 6XX

Thanks TrollDragon, pretty confusing for me I should probably just forget it.

NM, I found my answer on page 77.

Do the jumpers need to be changed or the 6BE6 tubes? I'm on the default EF95

I've been using a pair of 6HM5's from the link mordy posted above for several months, I don't think a year yet. Anyhow I started getting a hum out of the right channel so I sprayed the sockets with Deoxit and also I cleaned the pins on the tubes and still had a hum. I switched to the Voshkod...

I'll go along with that..Although I don't have anywhere near as much experience as mordy, I do have experience with these tubes and they are the ones I use 75% of the time and the other 25% of the time I use the Voshkod 6ZH1P-EV tubes. I'm still using the stock power tubes and I have no...

Thank you mordy

I have one driver tube that glows on the top and one that glows on the bottom and not the top. Does anyone know if this is normal? It seems to be sounding fine.

Both of my tubes have the rectangular getter, I saw some of those tubes you have pictured above on ebay and also the RTC labeled Mullard tubes. I was thinking about getting one or the other but I was searching on here and can't really find anything about there sound. Anyhow, I feel a little...

Thanks for the response gibosi, they are indeed 6ak5w. So if you are correct do you think they would sound close enough to each other that it would not be an issue? the tube on the right after closer inspection (now that it's a sunny day) appears to have the bottom row of etching warn off so...

Hey guys, I have been learning a lot about tubes from this thread and I really appreciate it. Can someone tell me if this tube on the right looks like a legitimate Mullard? Personally I think the tube on the left is legit but the one on the right I have my doubts about. It has one row of numbers...

It might be a long shot but did you check the pins on the tubes to make sure they're clean of any corrosion?

Thanks for the fast response mordy, that makes the hunt a little easier.

Are all of the 6N6P-IR Tubes created equally or do I need to look to make sure they were manufactured in a certain factory? Also I see Gold Grid mentioned in the description of some of them, is that something I need to look out for or are they all the same?

O.K..Thanks for the reassurance TrollDragon.