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Rectifier tubes?

I have an Air Tight HTM-300 amp which has tube rectification. I've rolled a number of NOS types over the last three years and am wondering two things: 1) How long a life do these tubes have, in general, and 2) Any suggestions for good rec. tubes (5U4GB) in this amp or in general? I'd especially be interested in new tubes as NOS are hard to get and are iffy.
tomryan

Showing 1 response by nascimento1958

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nascimento1958
6 posts
 
I know the topic is very old, but I will respond because it can serve someone for information!
The Airtight ATM300 accepts 5U5GB / 5U4G and 274B, but the ATM300A and ATM300R only accept 5U4GB, according to the manufacturer, any other model will damage the amplifier!
I have an ATM300, I really like the 5U4GB Tung-Sol and the 5U4GB Sylvania, Takatsuki 274B is my preferred rectifier tube (but decreases the maximum amplifier volume) since the Shuguang WE274B is also very good and has the same efficiency as the 5U4GB!
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