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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
nguyenchiro
92 posts
 
You should try out the U52 (same version as 5U4) Osram or BVA as I used two pairs for my Silver Eagle Audio Signature monoblocks.
chriskeating
189 posts
 
The original Western Electric 274B is the king of all 5U4G rectifiers. The Sophia exhibits some of the traits. It is open and extended and strong in the bass. The mesh version may even be better than the standard one. It is priced fairly for a very well made and robust tube.
tapajeurs
11 posts
 
Good Evening,

Does GZ34 and GZ37 are the same?

Thank for any help provided

Best regards
albertporter's avatar
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albertporter
4,949 posts
 
Does GZ34 and GZ37 are the same?

According to the Tube Substitution Handbook the following tubes can be substituted for each other.

GZ34, 5AR4, 52KU, U54, GZ37, and U54.

5AR4 shows the following are also compatible, U77, 5U4GB, 5AS4, 5AU4 and 5V3A

There is also an antique tube, the CV378 (British) which is excellent. I have a couple of them myself.

Last, if you want something cheap but decent there is a Chinese rectifier called 5C3PJ that subs perfectly. I bought some on line for $3.00 each a couple of years ago.

Have fun experimenting, you never know what will sound best until you experiment.
armstrod
610 posts
 
Albert,

I just did search on the 5C3PJ and came up empty. Do you have a link to where you bought them? Thanks!

David
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