Rectifier tubes?

I'm kinda new at this so if what I say isn't true, somebody jump in and say so.

I have an Audio Note Kit 1. The biggest change I have noticed so far was going from a Raytheon 5U4gb to a 2/59 US Army Coke bottle RCA 5U4G

I think the 5U4G and 5U4GB are interchangeable

I also like the JAN Sylvania 5931. This is also one of the coolest looking tubes I have. This sucker has 3 micas and a "girder" in it. Huge base also.

jp

Albert,

Thanks for the BWS link. He does have some good prices. Has anyone heard their preamp? Also, will the 5931 interchange with 5ar4?

Joe

Jake 42 - 5U4G is rated for 225ma; 5U4GB for 275ma. I don't have my Tube manual here; but I think the GB may be rated for a higher voltage also. Voltage sag under load may be slightly different too. A GB can be subbed for a G, but you need to check circuit demands before subbing a G for a GB.

I don't know where Tomryan buy 5U4GB, most of them are under $15 each on ebay. I got them as low as $5

Hi Tom Ryan. Most Nos 5au4's and subs are readibly available, easy to source and relatively inexpensive. If you can ascertain the voltage requirements of the rectifier in the airtight, you have many options available to you. Rectifiers "DO" make a difference and in many circuits... it can even be quite dramatic. The most important parameter here is to make sure each side of a full wave rectifier is tightly matched and the tube itself should test no less than 95%.Good Subs for a 5au4 would include.... 5aw4,5ax4,5t4, 5v4, 5y3,5z4,5as4,,5931 and their euro equivalents. I like the old st shaped 5v4g in particular here for a sub. Hope this helps.