Subs for the 5z4 tube?

Anything out there that would fit the bill? I do have a military CV 2748 that's on duty now but want to try some others. Thanks and good listening.

south4302-20-2009 2:53am

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almarg Details Discussions Posts This discussion Message User 9,670 posts 02-20-2009 at 03:57am Copy Comment URL Report Comment Edit Delete An older Sams tube substitution handbook that I have lists the 5AR4, 5CG4, and 5V4 as substitutes. Regards, -- Al
south43 OP Details Discussions Posts This discussion Message User 386 posts 02-20-2009 at 05:05pm Copy Comment URL Report Comment Edit Delete Hi Al and thanks for the info. I'll check to see what's available. Regards, Bret
hotsauce Details Discussions Posts This discussion Message User 108 posts 02-20-2009 at 06:30pm Copy Comment URL Report Comment Edit Delete Check tube bias after any rectifier swap. A different rectifier can be higher or lower voltage, and affect bias. John C.
amandarae Details Discussions Posts This discussion Message User 512 posts 02-20-2009 at 08:33pm Copy Comment URL Report Comment Edit Delete Check tube bias after any rectifier swap. A different rectifier can be higher or lower voltage, and affect bias. John C. Great post! That's why each rectifier seems to have each own signature on the overall sound. It is not because it is NOS/Blackplates/GT/ST/etc. but because it changes the B+ and shifts the OP of the input/output tubes. For example, the 5V4 have a voltage drop of 25 V, 5Z4 at 20V, and the 5AR4 at 17V. For the 5V4, I would suggest to check out the RCA ST type http://img518.imageshack.us/img518/4678/img4488td5.jpg regards,
south43 OP Details Discussions Posts This discussion Message User 386 posts 02-20-2009 at 09:47pm Copy Comment URL Report Comment Edit Delete Wow thanks for the added info Hotsauce and Amandarae. My pre does not have a bias option(BEZ Q3b). I did swap for the CV 2748 mentioned and all is well. Perhaps I should stick with this tube for any replacements. It sounds good and trumps the stock chinese tube the pre came with. From my research are lots of 5AR4 subs out there from nos to current offerings. Stay tuned.

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