AUDIO FORUMS >> Replacement Tubes >> 5ar4 is buzzing???

Message started by Tripwr1964 on 09/19/16 at 21:14:26

Title: 5ar4 is buzzing???
Post by Tripwr1964 on 09/19/16 at 21:14:26

been running a nos mullard metal base 5ar4 in my csp3 for over a year now and love it.  recently i've been hearing an intermittent buzzing emitting from the tube when the music level is down.
doesn't come thru the speakers.
is this baby going out on me?  ok to continue to run it till the end?

i don't have any experience regarding how these eventually fail/wear out.

Title: Re: 5ar4 is buzzing???
Post by will on 09/20/16 at 04:22:06


It is the tube itself, not coming out of the speakers, right? Is it a buzz like an electrical buzz... or might it be a rattle? Rectifier rattle is a known issue that can be fine if you can hack it. I have also read of it being a sign of failure coming, but I usually experienced it with new tubes, so can't say.

I have had rectifiers fail, but not with rattle as a precursor...they just shorted out on startup I think. When mine have shorted, they blew a fuse, without harm to the amp.....

Might google "rectifier rattle" if that is what you think it is.
Good luck!


Title: Re: 5ar4 is buzzing???
Post by Tripwr1964 on 09/20/16 at 15:52:48


right nothing coming out of speakers.

at first i thought it was the transformer, but if you put your ear right up to the tube, you can tell that's the source.

kinda comes and goes the last few weeks.

i'll put in my black base 5ar4 tonight and see what it does.

and i'll search "rectifier rattle" too.


Title: Re: 5ar4 is buzzing???
Post by Tripwr1964 on 09/23/16 at 02:04:07

yeah put my black base 5ar4 in and all is good no buzz.
must be something going on with my metal base 5ar4...
like i said it doesn't come thru the speakers so i'll probably run it till it quits.

Title: Re: 5ar4 is buzzing???
Post by will on 09/23/16 at 19:06:47

Some folks talk about rectifier rattle sometimes coming from loose tube sockets. Does not quite make sense to me. When I have heard it it seems to come from inside the tube. But your talking about the metal base makes me wonder...I am guessing the glass it not loose in the base? Or the metal loose somehow? I have been able to repair loose bases with thin superglues.

Title: Re: 5ar4 is buzzing???
Post by Tripwr1964 on 09/23/16 at 21:12:17

i'll investigate that will.

hope it doesn't go on me.  it was a little pricey and sounds way way better than the blk base mullard i have.  the metal base has so much detail top to bottom.

Title: Re: 5ar4 is buzzing???
Post by will on 09/29/16 at 17:24:10

I hope it doesn't go too Trip!

I get really attached to certain tubes as well, especially to Phillips made GZ rectifiers, but in my case GZ32s. I can still love some American versions...5V4Gs and some 5R4GYs in the just-right blend though. And I love a change up at times, forced by say a rectifier change to adjust elsewhere to sync the change in.

Sometimes I have to change just one other tube, and sometimes 3-4  of the eight tube positions I have with the Torii and CSP3 together....but once the refined beauty shows up I am amazed again, though in a slightly different way.

I do have those eight positions though which helps, and also EQ for fine tuning, and these definitely widen the scope of tubes that can work and work together here.

Hope the tube lives on!


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