[doordie97]

I’m pretty sure it’s from the power tubes not from the headphones... tried every possible combination of unplugging and plugging in but the crackle is still present... audible from the power tubes

So guys, any insight on this. I’ve read the previous threads and I’m pretty sure it’s not RF noise, it comes from the tubes themselves and it’s not audible in my headphones. Thanks guys

 

[willne1]

It might be a long shot but did you check the pins on the tubes to make sure they're clean of any corrosion?

 

[doordie97]

It might be a long shot but did you check the pins on the tubes to make sure they're clean of any corrosion?

Did check them out they seem to be fine. Doesn’t corrosion affect the overall sound as well? The sound is fine, just that there are crackling noises from the tubes after I turn it off, lasts for about 10-15 seconds... could it be a grounding issue?

 

[gibosi]

I wonder if what you are hearing is similar to the sounds a hot automobile engine makes after it is turned off, those popping and tinkling sounds. In a similar way, as tubes cool down, the metal components inside begin to contract. And as they cool down and contract, they need to move a bit, relative to each other, but some pieces are joined together. So as they begin to cool down, tension builds up until one piece suddenly slips against another piece. And as they slip-and-catch, slip-and-catch, we hear pops and tinkling sounds.

Obviously, some tubes are more prone to this than others. In a different amp, the 5998, which is an enhanced version of the 6AS7, is notorious for these popping and tinkling sounds, both as it heats up and as it cools down.

So if this is what you are hearing, then it is perfectly normal, nothing to worry about....

 

[mordy]

I wonder if what you are hearing is similar to the sounds a hot automobile engine makes after it is turned off, those popping and tinkling sounds. In a similar way, as tubes cool down, the metal components inside begin to contract. And as they cool down and contract, they need to move a bit, relative to each other, but some pieces are joined together. So as they begin to cool down, tension builds up until one piece suddenly slips against another piece. And as they slip-and-catch, slip-and-catch, we hear pops and tinkling sounds.

Obviously, some tubes are more prone to this than others. In a different amp, the 5998, which is an enhanced version of the 6AS7, is notorious for these popping and tinkling sounds, both as it heats up and as it cools down.

So if this is what you are hearing, then it is perfectly normal, nothing to worry about....

Hi d97,
Just to cover all bases, take a dull little knife and gently scrape the tube pins all around. Many times the various sounds from the tube disappear after burning in the the tubes - usually in the 30-50 hour range.

 

[Whelkie D]

I've had this with newly installed NOS tubes. Odd clicks and pops. With me these have disappeared after burn-in of 15 - 20 hours. I think it is just bits of oxidisation on the pins which "burns off" after a bit of use.

 

[doordie97]

I've had this with newly installed NOS tubes. Odd clicks and pops. With me these have disappeared after burn-in of 15 - 20 hours. I think it is just bits of oxidisation on the pins which "burns off" after a bit of use.

Thanks for the info man, at least now i know what i'm dealing with. Cheers

 

[doordie97]

Any 6hm5 listing recommendations? thanks should i go for the yugoslavian ones or the general electric ones. both are tall tubes what is the difference. Thanks again guys you peeps are awesome

 

[mordy]

Hi d97,
I have the Yugoslavian Ei tubes and they are very good. Here is a seller that will sell you a pair for $14 shipped:
https://www.ebay.com/itm/6HM5-6HA5-...467071?hash=item460dd0523f:g:UJ0AAOxyyF5RN3~H

 

[sghound]

Any 6hm5 listing recommendations? thanks should i go for the yugoslavian ones or the general electric ones. both are tall tubes what is the difference. Thanks again guys you peeps are awesome

yugo tall boy

 

[doordie97]

Hi d97,
I have the Yugoslavian Ei tubes and they are very good. Here is a seller that will sell you a pair for $14 shipped:
https://www.ebay.com/itm/6HM5-6HA5-...467071?hash=item460dd0523f:g:UJ0AAOxyyF5RN3~H

thanks mordy. Appreciate it. will get them ASAP

 

[TrollDragon]

Did someone say Yugo...

 

[mordy]

Did someone say Yugo...

Hi TD,
The first time I used the Yugo Ei 6HM5 I thought my amp was going to blow up because of the flash from the pre-heat feature of these tubes......
Nothing to worry about, though.

 

[shepperd]

I had the same experience and they got so hot I stopped using them. I just found these, which I had never seen before. Anyone heard them? https://www.ebay.com/p/Ei-6HA5-EC900-Vintage-Tube/168051561?iid=362168495484

 

[Johnybuchar]

Hi Shepperd,
I bought these little 6AH5 from the Yugoslavia. They sound a little bright with my LD3+Shure940. I usually put them if I have a taste to listen vocal and instrumental music. They light up like a comet after turning on . High recommendations.