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post #33586 of 33593
Quote:
Originally Posted by isquirrel View Post

The Elrog is a more sensitive tube for sure. The consensus is that the weakness is in the bases. So if you have them in and they are working okay its probably best to leave them that way.

I don't know if I accept that, the entire point of tube amp is tube rolling.  I too taken great care when I roll my tubes, always waited for them to cool down before removing.  I also wear cotton glove so I don't get any skin oil on them.  I think Elrog should recall the tubes and fix the bases if that turns out to be the problem, or extend the warranty period to 2 years.

post #33587 of 33593
Quote:
Originally Posted by Sko0byDoo 

What's exactly the problem with the Elrogs?  I'm burning mine in right now.  Just wanna know what problem to keep my eyes for.  It's a shame, the Elrogs do sound great (better than EML 300xls).  

One thing about tubes with throated tungsten filaments are very sensitive to voltage and vibration.

Over voltage will cause them to loose emission rather quickly. and vibration or shock will cause

the filament to break after it was used it becomes brittle.

Skoob you build your own amps it would be a good idea if you use a slow turn on regulator to bring

the voltage up slowly.  And then run them at 4.5 to 4.75 volts instead of 5. I do this with my #10 drivers

run them at 7 volts instead of 7.5  and they have been used every day for 10 years and still test as new. 

post #33588 of 33593
Quote:
Originally Posted by 2359glenn View Post
 

One thing about tubes with throated tungsten filaments are very sensitive to voltage and vibration.

Over voltage will cause them to loose emission rather quickly. and vibration or shock will cause

the filament to break after it was used it becomes brittle.

Skoob you build your own amps it would be a good idea if you use a slow turn on regulator to bring

the voltage up slowly.  And then run them at 4.5 to 4.75 volts instead of 5. I do this with my #10 drivers

run them at 7 volts instead of 7.5  and they have been used every day for 10 years and still test as new. 

 

Glenn,

 

I noted that with my passive Rod Coleman's filament DC supply, for normal 300Bs, I set to get 5V.  At the same setting, for the Elrogs, I got +6.5V over the filament.  So, I will have to keep in mind to turn down the voltage for 'em.  

 

Yes, I do already have 20-30 sec B+ delay (from eBay).  I set 'em at 5V now, but will lower to 4-5-4.75V.  Thanks for the tips, Glenn.  The Elrogs do sound amazing.         


Edited by Sko0byDoo - Yesterday at 7:24 pm
post #33589 of 33593
Quote:
Originally Posted by Sko0byDoo View Post
 
Quote:
Originally Posted by 2359glenn View Post
 

One thing about tubes with throated tungsten filaments are very sensitive to voltage and vibration.

Over voltage will cause them to loose emission rather quickly. and vibration or shock will cause

the filament to break after it was used it becomes brittle.

Skoob you build your own amps it would be a good idea if you use a slow turn on regulator to bring

the voltage up slowly.  And then run them at 4.5 to 4.75 volts instead of 5. I do this with my #10 drivers

run them at 7 volts instead of 7.5  and they have been used every day for 10 years and still test as new. 

 

Glenn,

 

I noted that with my passive Rod Coleman's filament DC supply, for normal 300Bs, I set to get 5V.  At the same setting, for the Elrogs, I got +6.5V over the filament.  So, I will have to keep in mind to turn down the voltage for 'em.  

 

Yes, I do already have 20-30 sec B+ delay (from eBay).  I set 'em at 5V now, but will lower to 4-5-4.75V.  Thanks for the tips, Glenn.  The Elrogs do sound amazing.         


This could be the problem the Elrogs draw less filament current then a normal 300B.

So in a amp that uses resistors in the filament power supply less current draw means higher voltage to the tube.

This will kill a throated tungsten tube.

post #33590 of 33593
Quote:
Originally Posted by Khragon View Post
 

I don't know if I accept that, the entire point of tube amp is tube rolling.  I too taken great care when I roll my tubes, always waited for them to cool down before removing.  I also wear cotton glove so I don't get any skin oil on them.  I think Elrog should recall the tubes and fix the bases if that turns out to be the problem, or extend the warranty period to 2 years.


Stating the obvious perhaps however the entire point of a tube amp is to listen to music :wink_face: not all users tube roll extensively or at all.

 

We are all waiting/hoping that Elrog will get on top of this and respond in a timely manner. I sent the Elrog tube specs to Jack Woo who responded saying they were quite safe to run in his amps. Whatever the issue is it would be nice if there was a long term solution.

 

Best suggestion is to contact the supplier and find out what is the latest status.

post #33591 of 33593
Quote:
Originally Posted by isquirrel View Post
 
Quote:
Originally Posted by Khragon View Post
 

I don't know if I accept that, the entire point of tube amp is tube rolling.  I too taken great care when I roll my tubes, always waited for them to cool down before removing.  I also wear cotton glove so I don't get any skin oil on them.  I think Elrog should recall the tubes and fix the bases if that turns out to be the problem, or extend the warranty period to 2 years.


Stating the obvious perhaps however the entire point of a tube amp is to listen to music :wink_face: not all users tube roll extensively or at all.

 

We are all waiting/hoping that Elrog will get on top of this and respond in a timely manner. I sent the Elrog tube specs to Jack Woo who responded saying they were quite safe to run in his amps. Whatever the issue is it would be nice if there was a long term solution.

 

Best suggestion is to contact the supplier and find out what is the latest status.


What you guys should do is put in Elrogs and get a DVM and measure the filament voltage. Across the two large pins

it should be 5 volts usually DC if it is higher your amp is burning up these tubes. Then don't use Elrogs in that amp or

have some means of dropping it to 5 volts.

post #33592 of 33593
Quote:
Originally Posted by 2359glenn View Post
 


What you guys should do is put in Elrogs and get a DVM and measure the filament voltage. Across the two large pins

it should be 5 volts usually DC if it is higher your amp is burning up these tubes. Then don't use Elrogs in that amp or

have some means of dropping it to 5 volts.


Good advice as always, thanks Glenn

post #33593 of 33593
Quote:
Originally Posted by 2359glenn View Post
 


What you guys should do is put in Elrogs and get a DVM and measure the filament voltage. Across the two large pins

it should be 5 volts usually DC if it is higher your amp is burning up these tubes. Then don't use Elrogs in that amp or

have some means of dropping it to 5 volts.

 

Be safe, power on but remove the rectifier tube(s) when measure across the filament so no B+ on plate.

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