mrf0ster

New to Tubes, where to now.

30 posts in this topic

On 13/04/2017 at 11:42 AM, aussievintage said:

 

 

If you try secondhand, look out for the good old aussie brand  AWV.  They often look and sound like Mullards

 

 

+1 for old Australian made AWV / Miniwatt preamp tubes - i have been impressed by how they sound. Even have a few Australian made Mullard labelled tubes :-)

Edited by mkaramazov
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Another question. I have a phono pre amp that has 4 tubes that are exactly the same. Ie JJ gold something or rather. Is it wise to mix and match 2 tubes for the input, and then 2 different tubes for the output? So for example, let's just say 2 Mullards for the inputs, and let's say 2 different ones for the output? 

 

Is that a silly thing to do, or should they be all the same? 

 

Still learning lol ....

 

Cheers Mark 

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8 hours ago, mrf0ster said:

Another question. I have a phono pre amp that has 4 tubes that are exactly the same. Ie JJ gold something or rather. Is it wise to mix and match 2 tubes for the input, and then 2 different tubes for the output? So for example, let's just say 2 Mullards for the inputs, and let's say 2 different ones for the output? 

 

Is that a silly thing to do, or should they be all the same? 

 

Still learning lol ....

 

Cheers Mark 

 

 

Depends how it is constructed.  I like to use each half of each 12AX7 for one channel each, and so each 12AX7 is one stage in the amplification for both channels.    Alternatively you could wire it up so the left channel goes through one set of tubes and the right channel through the other.   You could also wire some of the 12AX7s with both halves in parallel - for less noise for each in the first amplification stages.  

 

That said, it won't hurt anything to mix and match.  Doing what you suggest also makes sense if you try to keep each amplification stage using the same tube type for each channel - the trick is identifying which tubes represent what.  Is your tube phono preamp a known brand, or based on a known design - maybe we can sort it out for you.

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29 minutes ago, aussievintage said:

 

 

Depends how it is constructed.  I like to use each half of each 12AX7 for one channel each, and so each 12AX7 is one stage in the amplification for both channels.    Alternatively you could wire it up so the left channel goes through one set of tubes and the right channel through the other.   You could also wire some of the 12AX7s with both halves in parallel - for less noise for each in the first amplification stages.  

 

That said, it won't hurt anything to mix and match.  Doing what you suggest also makes sense if you try to keep each amplification stage using the same tube type for each channel - the trick is identifying which tubes represent what.  Is your tube phono preamp a known brand, or based on a known design - maybe we can sort it out for you.

 

Hi Aussie, this is the link to the manual, and I have attached a picture also. It looks as though each tube does a in and out on each channel?

 

appreciate your help, it's interesting to learn all this. 

 

http://www.zestoaudio.com/blog/wp-content/uploads/2016/05/Andros1.2web-manual.pdf

 

 

IMG_1279.PNG

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Fair enough, then I would mix and match as pairs.  As long as inputs remain the same as each other,  and both outputs the same as each other as well.

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