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Tube function in Audio Experiences Symphonies

H

hpm-1000

Member
Hi,

I have an audio experiences symphonies pre-amplifier, it uses one 6x4 rectifier tube and 3 12ax7/ecc83 tubes.

I wonder wich tubes have more to say in the overall sound, is it the 3 12ax7 or the rectifier tube? anyone familiar with this pre-amp?

The 3 12ax7 I got are 2 NOS telefunken smooth plate, one new production mullard and one NOS philco 12ax7. i am now using 2 telefunken in each side and the mullard in the middle, i havent tried the NOS philco yet. I dont really understand whats the function of each tube in the different position and wich position has more to say in the overall sound...?

In the rectifier position i have an NOS tung sol, one matshushita, one jan philips and one NOS philips miniwatt. Anyone familiar with this tubes and their different sound characteristics? I believe the miniwatt sounds best.

I am aware that experimentation will reveal the best combination of tubes but i wonder if there is someone out there familiar with this pre-amp and what do they think

thank you in advance!:smoke:
 
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hpm-1000 said:
Hi,

I have an audio experiences symphonies pre-amplifier, it uses one 6x4 rectifier tube and 3 12ax7/ecc83 tubes.

I wonder which tubes have more to say in the overall sound, is it the 3 12ax7 or the rectifier tube?
Click to expand...

The 12AX7s have the big impact to create the tube sound. Though some will debate it, tube rectifiers won't contribute to the tube sound. If tube rectifiers did have a big impact, you could build a SS amp with a tube rectifier and have it sound like tubes?
 
hpm-1000 said:
Hi,

I have an audio experiences symphonies pre-amplifier, it uses one 6x4 rectifier tube and 3 12ax7/ecc83 tubes.

I wonder wich tubes have more to say in the overall sound, is it the 3 12ax7 or the rectifier tube? anyone familiar with this pre-amp?

The 3 12ax7 I got are 2 NOS telefunken smooth plate, one new production mullard and one NOS philco 12ax7. i am now using 2 telefunken in each side and the mullard in the middle, i havent tried the NOS philco yet. I dont really understand whats the function of each tube in the different position and wich position has more to say in the overall sound...?

In the rectifier position i have an NOS tung sol, one matshushita, one jan philips and one NOS philips miniwatt. Anyone familiar with this tubes and their different sound characteristics? I believe the miniwatt sounds best.

I am aware that experimentation will reveal the best combination of tubes but i wonder if there is someone out there familiar with this pre-amp and what do they think

thank you in advance!:smoke:
Click to expand...








I own one , 6X4 rolling wont change the sound any , the unit has a regulated power supply after it . The active circuitry is a near clone of a Marantz 7 line stage , the two outer 12AX7's are the two gain stages, and the center tube is two cathode followers ,one for each channel .

I changed all the electrolytic caps in the power supply , the originals had a very high failure rate . I also added some bypass caps to it .

I settled for two GE 12AX7's selected for low noise and microphonics , for the gain stages and a GE 5751 for the cathode follower .

http://www.classicvalve.ca/docs/PAS_7c_Line_docs.pdf

this is a basic schematic of the line stage
 
battradio said:







I own one , 6X4 rolling wont change the sound any , the unit has a regulated power supply after it . The active circuitry is a near clone of a Marantz 7 line stage , the two outer 12AX7's are the two gain stages, and the center tube is two cathode followers ,one for each channel .

I changed all the electrolytic caps in the power supply , the originals had a very high failure rate . I also added some bypass caps to it .

I settled for two GE 12AX7's selected for low noise and microphonics , for the gain stages and a GE 5751 for the cathode follower .

http://www.classicvalve.ca/docs/PAS_7c_Line_docs.pdf

this is a basic schematic of the line stage
Click to expand...

So, the outer 12ax7 should be the same right? i have the two telefunken in those positions and one mullard in the middle. have an extra philco but never used it
 
hpm-1000 said:
So, the outer 12ax7 should be the same right? i have the two telefunken in those positions and one mullard in the middle. have an extra philco but never used it
Click to expand...

Correct , the two outers one make more of a difference and should be the same .
 
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