Output Transformer for L3 pre Audio Note

[jolieaudio]

Please help me how much is parameters of volt at pin 9 (5687 tube) ? with schematic following:
After connecting to OPT for L3 AN. Because I make it myself...

Volt at pin 9 (TX) W35,W37???
Thanks

 

[euro21]

L3 preamp contains M2 PSU.

Audio Note Kits - M2 Power Supply Support

 

[jolieaudio]

L3 preamp contains M2 PSU.

Audio Note Kits - M2 Power Supply Support

Thank you for your reply. I used this M2, but I want to know the exact volt of TX position , after opt connected this (Tx) position, another wire of opt connected to B+(260v) in M2.

 

[euro21]

"But the M3 or L3 is feeding a 260 DCV to the output transformer's HT point, after the winding resistance, at least 230 DCV or above."

http://www.diyaudio.com/forums/tube...n-audio-note-m10-schematic-japan-version.html

 

[jolieaudio]

"But the M3 or L3 is feeding a 260 DCV to the output transformer's HT point, after the winding resistance, at least 230 DCV or above."

http://www.diyaudio.com/forums/tube...n-audio-note-m10-schematic-japan-version.html

Great. Up to now, my kit is 255 DCV, the winding resistance is about 565ohm. Is it right? I feel high gain, Can you show me how to reduce gain at this situation.
Thanks a lot

 

[jolieaudio]

My kit is here, and double C-CORE with the winding resistance is about 565ohm. Tx position is about 255 VDC. Is it all right?

 

[euro21]

High gain?

Audio Note L3 Line Pre-Amplifier Kit
"Specifications

Input Impedance 100K
Input Sensitivity 126mV
Gain x8 (single ended mode), x16 (balance mode)
Valve Complement 2x 5687 (line stage) 1x 6X5, 1x ECL82(PSU)
Chassis dimensions 38.1cm(15") wide, 40.64cm(16") back to front, 14.6cm(5.75") height including height from floor"

I believe, your transformer is not 33:1 step-down version.
Audio Note pre-amplifier output transformers

 

[Vincin]

take out cathode caps in the first 5687 stage and/or lower the anode resistor of that stage.

 

[kevinkr]

Try it first and see if you have a problem before making modifications that may result in lousy performance. The SE gain is 18dB which is not too extreme..

 

[jolieaudio]

Thanks all of you. I will do it and make an anouncement to you.

 

[Vincin]

the ANK OPT (which are no longer the AN made ions) may not be the 33:1 step down, something like 28:1.

This pre gives only 8-10 times voltage gain only depending on the tube combo used (5687, 7044, e182cc, 6463, ecc82, 12bh7, 6sn7, ecc99...), not excessively high.

you may want to address the gain of your system in the source or power amp ie: AN DAC to L3 pre to classic 6sn7-6sn7-300b is definitely too much gain.

 

[jolieaudio]

Your idea is so great. And now, My kit used volume not over 3h, sound is extremely loud. If I increase the wiring resistance of primary, and decrease the wiring resistance of secondary .I feel weak sound, lacking of dynamic and detailed sound.With "something like 28:1". I tried to do it , the result is medium gai, but sound not so great...

 

[jolieaudio]

I see Schematic of Pre L3 and DAC , R1 and R11 have differences. Value of R1 and R11 = 470K, and DAC 3k3. Can you explain these position, please.?