khstudio
Well-known member
Thanks to Joel (JC) and you guys here :thumb:
It sounds great & was a lot of work & research. I etched the PCB myself + made the faceplate from scratch using the Lazer printer/77 glue.
You may notice a few things in the pics like tranny bolt missing & some grounds cliped... this is because I'm tracking down HUMMMMMMMMMMM.
Input trannys are the L31267's, JLM ACDC PS + JLM DI on ch1, LO1166 OT, 25VA PT.
The extra jacks on the front will be connected to the extra taps on the input tranny AFTER I get rid of the HUM.
----------------------------------------------------
I've been talking with Joel over the phone for a few days & have decided to go with his "JC's 2-Stage 1272 Pre-amp Design".
Better, Cheaper, Faster...
No need for a separate BA283 card (which are sold out), EDGE connector, Hot-Rod or expensive Gain switch.
*NOTE There is no 5k gain control between the stages but can be easily added (check out the JLM Hotrod Schematic) I will be adding this to mine.
I may also design a small PCB for the gain switch (Lorlin 2x6)
& possibly a basic +24/+48 supply board. If anyone has one, or a link to one, please let me know.
Refference LINKS:
http://jlmaudio.com/neve_BA283.htm
http://jlmaudio.com/JLM1272simplemod.pdf
http://jlmaudio.com/JLM1272hotrodmod.pdf
Wiring 31267 as 10468 - JLM
http://jlmaudio.com/Neve%20transformer%20info.htm
31267 trafo in 1272 clone problems..
http://www.groupdiy.com/index.php?topic=7126
Type 1272 Preamp with JLM Hotrod Mod and BA283AV (Pics)
http://www.groupdiy.com/index.php?topic=17697
Hotrod Build Thread
http://www.groupdiy.com/index.php?topic=15373
Fabios 1272 finished
http://www.groupdiy.com/index.php?topic=18448
How Do I Wire A 31267?
http://www.groupdiy.com/index.php?topic=19107
1272 - why a step down transformer
http://www.groupdiy.com/index.php?topic=17537
1272 LINE INPUT ?
http://www.groupdiy.com/index.php?topic=14218
Any one used 31267 as a substitute for a 10468 successfully?
http://www.groupdiy.com/index.php?topic=14046
Geoff Tanner
http://www.auroraaudio.net/main.shtml
Thanks,
Kevin
It sounds great & was a lot of work & research. I etched the PCB myself + made the faceplate from scratch using the Lazer printer/77 glue.
You may notice a few things in the pics like tranny bolt missing & some grounds cliped... this is because I'm tracking down HUMMMMMMMMMMM.
Input trannys are the L31267's, JLM ACDC PS + JLM DI on ch1, LO1166 OT, 25VA PT.
The extra jacks on the front will be connected to the extra taps on the input tranny AFTER I get rid of the HUM.
----------------------------------------------------
I've been talking with Joel over the phone for a few days & have decided to go with his "JC's 2-Stage 1272 Pre-amp Design".
Better, Cheaper, Faster...
No need for a separate BA283 card (which are sold out), EDGE connector, Hot-Rod or expensive Gain switch.
*NOTE There is no 5k gain control between the stages but can be easily added (check out the JLM Hotrod Schematic) I will be adding this to mine.
I may also design a small PCB for the gain switch (Lorlin 2x6)
& possibly a basic +24/+48 supply board. If anyone has one, or a link to one, please let me know.
Refference LINKS:
http://jlmaudio.com/neve_BA283.htm
http://jlmaudio.com/JLM1272simplemod.pdf
http://jlmaudio.com/JLM1272hotrodmod.pdf
Wiring 31267 as 10468 - JLM
http://jlmaudio.com/Neve%20transformer%20info.htm
31267 trafo in 1272 clone problems..
http://www.groupdiy.com/index.php?topic=7126
Type 1272 Preamp with JLM Hotrod Mod and BA283AV (Pics)
http://www.groupdiy.com/index.php?topic=17697
Hotrod Build Thread
http://www.groupdiy.com/index.php?topic=15373
Fabios 1272 finished
http://www.groupdiy.com/index.php?topic=18448
How Do I Wire A 31267?
http://www.groupdiy.com/index.php?topic=19107
1272 - why a step down transformer
http://www.groupdiy.com/index.php?topic=17537
1272 LINE INPUT ?
http://www.groupdiy.com/index.php?topic=14218
Any one used 31267 as a substitute for a 10468 successfully?
http://www.groupdiy.com/index.php?topic=14046
Geoff Tanner
http://www.auroraaudio.net/main.shtml
Thanks,
Kevin