Dear Group
I have an analog tube compressor that came with 2 Edcor XSM 600/600 input transformers.
The wiring is as follows:
INPUT > PRI : Pin 1=(+) / Pin 2=(C.T.) / Pin 3=(-)
OUTPUT > SEC : Pin 5=(+) / Pin 6=(C.T.) to Attack Wiper / Pin 8=(-)
I don't like really the sound of the Edcor. As I find in vintage transformers a nice low end sound, I am trying to implement 2 very old trafos I have that sound lovely. They have 9 pin and the ohmmeter reads:
Pin • / Pin 2 = 27
Pin 3 / Pin 4 = 29.4
Pin 5 / Pin 6 = 11.5
Pin 7 / Pin 8 = 31.8
Pin 8 / Pin 9 = 34.1
A model of the same transformer I found on the internet states in the label:
Output TF 1A 13
FREQ (.2 - 4.0) KC
Pin • / Pin 2 = 0.15 K 0MA
Pin 3 / Pin 4 = 0.15 K 0MA
Pin 5 / Pin 6 = 0.15 K 50MA
Pin 7 / Pin 9 = 0.6 K 0MA
Pin 8 = C.T.
My transformers do not have that label printed in it. Information is practically non existent on the net.
What I tried?
1)
INPUT / PRI
Pin •= (+)
Pin 2 + Pin 3 linked
Pin 4= (-)
OUTPUT / SEC
Pin 5 = (+)
Pin 6 + Pin 7 linked
Pin 8 = C.T. to Attack Wiper
Pin 9 = (-)
Result: Total Low End Loss.
2)
INPUT / SEC
Pin 5 = (+)
Pin 6 + Pin 7 linked
Pin 8 = C.T. Floating
Pin 9 = (-)
OUTPUT / PRI
Pin • = (+)
Pin 2 = (-)
Pin 3 = Attack Wiper
Pin 4= Floating
Results: Good, but with Output gain loss. Is necessary then to set the Compressor Level to the max. +8dB and the threshold to infinite to have slightly -1dB GR.
Any thoughs?
Thanks in advance!
I have an analog tube compressor that came with 2 Edcor XSM 600/600 input transformers.
The wiring is as follows:
INPUT > PRI : Pin 1=(+) / Pin 2=(C.T.) / Pin 3=(-)
OUTPUT > SEC : Pin 5=(+) / Pin 6=(C.T.) to Attack Wiper / Pin 8=(-)
I don't like really the sound of the Edcor. As I find in vintage transformers a nice low end sound, I am trying to implement 2 very old trafos I have that sound lovely. They have 9 pin and the ohmmeter reads:
Pin • / Pin 2 = 27
Pin 3 / Pin 4 = 29.4
Pin 5 / Pin 6 = 11.5
Pin 7 / Pin 8 = 31.8
Pin 8 / Pin 9 = 34.1
A model of the same transformer I found on the internet states in the label:
Output TF 1A 13
FREQ (.2 - 4.0) KC
Pin • / Pin 2 = 0.15 K 0MA
Pin 3 / Pin 4 = 0.15 K 0MA
Pin 5 / Pin 6 = 0.15 K 50MA
Pin 7 / Pin 9 = 0.6 K 0MA
Pin 8 = C.T.
My transformers do not have that label printed in it. Information is practically non existent on the net.
What I tried?
1)
INPUT / PRI
Pin •= (+)
Pin 2 + Pin 3 linked
Pin 4= (-)
OUTPUT / SEC
Pin 5 = (+)
Pin 6 + Pin 7 linked
Pin 8 = C.T. to Attack Wiper
Pin 9 = (-)
Result: Total Low End Loss.
2)
INPUT / SEC
Pin 5 = (+)
Pin 6 + Pin 7 linked
Pin 8 = C.T. Floating
Pin 9 = (-)
OUTPUT / PRI
Pin • = (+)
Pin 2 = (-)
Pin 3 = Attack Wiper
Pin 4= Floating
Results: Good, but with Output gain loss. Is necessary then to set the Compressor Level to the max. +8dB and the threshold to infinite to have slightly -1dB GR.
Any thoughs?
Thanks in advance!
Last edited:
INPUT / PRI
Pin •= (+)
Pin 2 + Pin 3 linked
Pin 4= (-)
OUTPUT > SEC : Pin 7=(+) / Pin 9=(C.T.) to Attack Wiper / Pin 8=(-)
Thanks Simon, it makes sense. Appreciate it
Last edited:
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