khstudio
Well-known member
I just used the Edcor XSM Transformers in my LA2A.
Everything in the circuit is CORRECT!
I've checked & rechecked several times.
NOTE: I'm using the DRIP v2 PCB's for this build.
ALSO, notice the ROLL-OFF starting under 1k.
It's definitely NOT the adjustable cap, C4!
C4 is set to 150pf for ALL the Pics Below (except my original)
INPUT = XSM 10k:10k
OUTPUT = XSM 10k:600
When I was sweeping it with RMAA I got VERY strange LOW END behavior. :?
My first 2 LA2A's used JENSEN Tranny's... same RATIO's for I/O & they look & work fine!
I was able to tame it down to normal by putting an 11k resistor on the OT's Primary & a 600 ohm across the secondary.
Here it is LOADED with JUST the 600 ohm on the secondary:
this is not normal...
I've read a lot of you guys use these tranny's but never read about this, loading or any problems like this.
And more important, what could be causing the HIGHs to start rolling off so early?
PLEASE HELP! :sad:
Everything in the circuit is CORRECT!
I've checked & rechecked several times.
NOTE: I'm using the DRIP v2 PCB's for this build.
ALSO, notice the ROLL-OFF starting under 1k.
It's definitely NOT the adjustable cap, C4!
C4 is set to 150pf for ALL the Pics Below (except my original)
INPUT = XSM 10k:10k
OUTPUT = XSM 10k:600
When I was sweeping it with RMAA I got VERY strange LOW END behavior. :?
My first 2 LA2A's used JENSEN Tranny's... same RATIO's for I/O & they look & work fine!
I was able to tame it down to normal by putting an 11k resistor on the OT's Primary & a 600 ohm across the secondary.
Here it is LOADED with JUST the 600 ohm on the secondary:
this is not normal...
I've read a lot of you guys use these tranny's but never read about this, loading or any problems like this.
And more important, what could be causing the HIGHs to start rolling off so early?
PLEASE HELP! :sad: