Tweakin' and attemptin' and learnin'...
Here are sweeps of increasing gain comparing a 4:1 Jensen output with a 3:1 Peluso (Tamura) output with 600 ohm (actually 650) termination. A few questions:
1. Is the decrease in frequency response indicative of the ratio difference? E.g., The circuit can't drive the 3:1 transformer into 600 as well as the 4:1 at higher gain? The high and low frequency rolloff gets worse when the Peluso is strapped for 2:1 and 1:1.
2. Is there a way to modify the 12BH7 WCF to give more drive to the 3:1? Or, is there a better option in this position? SRPP? ECC99? Something else?
Here are sweeps of increasing gain comparing a 4:1 Jensen output with a 3:1 Peluso (Tamura) output with 600 ohm (actually 650) termination. A few questions:
1. Is the decrease in frequency response indicative of the ratio difference? E.g., The circuit can't drive the 3:1 transformer into 600 as well as the 4:1 at higher gain? The high and low frequency rolloff gets worse when the Peluso is strapped for 2:1 and 1:1.
2. Is there a way to modify the 12BH7 WCF to give more drive to the 3:1? Or, is there a better option in this position? SRPP? ECC99? Something else?