Hi gentlemen,
After an 8+ years pause, I've decided to resume my low voltage aikido hpa project based on Mr. Broskie Aikido 24Volts pcb. (I chose 48V B+, 12BH7 route)
However, I have two questions for you guys:
First one: In the manual it is stated
Since I'm using 12BH7 valves, I'm guessing I should use capacitor in C5&C6 position right ? However, can someone could explain me why those capacitors have been removed from the part list for the 12BH7 build ? A mistake ? Should I use them or not ?
My other question is about the headphone output. Mr. Broskie is suggesting LM317/LM350/LT1085. Will I run into problems using those parts since they're limited to 30-35V differential ? (I'm using 48v B+) Would LM317HV be more suitable ?
Here's the shematic on which my pcb is based on:
24V Aikido Line Stage and Headphone Amplifier
Thanks a lot for your help
After an 8+ years pause, I've decided to resume my low voltage aikido hpa project based on Mr. Broskie Aikido 24Volts pcb. (I chose 48V B+, 12BH7 route)
However, I have two questions for you guys:
First one: In the manual it is stated
Internal Shields If the triode’s pin 9 attaches to an internal shield, as it does with the 6CG7, 6DJ8, 6GM8/ECC86, and 6H30, then capacitors, C5 and C6 can be replaced with a jumper wire, which will directly ground the shield. However, using capacitors will also ground the shield (in AC terms) and allow using triodes whose pin-9 attaches to the center tap of its heater, such as the 12BH7
Since I'm using 12BH7 valves, I'm guessing I should use capacitor in C5&C6 position right ? However, can someone could explain me why those capacitors have been removed from the part list for the 12BH7 build ? A mistake ? Should I use them or not ?
My other question is about the headphone output. Mr. Broskie is suggesting LM317/LM350/LT1085. Will I run into problems using those parts since they're limited to 30-35V differential ? (I'm using 48v B+) Would LM317HV be more suitable ?
Here's the shematic on which my pcb is based on:
24V Aikido Line Stage and Headphone Amplifier
Thanks a lot for your help