dukasound
Well-known member
I finish my C800G :grin: .
That works!!!!!.
I make PSU with 6X4 tube and stabilized voltage for heaters. I use two zeners (110V+120V with 0,1uF poly in parallel), three caps (first 10uF and 100uF others) and two 10K resistors.
I saw 240V when microphone is connected????
Other voltages:
Plate and grids: 64V with 100K plate resistor
Cathode: 1,78V
Heaters: 5,7V
Capsule: 47,2V.
I used Russian 6AU6, Soundking 106 capsule and Lundahl LL1577, wired 7:1.
Single mesh.
Tube is out of aluminium body (like on original C800G). I made one aluminium cover to protect tube.
Also I haven big caps and I use one 3300uF near heaters.
On first listening I hear less low than my AKG414EB. Microphone is very sensitive.
Not big noise (higher than 414) and no hum.
Questions:
Is plate voltage low (on original 90V)?
Cathode voltage is (1,78V)higher than on original (1,4V)?
Soon pics!!!!!!!!
That works!!!!!.
I make PSU with 6X4 tube and stabilized voltage for heaters. I use two zeners (110V+120V with 0,1uF poly in parallel), three caps (first 10uF and 100uF others) and two 10K resistors.
I saw 240V when microphone is connected????
Other voltages:
Plate and grids: 64V with 100K plate resistor
Cathode: 1,78V
Heaters: 5,7V
Capsule: 47,2V.
I used Russian 6AU6, Soundking 106 capsule and Lundahl LL1577, wired 7:1.
Single mesh.
Tube is out of aluminium body (like on original C800G). I made one aluminium cover to protect tube.
Also I haven big caps and I use one 3300uF near heaters.
On first listening I hear less low than my AKG414EB. Microphone is very sensitive.
Not big noise (higher than 414) and no hum.
Questions:
Is plate voltage low (on original 90V)?
Cathode voltage is (1,78V)higher than on original (1,4V)?
Soon pics!!!!!!!!