The most important design consideration before starting to build a tube amplifier is the fact that the quality of the power supplies is critical.
Here my schematics for a very good design published in the french electronic magazine LED.
R105 and R102 vor 30V between V105 and V121.
R111 - R113 with 5mA for the output voltage: fine adjust with R109.
For preamplifier, amplifier (>500VDC).
Here my schematics for a very good design published in the french electronic magazine LED.
R105 and R102 vor 30V between V105 and V121.
R111 - R113 with 5mA for the output voltage: fine adjust with R109.
For preamplifier, amplifier (>500VDC).
Attachments
Hi Bitrex,
UNITED CHEMI-CON ESMH160VSN104MA80T
http://de.farnell.com/jsp/search/productdetail.jsp?sku=1682019&_requestid=649756
15,90€
UNITED CHEMI-CON ESMH160VSN104MA80T
http://de.farnell.com/jsp/search/productdetail.jsp?sku=1682019&_requestid=649756
15,90€
I think I'm understanding the schematic - it's two series regulators in uh, series The 2N3439 is a battery-supplied current source load for the IRF740 error amplifier, and the 2SK30AGR is a source follower that buffers the error amp's output to the gate of the IRF740. The BZX zeners are there to protect the mosfet's gate-source junction from getting blown on transients, right?
great Bitrex, you are right. Very short response, very low ripple, very low impedance...
I try to find some Fets with integrated zener diode (ST).
As I wrote, I will translate the original article this weekend.
I am waiting for the PCBs and then measurements... Results coming soon!
I am not satisfied with this good design. I think about a LifePO4 Batterie supply: the blancing electronic is designed but I am worry about the charger... but I will find a solution, elegant but not cheap!
LifePO4 Battpack $6000 and $1500 for the charger. I will built it cheaper!
I try to find some Fets with integrated zener diode (ST).
As I wrote, I will translate the original article this weekend.
I am waiting for the PCBs and then measurements... Results coming soon!
I am not satisfied with this good design. I think about a LifePO4 Batterie supply: the blancing electronic is designed but I am worry about the charger... but I will find a solution, elegant but not cheap!
LifePO4 Battpack $6000 and $1500 for the charger. I will built it cheaper!
Thank you Jean Paul.
Some thoughts:
Consider the possibility to change C105 to be C of 470µF, then small value R, then C of 470µF. This simple CRC can work very well as a first stage filter.
S201 is always off ! Surely change to use terminals 4 and 5. This way becomes an on / off switch. I think this is your intention.
If any 'mains' contamination appears on the ground when you connect source equipment then consider deletion of C204 and C205 'mains filter' capacitors. Explanation: On some source equipment with a two-wire mains lead (example; some CD players) the down-stream equipment can suffer ground issues if C204 and C205 are included. This is 'application specific' and something to keep in mind when connecting the system.
To analog_sa ... I guess C107 is small because it works in conjunction with very large resistor R106 (4,700,000 Ohms) resulting in cut-off of approximately 0.35 Hz.
Some thoughts:
Consider the possibility to change C105 to be C of 470µF, then small value R, then C of 470µF. This simple CRC can work very well as a first stage filter.
S201 is always off ! Surely change to use terminals 4 and 5. This way becomes an on / off switch. I think this is your intention.
If any 'mains' contamination appears on the ground when you connect source equipment then consider deletion of C204 and C205 'mains filter' capacitors. Explanation: On some source equipment with a two-wire mains lead (example; some CD players) the down-stream equipment can suffer ground issues if C204 and C205 are included. This is 'application specific' and something to keep in mind when connecting the system.
To analog_sa ... I guess C107 is small because it works in conjunction with very large resistor R106 (4,700,000 Ohms) resulting in cut-off of approximately 0.35 Hz.
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