To prevent me from soiling the GB thread GB for Baby Huey PCB I'll be posting assorted pics here regarding my build.
The rounding of the board and the thickness makes for a very nice looking board.
The rounding of the board and the thickness makes for a very nice looking board.
Attachments
Last edited:
I've decided to use schottkeys for at least the bias supply diodes. Perhaps also for the main psu rectifiers.
https://www.st.com/resource/en/datasheet/stpsc2h12.pdf
They do need some bending to fit. And I'll have to devise something so they don't touch each other. Should be no problem if I check after assembly if they don't touch.
https://www.st.com/resource/en/datasheet/stpsc2h12.pdf
They do need some bending to fit. And I'll have to devise something so they don't touch each other. Should be no problem if I check after assembly if they don't touch.
Power supply capacitor under the board done because of proximity to one of the output valves....too close for comfort regarding heat.
Attachments
Last edited:
Hello Bas, Pl check the pins of tube against schematic.
I am not sure if marc (bandol83 ) intended to populate them from bottom side .
regards
prasi
I am not sure if marc (bandol83 ) intended to populate them from bottom side .
regards
prasi
Hi Prasi,
I populated the sockets from the top.
You gave me a big fright now. 😀
I used this picture as my guide. But looking at the pcb I have in my hand....and the sockets....and the pcb tracks.... all looks good.
Attachments
Last edited:
That looks good! Extremely Sorry to have given you a fright.
It was for the EL34 MK2 that marc intended to fit the tube from bottom.
All the best for build and listening.
It was for the EL34 MK2 that marc intended to fit the tube from bottom.
All the best for build and listening.
No worries Prasi. I could have made the mistake...and then it would have been great to know before....
Kind regards,
Bas
Kind regards,
Bas
Nice solution 🙂
But couldn't you find any bigger diodes for 10mA rectified current ? 😀
Mona
First test. Just the bias and powerdrive circuit.
Test was successful.
No smoke. No explosions. Led lit up.
Bias was easily set by the little potmeters. 53VDC on the tabs of the powerdrive mosfet. Got confirmation from Gingertube that this is sufficient for the EL84 version.
Test was successful.
No smoke. No explosions. Led lit up.
Bias was easily set by the little potmeters. 53VDC on the tabs of the powerdrive mosfet. Got confirmation from Gingertube that this is sufficient for the EL84 version.
Last edited:
With regard to the discrepancies between the board 1.6 and the schematic 1.6. I used these values.
For
R16=15K
R17=10K
as per Schematic 1.6.
R18=1K
as on the Rev. 1.6 pcb.
Ofcourse the proof of the pudding is in the eating. I'll follow up on this.
R13 is 33k now but will be doubled up with another 33k after listening so I'll end up with 16.5k. (Just so I can hear the change for myself)
For
R16=15K
R17=10K
as per Schematic 1.6.
R18=1K
as on the Rev. 1.6 pcb.
Ofcourse the proof of the pudding is in the eating. I'll follow up on this.
R13 is 33k now but will be doubled up with another 33k after listening so I'll end up with 16.5k. (Just so I can hear the change for myself)
Last edited:
Voltage across r18 is 1.056 volts. Perfect.
From member Planet IX
1,1/1000R=1.1mA
Measured is 1.056mA. So that each half of the triode is 0,5mA. Which is the target set by the designer.
From member Planet IX
1,1/1000R=1.1mA
Measured is 1.056mA. So that each half of the triode is 0,5mA. Which is the target set by the designer.
Last edited:
21st century maida regulator:
21st Century Maida Regulator
21st Century Maida Regulator: A modern B+ voltage regulator – Neurochrome
21st Century Maida Regulator
21st Century Maida Regulator: A modern B+ voltage regulator – Neurochrome
Attachments
