-40%
DIY PCB Board Tube Amp Universal PS Power Supply HV with Neg Bias KT88 EL34 EL84
$ 10.56
- Description
- Size Guide
Description
This auction is forONE
bare PCB.
High Voltage:
50-900VDC @ 300mA
Negative Bias:
Adjustable up to -80V
High Voltage Circuit:
Multiple input options available. Options are tube rectified input, full wave bridge, full wave center tap, and full wave choke input.
Huge capacitance capability. Accepts series snap caps up to 30mm diameter.
All electrolytic caps are bypassed with a film cap for improved high frequency characteristics.
Configurable for up to 3 output voltages with standard configuration. Easiest setup is an input filter, then the B+ voltage, then one to two drops for the driver voltages.
Allows for external choke filter (C-L-C) or 5W voltage dropping resistor (C-R-C).
Accepts up to 4 external choke filters or voltage dropping resistors.
Two sets of outputs for each voltage and multiple ground pads.
Ridiculously quiet power with ultra low ripple.
Additional Features:
Perfect board to power any tube amp, especially KT-88 or EL34 push pull, 300B SET. Great match for a Dynaco clone (ie: use with Poseidon MKIII driver boards).
Use with or without negative bias circuit. Designed for bias tap type transformers (ie: Hammond 300 series or Dynaco P774 or P784) or use a separate bias supply.
Use the on-board pot or an external pot to adjust the bias.
A jumper location is provided to ground directly through one of the mounting screws to the chassis.
Designed for use with high end audio grade components (Wima MPK series, Nichicon, etc).
All this circuitry is smartly arranged on a 3.50” x 6.75” board.
Thick PCB with 2 ounce traces!!!
An example BOM from Mouser is below. I used all high end components (Wima, EPCOS, Nichicon Audio caps, etc). Full schematic and board layout are above. If you're handy you can wire one up point to point with all the info in this add and skip the need to buy the PCB. Please know your skill level and knowledge of electronics before considering this PCB. If Mouser is out of something try DigiKey. You should be comfortable specifying substitutions. In the BOM below I'd order everything except C1-C4 and D1-D4 for a Poseidon or other KT88/EL84 build. I've provided a Mouser direct link to make ordering easier. Occasionally the individual line items below become unavailable at Mouser. I do my best to keep the direct link BOM updated. You may notice a few substitutions as a result.
Mouser BOM is below. To access the BOM directly do a Google search for "Project & Cart Sharing". After following that link enter this project code:
a9ab3cfe3c
Part
Value
Mouser
Notes
C1
.01uF
505-M10.01/1000/10
Not used with Full Wave CT or Rectifier Tube
C2
.01uF
505-M10.01/1000/10
Not used with Full Wave CT or Rectifier Tube
C3
.01uF
505-M10.01/1000/10
Not used with Rectifier Tube
C4
.01uF
505-M10.01/1000/10
Not used with Rectifier Tube
C7
.22uF
505-MKP4J032204JKSSD
Use 505-MKP4O131004JKSSD if B+ > 630V.
C10
.22uF
505-MKP4J032204JKSSD
Use 505-MKP4O131004JKSSD if B+ > 630V.
C13
.22uF
505-MKP4J032204JKSSD
Use 505-MKP4O131004JKSSD if B+ > 630V.
C16
.22uF
505-MKP4J032204JKSSD
Use 505-MKP4O131004JKSSD if B+ > 630V.
C18
.22uF
505-MKP20.22/100/5
Bias supply
C20
.22uF
505-MKP20.22/100/5
Bias supply
C17
47uF
647-UKW2A470MPD
Bias supply
C19
47uF
647-UKW2A470MPD
Bias supply
C5
100uF
871-B43255A5107M000
Up to 30mm diameter.
C6
100uF
871-B43255A5107M000
Up to 30mm diameter.
C8
100uF
871-B43255A5107M000
Up to 30mm diameter.
C9
100uF
871-B43255A5107M000
Up to 30mm diameter.
C11
68uF
871-B43254A5686M000
Up to 30mm diameter.
C12
68uF
871-B43254A5686M000
Up to 30mm diameter.
C14
68uF
871-B43254A5686M000
Up to 30mm diameter.
C15
68uF
871-B43254A5686M000
Up to 30mm diameter.
D1
HER108
821-HER108
Not used with Full Wave CT or Rectifier Tube
D2
HER108
821-HER108
Not used with Full Wave CT or Rectifier Tube
D3
HER108
821-HER108
Not used with Rectifier Tube
D4
HER108
821-HER108
Not used with Rectifier Tube
D5
HER108
821-HER108
Bias supply
TR1
0-10K
594-64W103
Bias supply. Omit if using external pot.
R13
1k
283-1.0K-RC
Bias supply
R14
18k
283-18K-RC
Bias supply
R2
220k
281-220K-RC
R3
220k
281-220K-RC
R5
220k
281-220K-RC
R6
220k
281-220K-RC
R8
220k
281-220K-RC
R9
220k
281-220K-RC
R11
220k
281-220K-RC
R12
220k
281-220K-RC
R1
Jumper, Choke Input, or Voltage Drop Resistor (5W)
R4
Choke, or Voltage Drop Resistor (5W)
R7
6.8K
283-6.8K-RC
Size accordingly for H2 voltage (3W)
R10
56K
283-56K-RC
Size accordingly for H3 voltage (3W)