Up for sale here is this brand new Sencore MU-150 bare circuit board.  It is redesigned and has a number of upgrades from the original design.  

1.  The dual-section power supply capacitor is relocated to the board.
2.  The power supply filter capacitor values are increased for better filtering.
3.  The 0B2 tube is replaced with solid state parts.
4.  Trimmers are added to make calibration easier.
5.  A current-sensing resistor has been added to the meter path.

This is a new replacement board.  It is similar to the original but has been improved and redesigned in a number of ways.  This is a super-high-quality circuit board; it is unbelievably nicer than the originals.  You will want to mount the 12AU7 socket sideways on the edge of the board and run wires down to the board.

This board is designed to use modern parts, and is marked (and sized) for them.  The board is marked with part specs so it's easy to install new parts.  I do have a parts list to populate a board--it is at the bottom of this listing.  Resistors are not on the list, sorry.  The board is marked with the resistor specs--if no wattage is specified, it's a 1/2W resistor.  You will need to build this out yourself--it is obviously not complete, and I do not have complete boards available.  This is fairly advanced-level work. 

Just FYI, R23 on the board is marked 270 ohms like the original.  The parts list suggests a 500-ohm trimmer for R23, since they don't really make 270-ohm trimmers and a 500-ohm will work fine there.

US shipping and handling is $7, and international is $24, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.


BOM Parts List (resistors are NOT on the list):
BridgeMDA106G1Bridge RectifierBridge Rectifier
C1/C2A1/2EEU-EE2E820S3Capacitor82 uf 250v
C10/11WMC2D1K-F2Capacitor.001 uf
C161Capacitor10 uf 50v (or higher) axial
C17ECQ-E2224KF1Capacitor.22 uf 250v Radial
C2BUCA2E470MHD61Capacitor50 uf 250v Radial
C3ECQ-E2474KF1Capacitor.47 uf 250v Radial
C4ECQ-E2333KF1Capacitor.033 uf 250v
C6/7/C13ECQ-E4103KF3Capacitor.01 uf 630v
C91Capacitor.003 uf
CR11BZX85B8V2-TR1Diode8.2v Zener
CR12B1N58171Diode1N5817
CR5/CR6/CR7/CR8/CR12A/CR136Diode1N4007
CR9/10BAT462Diode1N34A (can replace with BAT46)
Neon1BulbNE2 bulb
R11Resistor68k ohm 1/2W
R101Resistor68k ohm 1W
R16/R17/R18/R26/R27/R316Resistor150k ohm 1/2W
R191Resistor8.2M ohm 1/2W
R2/R62Resistor5.6M ohm 1/2W
R21/R23/R24/R35PV36W501C01B004Trimmer500 ohm
R251Resistor820 ohm 1/2W
R28/R372Resistor1.8k ohm 1/2W
R291Resistor3.3k 5W
R3/R72Resistor2k 3W
R30/R322Resistor33k ohm 1/2W
R33/382Resistor100k ohm 1/2W
R343296W-1-502LF1Trimmer5k trimmer
R35A1Resistor10 ohm 1/2W
R391Resistor10M ohm 1/2W
R41Resistor12k ohm 1W
R441Resistor1M ohm 1/2W
R461Resistor2.7M ohm 1/2W
R471Resistor3.3M ohm 1/2W
R51Resistor47k ohm 1/2W
R6A1Resistor4.7M ohm 1/2W
R81Resistor180k ohm 1/2W
R91Resistor5.1k ohm 1/2W
TR1/TR2/TR32N29233Transistor2N2923
Z1/2/31N5938BRLG3Diode36v 2W zener

Calibration info:
1) The static emission needs a plug to be built with 2 resistors and a diode, as per the manual. Insert it and adjust the meter mid range with 1 trimmer. That calibrates the tube voltage differential for all measurement.

2) The GM emission calibration is a 2 step process. You need a 1600 ohm resistor to the arm of the signal pot, to the 0.47uf cap of the voltage amplifier (marked CAL in to board), as per the user manual.

- Max signal first, you adjust the meter at 100% with 2 trimmers. Don't worry about using an oscilloscope, just use a multimeter and measure the voltage at the arm of the signal pot

- For min signal, remove the 1.6 resistor and adjust the voltage to 1/10 of what you measured before.

They want the max signal to be 100% of the meter, and the min a tenth of it, to have a linear range.