Millett Hybrid MAX - Design/Layout by Colin Toole Last revised:
4/16/08		 BOM by
Tom Blanchard		    
PART ID  DESCRIPTION QTY SOURCE PART NO EACH TOTAL SOURCE PART NO  EACH   TOTAL 
                     
BASIC MILLETT                    
RA1L/R 5K Ohm Trim Pot 2 Mouser 72-T93YA-5K $1.21  $     2.42 DigiKey 490-2888-ND  $     0.85  $     1.70
RA2L/R, RA4L/R 1K ohm 4 Mouser 71-RN55D-F-1.0K $0.16  $     0.64 DigiKey CMF1.00KHFCT-ND  $     0.17  $     0.49
RA7L/R 1M ohm 2 Mouser 71-RN55D-F-1.0M $0.18  $     0.36 DigiKey CMF1.00MHFCT-ND  $     0.17  $     0.49
CA2L/R* 1000uF 16V Electrolytic* (16mm dia max)[1] 2 Mouser 647-UPW1C102MPD $0.77  $     1.54 DigiKey P12366-ND  $     0.59  $     1.18
CA4L/R, CA5L/R[2] 1000-1800uF 35V Electrolytic (18mm dia. max, 15mm leads max)[3] 4 Mouser 647-UPW1V182MHD $1.59  $     6.36 DigiKey P12410-ND  $     1.30  $     5.20
CA3L/R, CA6L/R, CA8L/R** 0.22uF Film Cap 15mm leads 6 Mouser 505-M10.22/250/10 $1.11  $     6.66 DigiKey BC1609-ND  $     0.63  $     3.78
CA7L/R* 470uF 35V Electrolytic* (16mm dia. Max)[4] 2 Mouser 647-UPW1V471MPD $0.88  $     1.76 DigiKey P12400-ND  $     0.76  $     1.52
CA9LR** 0.22uF Film Cap (20mm leads max)[5] 2 Mouser 505-M10.22/250/10 $1.11  $     5.04 DigiKey P3224-ND  $     1.28  $     2.56
                     
CCS:                    
QA1L/R, QA2L/R 2N5087 PNP small signal[6] 4 Mouser 512-2N5087_J18Z $0.11  $     0.44 DigiKey 2N5087-ND  $     0.19  $     0.76
RA8L/R 1.13K ohm   Mouser 71-RN55D1131F $0.16  $         -        
RA9L/R 11.3K ohm   Mouser 71-RN55D-F-11.3K $0.16  $         -        
Optional selection: results in CCS current of 0.65 ma                  
RA8L/R 1K ohm 2 Mouser 71-RN55D-F-1.0K $0.16  $     0.32 DigiKey CMF1.00KHFCT-ND  $     0.17  $     0.34
RA9L/R 10K ohm 2 Mouser 71-RN55D-F-10K $0.16  $     0.32 DigiKey CMF10.0KHFCT-ND  $     0.17  $     0.34
                     
MISC:                    
R1 (optional) 10 ohm, 1W resistor[7] 1 Mouser 282-10-RC $0.19  $     0.19 DigiKey 10W-2-ND  $     0.18  $     0.18
RA5C/L/R (RLED's) 2K ohm 1/2W[8] 3 Mouser 293-2K-RC $0.09  $     0.27 DigiKey 2.0KH-ND[9]  $     0.26  $     0.78
                     
LED1 Panel LED, 5mm, 60 mcd - Blue 1 Mouser 78-TLHB5400 $0.64  $     0.64 DigiKey 160-1604-ND  $     1.40  $     1.40
LEDL/R Tube LED's, 3mm ultra-high, 5500 mcd - Blue 2 Various   $1.00  $     2.00 Various    $     1.00  $     2.00
                     
POT 50K AUDIO TAPER POT 1 Beezar.com ALPS RK27 $16.00  $   16.00 Beezar.com ALPS RK27  $   16.00  $   16.00
                     
VTL/R TUBES 2 Beezar.com 12AE6/A (gain of 14) $5.00  $   10.00 Beezar.com 12AE6, 12AE6A  $     5.00  $   10.00
      Beezar.com 12FK6 (gain of 7) $5.00   Beezar.com 12FK6    
      Various 12FM6 (gain of 10)     Various 12FM6    
SOCKET 7-PIN MINI TUBE SOCKET 2 Beezar.com 7-Pin Mini $2.00  $     4.00 Beezar.com 7-Pin Mini  $     2.00  $     4.00
Terminal Block 2pos Not needed on production version 0 Mouser 158-P02ELK508V2-E $0.72  $         -   DigiKey ED1930-ND  $     0.62  $         -  
Terminal Block 3pos 5mm (or 5.08mm) 2[10] Mouser 571-2828363 $0.42  $     0.84 DigiKey ED1931-ND  $     0.93  $     1.86
1/4" Stereo Jack Neutrik NMJ6HCD2 1 Mouser 550-22302 $1.10  $     1.10 DigiKey ----    $         -  
Optional selection: recommended for high current DB's                
Fuse Clips, PCB mount 5x20 fuse clip, 0.2" horiz. lead spacing 2 Mouser 534-3519 $0.13  $     0.26 DigiKey 486-1173-ND  $     0.15  $     0.30
Fuse 5x20mm - 1A slo-blo optional, your choice[11] 1 Mouser       DigiKey      
                     
PCB Circuit Board 1 Beezar.com n/a $20.00  $   20.00 Beezar.com n/a  $   20.00  $   20.00
                     
                     
POWER SUPPLY                    
RR1 120 ohm 1/4W 1 Mouser 71-RN55D-F-121 $0.16  $     0.16 DigiKey CMF121HFCT-ND  $     0.17  $     0.49
RR2 2K ohm 1/2W 1 Mouser 71-RN60D-F-2K/R $0.21  $     0.21 DigiKey P2.0KW-1BK-ND  $     0.23  $     0.23
RR3 1K ohm trimmer pot 1 Mouser 72-T93YA-1K $1.20  $     1.20 DigiKey 490-2874-ND  $     0.85  $     0.85
CR1A, CR1B, CR1C, CR1D 1000uF 50V Electrolytic (18mm dia max) 4[12] Mouser 647-UPW1H102MHD $1.48  $     5.92 DigiKey P12393-ND  $     1.30  $     5.20
CR2 1uF 63V Box cap 1 Mouser 75-MKT1817510064 $0.77  $     0.77 DigiKey 478-3367-ND  $     0.45  $     0.45
CR3A, CR3B, CR3C, CR3D 100pF NPO Ceramic 4 Mouser 140-50N5-101J-RC $0.08  $     0.32 DigiKey 399-4199-ND  $     0.28  $     1.12
CR4 10uF 35V Tantalum 1 Mouser 581-TAP106K035SCS $1.28  $     1.28 DigiKey 399-3579-ND  $     1.50  $     1.50
CR5 1uF 50V Tantalum 1 Mouser 581-TAP105K050SCS $0.50  $     0.50 DigiKey 399-3547-ND  $     0.59  $     0.59
DR1A, DR1B, DR1C, DR1D Schottky 35V 10A Rectifier 4 Mouser 821-MBR1035 $0.64  $     2.56 DigiKey MBR1035GOS-ND  $     1.07  $     4.28
DR2, DR3 1N4002 2 Mouser 512-1N4002 $0.06  $     0.12 DigiKey 1N4002/54GICT-ND  $     0.69 [13]  $     1.38
VREG LM317T 1 Mouser 511-LM317T $0.39  $     0.39 DigiKey LM317TFS-ND  $     0.48  $     0.48
Heat Sink Wakefield #647-10ABP (1"h.) 1 Mouser 567-647-10ABP $1.23  $     1.23 DigiKey 345-1031-ND  $     1.79  $     1.79
recommended for MOSFET Wakefield #647-15ABP (1.5"h) 1 Mouser 567-647-15ABP $1.38   DigiKey 345-1032-ND  $     2.03  
                     
Walwart 24VAC, 750-1000ma Walwart
24VAC, 1000ma Walwart for MOSFET		 1 Mouser 553-WAU24-750 $7.70  $     7.70 DigiKey ----    $         -  
Power Socket 2.1mm Insulated Socket
(must be isolated from case)		 1 Mouser 163-4302-EX $1.38  $     1.38 Radio Shack 274-1563  $     1.99  $     1.99
SPST Switch Black Rocker w/round hole & thread 1 Mouser 103-R13-135A-02-EV $1.18  $     1.18 Radio Shack 275-693  $     2.99  $     2.99
                     
                     
E12 DELAY                    
RM1 3.32K ohm 1 Mouser 71-RN55D-F-3.32K $0.16  $     0.16 DigiKey CMF3.32KHFCT-ND  $     0.17  $     0.49
RM2 1M ohm[14] 1 Mouser 71-RN55D-F-1.0M $0.18  $     0.18 DigiKey CMF1.00MHFCT-ND  $     0.17  $     0.49
CM1 47uF, 25V Electrolytic  1 Mouser 140-HTRL25V47-RC $0.08  $     0.08 DigiKey 493-1300-ND  $     0.14  $     0.14
CM2 0.1uF X7R 1 Mouser 21RX310-RC $0.19  $     0.19 DigiKey 399-4329-ND  $     0.21  $     0.21
CM3 330uF 16V Electrolytic (10mm dia. Max)[15] 1 Mouser 140-HTRL25V330-RC $0.18  $     0.18 DigiKey 493-1285-ND  $     0.36  $     0.36
DM1 1N5242B Zener 1 Mouser 78-1N5242B $0.04  $     0.04 DigiKey 1N5242B-TPCT-ND  $     0.75  $     0.75
DM2 1N4148 1 Mouser 78-1N4148 $0.03  $     0.03 DigiKey 1N4148FS-ND  $     0.07  $     0.07
QM1 BD139[16] 1 Mouser 512-BD1396STU $0.33  $     0.33 DigiKey BD13916STU-ND  $     0.42  $     0.42
QM2 MPSA14 1 Mouser 512-MPSA14 $0.12  $     0.12 DigiKey MPSA14-ND  $     0.29  $     0.29
G6A Omron 12V DPDT Relay G6A-234P 1 Mouser 653-G6A-234P-DC12 $3.48  $     3.48 DigiKey Z106-ND  $     4.68  $     4.68
                     
                     
BJT Diamond Buffer (MOSFET version now on different website)                    
RB1L/R 1K ohm 2 Mouser 71-RN55D-F-1.0K $0.16  $     0.32 DigiKey CMF1.00KHFCT-ND  $     0.17  $     0.34
RB6L/R, RB7L/R 220 ohm 4 Mouser 71-RN55D-F-221 $0.16  $     0.64 DigiKey CMF221HFCT-ND  $     0.17  $     0.68
RB2L/R, RB3L/R 10 ohm 4 Mouser 71-RN55D-F-10.2 $0.16  $     0.64 DigiKey CMF10.2HFCT-ND  $     0.17  $     0.68
RB10L/R, RB11L/R 2.2 ohm 2W Metal Film 4 Mouser 594-5083NW2R200J $0.32  $     1.28 DigiKey P2.2W-2BK-ND  $     0.28  $     0.98
RB12L/R 2K ohm Trimmer Pot - different value 2 Mouser 72-T93YA-2K $1.20  $     2.40 DigiKey 490-2880-ND  $     0.85  $     1.70
RB4L/R, RB5L/R, RB13L/R 100 ohm 6 Mouser 71-RN55D-F-100 $0.16  $     0.96 DigiKey CMF100HFCT-ND  $     0.17  $     1.02
RB8L/R, RB9L/R NOT USED - for MOSFET ONLY - jumper out              
RB14L/R 22 ohm[17] 2 Mouser 71-RN65D-F-22.1 $0.51  $     1.02 DigiKey CMF22.1HFCT-ND  $     0.17  $     0.34
QB1L/R PN4392[18] 2 Mouser 512-PN4392 $0.15  $     0.30 DigiKey PN4392FS-ND  $     0.30  $     0.60
QB2L/R, QB4L/R, QB6L/R 2N5087 PNP small signal[19] 6 Mouser 512-2N5087_J18Z $0.11  $     0.66 DigiKey 2N5087-ND  $     0.19  $     1.14
QB3L/R, QB5L/R, QB7L/R 2N5088 NPN small signal[20] 6 Mouser 512-2N5088TA $0.06  $     0.36 DigiKey 2N5088BU-ND  $     0.18  $     1.08
QB8L/R MJE243 NPN power transistor[21] 2 Mouser 863-MJE243G $0.76  $     1.52 DigiKey MJE243GOS-ND  $     0.73  $     1.46
(default option) BD137 NPN power transistor[22] 2 Mouser 512-BD13716STU $0.31  $     0.62 DigiKey non-stock  $     0.73  $     1.46
QB9L/R MJE253 PNP power transistor 2 Mouser 863-MJE253G $0.58  $     1.16 DigiKey MJE253GOS-ND  $     0.72  $     1.44
(default option) BD138 PNP power transistor[23] 2 Mouser 512-BD13810STU $0.33  $     0.66 DigiKey non-stock  $     0.72  $     1.44
Special Alternates for Q8/Q9                    
a 2SC3421 NPN power transistor[24] 2 Beezar.com 2SC3421 $1.50  ***         
a 2SA1358 PNP power transistor 2 Beezar.com 2SA1358 $1.50  ***         
b 2SC3422 NPN power transistor[25] 2 Beezar.com 2SC3422 $1.75  ***         
b 2SA1359 PNP power transistor 2 Beezar.com 2SA1359 $1.75  ***         
c 2SC2344 NPN power transistor[26] 2 Beezar.com 2SC2344 $1.25  ***         
c 2SA1011 PNP power transistor 2 Beezar.com 2SA1011 $1.25  ***         
d 2SC2238 NPN power transistor[27] 2 Beezar.com 2SC2238 $2.00  ***         
d 2SA968 PNP power transistor 2 Beezar.com 2SA968 $2.00  ***         
                     
Heat Sink Aavid #531002B02500G (1"h.) 4 Mouser 532-531002B25G $1.06  $     4.24 DigiKey HS190-ND  $     1.25  $     5.00
  Aavid #531002B02500G (1-1/2"h.) 4 Mouser 532-531102B25G $1.14   DigiKey HS352-ND  $     1.37  
                   
                     
ENCLOSURE                    
PCB: 134.1W x 152.4L (mm) Hammond 1455T1601 1 Mouser 546-1455T1601 $23.58  $   23.58 DigiKey HM903-ND  $   23.57  $   23.57
        TOTAL   151.23   TOTAL    $ 149.05
                     
* These are consensus boutique electrolytic cap positions:
Use Nichicon Muse ES from Beezar.com, Bdent (CA7) &  Handmade Elec (CA2), or both from Michael Percy,
Elna RFS Silmic from DigiKey, or Black Gate N or NX from PartsConX or Soniccraft
** These are consensus boutique film cap positions, the selection choices are many.
However, be very careful what you put in CA9 - see the website on "boutique."
*** These may be cheaper if purchased at Bdent and/or MCMinone (there are minimum purchase thresholds).  
However, the 2SC2238/2SA968 pair are rare and often counterfeited.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
[1]
Thomas M. Blanchard:
Cathode Bypass Cap - in the signal path, so boutique cap may benefit.  Also - CA9L/R is the film bypass cap for this position
[2]
Suggest 1000uF for "symmetry"
[3]
Thomas M. Blanchard:
You can go up to 1800uf 35V with these and still stay under 1" height with FM's and 1500uf with UPW's.  The largest available is listed for Mouser and DigiKey that does not exceed 1800uf.  There is a 2200uf UPW at Mouser, but this much capacitance has not been tested.  1000uf should be viewed as a minimum.

[4]
Thomas M. Blanchard:
Output coupling cap - directly in signal path, boutique cap may benefit
[5]
Thomas M. Blanchard:
Cathode Bypass Film Cap - in the signal path, so boutique cap may benefit.  Also - CA2L/R is the electrolytic bypass cap for this position
[6]
Note: you should probably purchase about 50 - 100 each of the 2n5087/88 transistors.  Matching for the CCS may be particularly critical.

Also, prices change constantly.  Look for the lowest price specific part numbers at the time of your order.
[7]
Thomas M. Blanchard:
Heater Resistor, used to knock down the voltage to the heaters if high supply voltages (30VDC) are used.  10 ohm = -1.5V, 20 ohm = 3.0V.  Optional.
[8]
Thomas M. Blanchard:
2K puts the power in the 1/2W range and doesn't seem to hurt the brightness.  I burned some LED's on the prototype sizing this too close..
[9]
DigiKey:
Qty of 5
[10]
Note: the production MAX board has positions for two more terminal blocks - one input and one output.  Count 4 3pos terminal block if you want to use all of these positions.
[11]
There are too many variables to predict what size may be needed.  The fuse is useful for protecting your Class 2 plug-in transformer (AC walwart).  1A SLO-BLO should be your starting point.  If you want to reduce it from there, or experiment with a fast blo, that's up to you.  At some point, however, protecting the fuse may become the goal instead of the other way around.  Team Millett MAX recommends the use of a slo-blo or bypass it altogether.  The choice is optional.
[12]
Thomas M. Blanchard:
2 are fine, 4 is optional.
[13]
Thomas M. Blanchard:
min qty 10
[14]
Thomas M. Blanchard:
R*C for RM2 and CM3 must equal ~300
[15]
Thomas M. Blanchard:
R*C for RM2 and CM3 must equal ~300
[16]
Thomas M. Blanchard:
Don't waste one of your expensive output transistors here - even if it's the same type.
[17]
Thomas M. Blanchard:
This is the output resistor.  Jumper this position unless you have noise problems or desire greater gain reduction.
[18]
Thomas M. Blanchard:
J310 is also acceptable, or other JFET's with IDSS >50
[19]
Note: you should probably purchase about 50 - 100 each of the 2n5087/88 transistors.  Matching for the CCS may be particularly critical.

Also, prices change constantly.  Look for the lowest price specific part numbers at the time of your order.
[20]
Note: you should probably purchase about 50 - 100 each of the 2n5087/88 transistors.  Matching for the CCS may be particularly critical.

Also, prices change constantly.  Look for the lowest price specific part numbers at the time of your order.
[21]
Steinchen:
well balanced, neutral to slightly warm sound. very stable due to moderate bandwidth.
default recommendation.
[22]
Steinchen:
neutral to warm sound, strong bass, yet detailed. cheap and easy to source (at least in Europe).
default recommendation.
[23]
Steinchen:
neutral to warm sound, strong bass, yet detailed. cheap and easy to source (at least in Europe).
default recommendation.
[24]
Steinchen:
strong bass, hard punch, recessed mids. highs tend to sound a little rough and pronounced.
[25]
Steinchen:
strong bass, neutral to warm sound.
good choice if you prefer rocky sound with slam
[26]
Steinchen:
crystal clear and airy, rather bright but not piercing bright. good detail and instrument seperation. well defined bass. sounds clean and analytical.
note reversed pinout!
[27]
Steinchen:
neutral and balanced sound, tight bass. detailed and clear highs without being bright, easy to listen to
excellent choice
note reversed pinout!