Millett Hybrid MAX - Design/Layout by Colin Toole Last revised:
5/20/07
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 1.00KXBK-ND[1]  $     0.49  $     0.49
RA7L/R 1M ohm 2 Mouser 71-RN55D-F-1.0M $0.18  $     0.36        
CA2L/R* 1000uF 16V Electrolytic* (16mm dia max)[2] 2 Mouser 647-UPW1C102MPD $0.77  $     1.54 DigiKey P12366-ND  $     0.59  $     1.18
CA4L/R, CA5L/R 470uF 35V Electrolytic (18mm dia. Max) 4 Mouser 647-UPW1V471MPD $0.88  $     3.52 DigiKey P12400-ND  $     0.76  $     3.04
CA3L/R, CA6L/R, CA8L/R** 0.22uF Film Cap (15mm leads max) 6 Mouser 505-M10.22/250/10 $1.11  $     6.66 DigiKey P3224-ND  $     1.28  $     7.68
CA7L/R* 470uF 35V Electrolytic* (16mm dia. Max)[3] 2 Mouser 647-UPW1V471MPD $0.88  $     1.76 DigiKey P12400-ND  $     0.76  $     1.52
CA9LR** 0.22uF Film Cap (20mm leads max)[4] 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[5] 4 Mouser 512-2N5087_J18Z $0.11  $     0.44 DigiKey 2N5087-ND  $     0.19  $     0.76
RA8L/R 1.13K ohm 2 Mouser 71-RN55D1131F $0.16  $     0.32 DigiKey 1.15KXBK-ND[6]  $     0.49  $     0.98
RA9L/R 11.3K ohm 2 Mouser 71-RN55D-F-11.3K $0.16  $     0.32 DigiKey 11.5KXBK-ND[7]  $     0.49  $     0.98
                     
MISC:                    
R1 (optional) 10 ohm, 1W resistor[8] 1 Mouser 282-10-RC $0.19  $     0.19 DigiKey 10W-2-ND  $     0.18  $     0.18
RA5C/L/R (RLED's) 1.2K ohm 1W[9] 3 Mouser 594-5073NW1K200J $0.16  $     0.48 DigiKey P1.2KW-1BK-ND  $     0.23  $     0.69
                     
LED1 Panel LED, low, 60 mcd - Blue 1 Mouser 859-LTL42UB6N $0.98  $     0.98 DigiKey 160-1604-ND  $     1.40  $     1.40
LEDL/R Tube LED's, 3mm ultra-high, 5500 mcd - Blue 2 LSDiodes www.lsdiodes.com $0.45  $     0.90 LSDiodes www.lsdiodes.com  $     0.45  $     0.90
                     
POT 50K AUDIO TAPER POT 1 Tangent/Amb ALPS RK27 $16.00  $   16.00 Tangent/Amb ALPS RK27  $   16.00  $   16.00
                     
VTL/R TUBES 2 Various 12AE6/A (gain of 14) $4.95  $     9.90 Various 12AE6, 12AE6A  $     4.95  $     9.90
        12FK6 (gain of 7)       12FK6    
        12FM6 (gain of 10)       12FM6    
SOCKET 7-PIN MINI TUBE SOCKET 2 Various 7-Pin Mini $1.95  $     3.90 Various 7-Pin Mini  $     1.95  $     3.90
Terminal Block 2pos 5.08mm pitch 1 Mouser 158-P02ELK508V2-E $0.72  $     0.72 DigiKey ED1930-ND  $     0.62  $     0.62
Terminal Block 3pos 5.08mm 1 Mouser 158-P02ELK508V3-E $1.08  $     1.08 DigiKey ED1931-ND  $     0.93  $     0.93
1/4" Stereo Jack Neutrik NMJ6HCD2 1 Mouser 550-22302 $1.10  $     1.10 DigiKey ----    $         -  
                     
PCB Circuit Board 1 DIYForums.org n/a $10.00  $   10.00 DIYForums.org n/a  $   10.00  $   10.00
                     
                     
POWER SUPPLY                    
RR1 120 ohm 1/4W 1 Mouser 71-RN55D-F-121 $0.16  $     0.16 DigiKey 121XBK-ND  $     0.49  $     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[10] 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 BC2054-ND  $     0.63  $     0.63
CR3A, CR3B, CR3C, CR3D 100pF NPO Ceramic 4 Mouser 140-50N5-101J-RC $0.08  $     0.32 DigiKey 399-4141-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 [11]  $     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 3.32KXBK-ND  $     0.49  $     0.49
RM2 1M ohm[12] 1 Mouser 71-RN55D-F-1.0M $0.18  $     0.18 DigiKey 1.00MXBK-ND  $     0.49  $     0.49
CM1 47uF, 25V Electrolytic  1 Mouser 647-UHE1E470MDD $0.15  $     0.15 DigiKey P13458-ND  $     0.11  $     0.11
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)[13] 1 Mouser 647-UVZ1C331MPH $0.35  $     0.35 DigiKey P12372-ND  $     0.32  $     0.32
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[14] 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
                     
                     
DB's Use this section ONLY if you build the Transistor, Diamond Buffer                    
RB1L/R 1K ohm 2 Mouser 71-RN55D-F-1.0K $0.16  $     0.32 DigiKey 1.00KXBK-ND  $     0.49  $     0.49
RB6L/R, RB7L/R 220 ohm 4 Mouser 71-RN55D-F-221 $0.16  $     0.64 DigiKey 221XBK-ND  $     0.49  $     0.98
RB2L/R, RB3L/R 10 ohm 4 Mouser 71-RN55D-F-10.2 $0.16  $     0.64 DigiKey 10.0XBK-ND  $     0.49  $     0.49
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 100XBK-ND  $     0.49  $     2.94
RB8L/R, RB9L/R NOT USED - for MOSFET ONLY - jumper out              
RB14L/R 22 ohm[15] 2 Mouser 71-RN65D-F-22.1 $0.51  $     1.02 DigiKey P22W-1BK-ND  $     0.23  $     0.46
QB1L/R PN4392[16] 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[17] 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[18] 6 Mouser 512-2N5088TA $0.06  $     0.36 DigiKey 2N5088BU-ND  $     0.18  $     1.08
QB8L/R MJE243 NPN power transistor[19] 2 Mouser 863-MJE243G $0.76  $     1.52 DigiKey MJE243GOS-ND  $     0.73  $     1.46
(better choices available) BD139 NPN power transistor[20] 2 Mouser 512-BD13916STU $0.33   DigiKey  $     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
(better choices available) BD140 PNP power transistor[21] 2 Mouser 512-BD14016STU $0.58  $     1.16 DigiKey  $     0.72  $     1.44
Special Alternates for Q8/Q9                    
a 2SC3421 NPN power transistor[22] 2 B&D Ent. 2SC3421 $0.70          
a 2SA1358 PNP power transistor 2 B&D Ent. 2SA1358 $0.65          
b 2SC3422 NPN power transistor[23] 2 B&D Ent. 2SC3422 $0.82          
b 2SA1359 PNP power transistor 2 B&D Ent. 2SA1359 $0.95          
c 2SC2344 NPN power transistor[24] 2 B&D Ent. 2SC2344 $0.56          
c 2SA1011 PNP power transistor 2 B&D Ent. 2SA1011 $0.56          
                     
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  
                   
                     
MOSFET's - Use this section ONLY if you use the MOSFET option                    
RB1L/R NOT USED - DB Version ONLY - jumper out              
RB6L/R, RB7L/R 220 ohm 4 Mouser 71-RN55D-F-221 $0.16  $     0.64 DigiKey 221XBK-ND  $     0.49  $     0.98
RB2L/R, RB3L/R 390 ohm 4 Mouser 71-RN55D-F-392 $0.16  $     0.64 DigiKey 10.0XBK-ND  $     0.49  $     0.49
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 1K ohm Trimmer Pot - different value 2 Mouser 72-T93YA-1K $1.20  $     2.40 DigiKey 490-2880-ND  $     0.85  $     1.70
RB4L/R, RB5L/R, RB8L/R, RB9L/R, RB13L/R 100 ohm 10 Mouser 71-RN55D-F-100 $0.16  $     1.60 DigiKey 100XBK-ND  $     0.49  $     4.90
RB14L/R 22 ohm[25] 2 Mouser 71-RN65D-F-22.1 $0.51  $     1.02 DigiKey P22W-1BK-ND  $     0.23  $     0.46
QB1L/R 2N5486[26] 2 Mouser 512-2N5486 $0.11  $     0.22 DigiKey 2N5486GOS-ND  $     0.46  $     0.92
QB2L/R, QB4L/R, QB6L/R 2N5087 PNP small signal[27] 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[28] 6 Mouser 512-2N5088TA $0.06  $     0.36 DigiKey 2N5088BU-ND  $     0.18  $     1.08
QB8L/R alt. MOSFET IRFZ24N[29] 2 Amb IRFZ24N/IRF9Z34N $3.00  $     6.00 DigiKey IRFZ24NPBF-ND  $     1.06  $     2.12
QB9L/R alt. MOSFET IRF9Z34N[30] 2 Amb IRFZ24N/IRF9Z34N  [31]  $         -   DigiKey IRF9Z34NPBF-ND  $     1.89  $     3.78
                     
Heat Sink Aavid #531002B02500G (1-1/2"h.) 4 Mouser 532-531102B25G $1.14 4.56 DigiKey HS352-ND  $     1.37  $     5.48
                   
                     
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   157.84   TOTAL    $ 166.02
                     
* These are consensus boutique electrolytic cap positions:
Use Elna RFS Silmic from DigiKey,
Nichicon Muse ES or KZ from Handmade Elec or Michael Percy, or
Black Gate N or NX from PartsConX or Soniccraft
** These are consensus boutique film cap positions, the selection choices are many.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

[1]
DigiKey:
Qty of 5

[2]
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
[3]
Thomas M. Blanchard:
Output coupling cap - directly in signal path, boutique cap may benefit
[4]
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
[5]
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.
[6]
DigiKey:
Qty of 5

[7]
DigiKey:
Qty of 5

[8]
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.
[9]
Thomas M. Blanchard:
Up to 1.5K is OK, power can be up to 0.9W at 30V and 1K resistor.
[10]
Thomas M. Blanchard:
2 are fine, 4 is optional.
[11]
Thomas M. Blanchard:
min qty 10
[12]
Thomas M. Blanchard:
R*C for RM2 and CM3 must equal ~300
[13]
Thomas M. Blanchard:
R*C for RM2 and CM3 must equal ~300
[14]
Thomas M. Blanchard:
Don't waste one of your expensive output transistors here - even if it's the same type.
[15]
Thomas M. Blanchard:
This is the output resistor.  Jumper this position unless you have noise problems or desire greater gain reduction.
[16]
Thomas M. Blanchard:
J310 is also acceptable, or other JFET's with IDSS >50
[17]
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.
[18]
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.
[19]
Steinchen:
well balanced, neutral to slightly warm sound. very stable due to moderate bandwidth.

default recommendation.
[20]
Steinchen:
slim sound, a little on the bright side. cheap and easy to source (at least in Europe).

[21]
Steinchen:
slim sound, a little on the bright side. cheap and easy to source (at least in Europe).

[22]
Steinchen:
strong bass, hard punch, recessed mids. highs tend to sound a little rough and pronounced.
[23]
Steinchen:
strong bass, neutral to warm sound.
good choice if you prefer rocky sound with slam
[24]
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!
[25]
Thomas M. Blanchard:
This is the output resistor.  Jumper this position unless you have noise problems or desire greater gain reduction.
[26]
Thomas M. Blanchard:
J310 is also acceptable, or other JFET's with IDSS >50
[27]
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.
[28]
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.
[29]
No MOSFETS at Mouser. Purchase them from Amb along with the ALPS pot.
[30]
No MOSFETS at Mouser. Purchase them from Amb along with the ALPS pot.
[31]
Amb's price is for complementary pair