MiniMAX BOM

[1]

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]

You can go up to 1800uf 35V with these and still stay under 1" height with FM's and the newest UPW's (2200). 1000uf should be viewed as a minimum.

[4]

Note that CA9 is the bypass film capacitor for the cathode tube bypass. This cap is normally considered to be in the signal path, but not directly. Unless you are certain of results, leave this cap as the recommended Wima. Detrimental effects may occur to the bass response if a quality boutique film cap is used in this position. Note that upgrading CA3 and CA6 beyond the recommended Wimas is not beneficial.

[5]

Output coupling cap - directly in signal path, boutique cap may benefit

[6]

Output bypass coupling cap. This cap is directly in the signal path prior to connection to the headphone. A Vitamin Q or similar "boutique" film cap will yield excellent results in this position.

[7]

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.

[8]

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, but it must be jumpered if not used.

[9]

These resistors are a bit higher-rated than necessary, but will fit within the pads.

[10]

2K puts the power in the 1/2W range and allows the use of cheap and common carbon film resistors, if desired. However, 1/2W carbon films are too big for the pads and will need to be installed in a "kneeling" posture.

[11]

DigiKey:
Qty of 5

[12]

Since LSDiodes has stopped selling LED's, Team Millett MAX has not found a vendor to recommend for every case. LED's are plentiful, however. Simply select the highest-rated MCD LED that uses 20ma current and is a T1, 3mm LED.

[13]

Note: the production MiniMAX board has positions for three terminal blocks - one input at the pot, one output at the headphone jack, and one for power input.

[14]

Pick some different colors - maybe red, white, and black or gray - the 3rd digit in the middle number changes for color: 801 is white, 802 is red, 803 is black.

[15]

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 or increase it from there, or experiment with a fast blo, that's up to you. Be careful, however, or protecting the fuse may become the goal instead of the other way around.

[16]

min qty 10

[17]

Note: this jack is the inverse of the Mouser version - the threads are outside instead of inside.

[18]

Recommendation:
R*C for RM2 and CM3 should equal ~450 or greater. Greater values will result in greater delays.

[19]

Recommendation:
R*C for RM2 and CM3 should equal ~450 or greater. Greater values will result in greater delays.

[20]

Thomas M. Blanchard:
Don't waste one of your expensive output transistors here - even if it's the same type. The BD139 is very cheap.

[21]

This is the output resistor. Jumper this position unless you have noise problems or desire greater gain reduction.

[22]

This is the output resistor. Jumper this position unless you have noise problems or desire greater gain reduction.

[23]

J310 is also acceptable, or other JFET's with IDSS >50

[24]

[25]

[26]

Steinchen:
well balanced, neutral to slightly warm sound. very stable due to moderate bandwidth.
default recommendation.

[27]

Steinchen:
neutral to warm sound, strong bass, yet detailed. cheap and easy to source (at least in Europe).
default recommendation.

[28]

Steinchen:
neutral to warm sound, strong bass, yet detailed. cheap and easy to source (at least in Europe).
default recommendation.

[29]

Steinchen:
strong bass, hard punch, recessed mids. highs tend to sound a little rough and pronounced.

[30]

Steinchen:
strong bass, neutral to warm sound.
good choice if you prefer rocky sound with slam

[31]

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!

[32]

Steinchen:
neutral and balanced sound, tight bass. detailed and clear highs without being bright, easy to listen to
excellent choice
note reversed pinout!

Millett Hybrid MiniMAX - Design/Layout by Colin Toole							Last revised: 1/16/2010	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	$1.44	$ 2.88	DigiKey	490-2888-ND	$ 0.86	$ 1.72
RA2L/R, RA4L/R	1K ohm	4	Mouser	71-RN55D-F-1.0K	$0.08	$ 0.32	DigiKey	CMF1.00KHFCT-ND	$ 0.17	$ 0.49
RA7L/R	1M ohm	2	Mouser	71-RN55D-F-1.0M	$0.08	$ 0.16	DigiKey	CMF1.00MHFCT-ND	$ 0.17	$ 0.49
CA2L/R*	1000uF 16V Nichicon MUSE ES[1]	2	Beezar.com	ES-1000-16	$1.75	$ 3.50	Beezar.com	ES-1000-16	$ 1.75	$ 6.13
CA4L/R, CA5L/R[2]	1000-1800uF 35V Electrolytic (18mm dia. max, 15mm leads max)[3]	4	Mouser	647-UPW1V182MHD	$1.08	$ 4.32	DigiKey	P12410-ND	$ 1.30	$ 5.20
CA3L/R, CA6L/R, CA9L/R	0.22uF Film Cap 15mm leads[4]	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)[5]	2	Beezar.com	ES-470-35	$2.00	$ 4.00	Beezar.com	ES-470-35	$ 2.00	$ 4.00
CA8LR**	0.18uf Sprague Vitamin Q PIO film cap[6]	2	Beezar.com	VitQ-18-100	$3.00	$ 6.00	Beezar.com	VitQ-18-100	$ 3.00	$ 6.00

CCS:
QA1L/R, QA2L/R	2N5087 PNP small signal[7]	4	Mouser	512-2N5087_J18Z	$0.08	$ 0.32	DigiKey	2N5087-ND	$ 0.19	$ 0.76
RA8L/R	1.13K ohm		Mouser	71-RN55D1131F	$0.16	$ -	DigiKey	CMF1.13KHFCT-ND	$ 0.17	$ -
RA9L/R	11.3K ohm		Mouser	71-RN55D-F-11.3K	$0.16	$ -	DigiKey	CMF11.3KHFCT-ND	$ 0.17	$ -
Optional selection:	results in CCS current of 0.65 ma
RA8L/R	1K ohm	2	Mouser	71-RN55D-F-1.0K	$0.08	$ 0.16	DigiKey	CMF1.00KHFCT-ND	$ 0.17	$ 0.34
RA9L/R	10K ohm	2	Mouser	71-RN55D-F-10K	$0.08	$ 0.16	DigiKey	CMF10.0KHFCT-ND	$ 0.17	$ 0.34

MISC:
R1	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)	2K ohm 1W[9]	3	Mouser	594-5073NW2K000J	$0.16	$ 0.48
	2K ohm 1/2W (alternate)[10]		Mouser	293-2K-RC	$0.09	$ -	DigiKey	2.0KH-ND[11]	$ 0.26	$ -

LED1	Center LED, 3mm, 4000 mcd - Color Change	1	Beezar.com	BzrLED-RGB	$0.75	$ 0.75	Beezar.com	BzrLED-RGB	$ 0.75	$ 0.75
LEDL/R	Tube LED's, 3mm SuperBrite, 4000 mcd[12]	2	Beezar.com	Varies	$0.25	$ 0.50	Beezar.com	Varies	$ 0.25	$ 0.50
							Beezar.com	Varies	$ 0.25
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		Beezar.com	12AE6/A (gain of 14)	$5.00	$ -	Beezar.com	12AE6, 12AE6A	$ 5.00	$ -
			Beezar.com	12FK6 (gain of 7)	$5.00		Beezar.com	12FK6	$ 5.00	$ -
		2	Beezar.com	12FM6 (gain of 10)	$7.00	$ 14.00	Beezar.com	12FM6	$ 6.50	$ 13.00
SOCKET	7-PIN MINI TUBE SOCKET	2	Beezar.com	GZC7-Y-G	$2.00	$ 4.00	Beezar.com	GZC7-Y-G	$ 2.00	$ 4.00
Terminal Block 3pos	5mm (or 5.08mm)	2[13]	Mouser	571-2828363	$0.66	$ 1.32	DigiKey	ED1931-ND	$ 0.93	$ 1.86
1/4" Stereo Jack	Neutrik NMJ6HCD2	1	Mouser	550-22302	$1.13	$ 1.13	DigiKey	----		$ -
Tip Jacks	Emerson [14]	3	Mouser	530-105-0602-1	$1.08	$ 3.24	DigiKey	TBD
RCA Jacks	Philmore MTG12	1	Beezar.com	MTG-12, BL + RD	$6.00	$ 6.00	Beezar.com	MTG-12, BL + RD
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[15]	1	Mouser	576-0218001.HXP	$0.61	$ 0.61	DigiKey

PCB	Circuit Board	1	Beezar.com	MiniMAX PCB	$15.00	$ 15.00	Beezar.com	MIniMAX PCB	$ 20.00	$ 20.00


POWER SUPPLY
RR1	120 ohm 1/4W	1	Mouser	71-RN55D-F-121	$0.08	$ 0.08	DigiKey	CMF121HFCT-ND	$ 0.17	$ 0.49
RR2	2K ohm 1/2W	1	Mouser	71-RN60D-F-2K/R	$0.09	$ 0.09	DigiKey	P2.0KW-1BK-ND	$ 0.23	$ 0.23
RR3	1K ohm trimmer pot	1	Mouser	72-T93YA-1K	$1.44	$ 1.44	DigiKey	490-2874-ND	$ 0.86	$ 0.86
PF1	Polyfuse, resettable radial 0.5A 72V	1	Mouser	650-RXEF050	$0.38	$ 0.38	DigiKey	RXEF050-ND	$ 0.44	$ 0.44
CR1A, CR1B	1000uF 50V Electrolytic (18mm dia max)	2	Mouser	647-UPW1H102MHD	$0.80	$ 1.60	DigiKey	P12393-ND	$ 1.30	$ 2.60
CR2	1uF 63V Box cap	1	Mouser	75-MKT1817510064	$0.82	$ 0.82	DigiKey	478-3367-ND	$ 0.45	$ 0.45
CR3A, CR3B, CR3C, CR3D	100pf C0G Axial Ceramic	4	Mouser	581-SA102A101JAR	$0.11	$ 0.44	DigiKey	478-3141-1-ND	$ 0.19	$ 0.76
	100pF NPO Ceramic Disc (alternate)		Mouser	140-50N5-101J-RC	$0.08	$ -	DigiKey	399-4199-ND	$ 0.28	$ -

CR4	82uf 35V Electrolytic (6.3mm dia max)	1	Mouser	647-UPW1V820MED	$0.26	$ 0.26	DigiKey	399-3579-ND	$ 1.50	$ 1.50

DR1A, DR1B, DR1C, DR1D	Schottky MBR360, 60V 3A Rectifier - AXIAL	4	Mouser	863-MBR360RLG	$0.34	$ 1.36	DigiKey	MBR360-ND	$ 0.64	$ 2.56
DR2, DR3	1N4002	2	Mouser	512-1N4002	$0.07	$ 0.14	DigiKey	1N4002/54GICT-ND	$ 0.69 [16]	$ 1.38
VREG	LM317T	1	Mouser	511-LM317T	$0.64	$ 0.64	DigiKey	LM317TFS-ND	$ 0.48	$ 0.48
Heat Sink	Wakefield #647-10ABP (1"h.)	1	Mouser	567-647-10ABP	$1.39	$ 1.39	DigiKey	345-1031-ND	$ 1.79	$ 1.79
Heat Sink Kit w Shldr Wshr	for LM317 Voltage Regulator	1	Beezar.com	HtSkKit-1	$1.50	$ 1.50	Beezar.com	HtSkKit-1	$ 1.25	$ 1.25


Walwart	24VAC, 750-1000ma Walwart	1	Mouser	553-WAU24-750	$11.00	$ 11.00	DigiKey	----		$ -
Power Socket	2.1mm Insulated Socket (must be isolated from case)	1	Mouser	163-4302-E	$1.38	$ 1.38	DigiKey	CP-011A-ND[17]	$ 1.49	$ 1.49
SPST Switch	Red Pushbutton w/round body & thread		Mouser	10PP422	$2.35	$ -	Radio Shack	275-1565	$ 2.99	$ -
	Red Pushbutton w/square body & thread	1	Mouser	10PP432	$2.39	$ 2.39
Knob	Silver, Solid Aluminum, 30mm dia	1	ebay/Partspipe		$5.00	$ 5.00


E12 DELAY
RM1	3.32K ohm	1	Mouser	71-RN55D-F-3.32K	$0.08	$ 0.08	DigiKey	CMF3.32KHFCT-ND	$ 0.17	$ 0.49
RM2	1M ohm[18]	1	Mouser	71-RN55D-F-1.0M	$0.08	$ 0.08	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

CM3	470uF 16V Electrolytic (10mm dia. Max)[19]	1	Mouser	140-HTRL16V470-RC	$0.17	$ 0.17	DigiKey	493-1286-ND	$ 0.29	$ 0.29
DM1	1N5242B Zener	1	Mouser	78-1N5242B	$0.03	$ 0.03	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[20]	1	Mouser	512-BD1396STU	$0.30	$ 0.30	DigiKey	BD13916STU-ND	$ 0.42	$ 0.42
QM2	MPSA14	1	Mouser	512-MPSA14	$0.20	$ 0.20	DigiKey	MPSA14-ND	$ 0.29	$ 0.29
G6A	Omron 12V DPDT Relay G6A-234P	1	Mouser	653-G6A-234P-DC12	$3.67	$ 3.67	DigiKey	Z106-ND	$ 4.68	$ 4.68


BJT Diamond Buffer
RB1L/R	1K ohm	2	Mouser	71-RN55D-F-1.0K	$0.08	$ 0.16	DigiKey	CMF1.00KHFCT-ND	$ 0.17	$ 0.34
RB6L/R, RB7L/R	220 ohm	4	Mouser	71-RN55D-F-221	$0.08	$ 0.32	DigiKey	CMF221HFCT-ND	$ 0.17	$ 0.68
RB2L/R, RB3L/R	10 ohm	4	Mouser	71-RN55D-F-10.2	$0.10	$ 0.40	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	$1.44	$ 2.88	DigiKey	490-2880-ND	$ 0.86	$ 1.72
RB4L/R, RB5L/R, RB13L/R	100 ohm	6	Mouser	71-RN55D-F-100	$0.08	$ 0.48	DigiKey	CMF100HFCT-ND	$ 0.17	$ 1.02
RB8L/R, RB9L/R	NOT USED - for MOSFET ONLY - jumper out
RB14L/R	jumper[21]	2	-		$0.00	$ -	-		$ -	$ -
	Kiwame 10R (alternate)[22]	2	Beezar.com	KOA/Kiwame 10R 2W	$0.35	$ 0.70	Beezar.com	KOA/Kiwame 10R 2W	$ 0.35	$ 0.70
QB1L/R	PN4392 Matched for current[23]	1	Beezar.com	PN4392pr	$2.50	$ 2.50	DigiKey	PN4392FS-ND	$ 0.60	$ 0.60
QB2L/R, QB4L/R, QB6L/R	2N5087 PNP small signal[24]	6	Mouser	512-2N5087_J18Z	$0.11	-	DigiKey	2N5087-ND	$ 0.19	$ 1.14
QB3L/R, QB5L/R, QB7L/R	2N5088 NPN small signal[25]	6	Mouser	512-2N5088TA	$0.07	-	DigiKey	2N5088BU-ND	$ 0.18	$ 1.08
	Matched Small Transistors (preferred alternate)	1	Beezar.com	Matched Transistors	$2.50	$ 2.50
QB8L/R	MJE243 NPN power transistor[26]		Mouser	863-MJE243G	$0.76	$ -	DigiKey	MJE243GOS-ND	$ 0.73	$ -
(default option)	BD137 NPN power transistor[27]		Mouser	512-BD13716STU	$0.31	$ -	DigiKey	non-stock	$ 0.73	$ -
QB9L/R	MJE253 PNP power transistor		Mouser	863-MJE253G	$0.58	$ -	DigiKey	MJE253GOS-ND	$ 0.72	$ -
(default option)	BD138 PNP power transistor[28]		Mouser	512-BD13810STU	$0.33	$ -	DigiKey	non-stock	$ 0.72	$ -
Special Alternates for Q8/Q9
a	2SC3421 NPN power transistor[29]	2	Beezar.com	2SC3421	$1.50	***
a	2SA1358 PNP power transistor	2	Beezar.com	2SA1358	$1.50	***
b	2SC3422 NPN power transistor[30]	2	Beezar.com	2SC3422	$1.75	$ 3.50
b	2SA1359 PNP power transistor	2	Beezar.com	2SA1359	$1.75	$ 3.50
c	2SC2344 NPN power transistor[31]	2	Beezar.com	2SC2344	$1.25	***
c	2SA1011 PNP power transistor	2	Beezar.com	2SA1011	$1.25	***
d	2SC2238 NPN power transistor[32]	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
Heat Sink Kit w/o Shldr Wshr	for Toshiba 2SC3422/2SA1359	4	Beezar.com	HtSkKit-2	$1.25	$ 5.00

ACCESSORIES
Digital Multimeter	Centech Digital Multimeter	1	Beezar.com	Centech DMM	$6.50	$ 6.50	Beezar.com	Centech DMM	$ 6.50	$ 42.25
Trimmer Adjustment Tool	Bourns Trimpot Adjustment Tool	1	Beezar.com	H-90	$2.00	$ 2.00	Beezar.com	H-90	$ 2.00	$ 4.00

ENCLOSURE***
PCB: approx. 5" x 6"	Lansing		Lansing-Clear	DT1A60-06A1	$21.37	$ -	Lansing-Black	DT1K60-06B2	$ 23.07	$ -
	Custom Machined Beezar/Lansing MiniMAX Case	1	Beezar.com	MiniMAX Case - Black	$65.00	$ 65.00	Beezar.com	MiniMAX Case - Black	$ 65.00	$ 65.00
Center Standoff Kit	For Custom Beezar/Lansing case	1	Beezar.com	Beezar Cskit	$1.00	$ 1.00			$ 1.00	$ 1.00
				TOTAL		$228.47		TOTAL	(Incomplete)

* These are consensus boutique electrolytic cap positions, the selection choices are many.
** These are consensus boutique film cap positions, the selection choices are many.
*** Fully machined case, punched endplates, cooling slots, and silkscreened labeling