The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB

aive · 2019-06-30 8:31 am

Hi XRK - is it possible to build a balanced config with 4 x boards?

And I’m in Aus (QLD) - is there a way to get better shipping rate? Etsy is quoting almost fiddy bucks

aive · 2019-06-30 11:45 am

aive said:
And I’m in Aus (QLD) - is there a way to get better shipping rate? Etsy is quoting almost fiddy bucks

Hey XRK ignore query re shipping. I thought you were in Aus for some reason ><

xrk971 · 2019-06-30 1:33 pm

You mean like a bridge tied load (BTL) amp? Maybe, let’s ask Hugh.

That would be like a 200w amp I think.

aive · 2019-07-01 12:05 am

All good - I'll just go with single-ended for now. Order placed

xrk971 · 2019-07-01 12:28 am

Thanks for your order, Aive - you can always get a pair later to try your balanced drive idea.

AKSA · 2019-07-01 12:36 am

YES the BB ALPHA can be bridged like most amps.
Your outputs must be doubled for voltage and current but the specified mosfets are fine.
You would need balanced inputs for this OR you could insert a single to balanced stage to accord with a single input signal.
However this doubles all the parts count, and more - you will have a huge thermal problem around 235W per channel and lots of fans and cooling towers.
But all possible.....
HD

aive · 2019-07-01 12:43 am

AKSA said:
YES the BB ALPHA can be bridged like most amps.
Your outputs must be doubled for voltage and current but the specified mosfets are fine.
You would need balanced inputs for this OR you could insert a single to balanced stage to accord with a single input signal.
However this doubles all the parts count, and more - you will have a huge thermal problem around 235W per channel and lots of fans and cooling towers.
But all possible.....
HD

Thanks Aksa

My preamp has balanced outputs, so hence the query - but I'm going to start with SE arrangement first, keep it simple

a3cervo · 2019-07-01 11:53 am

Hi X,

Placed the order for 2 boards in your shop.

Thanks!

xrk971 said:
I had to do a full count of how many are available vs what was ordered. There should be 2 more in stock in the shop. These are the final 2 for GB1.

xrk971 · 2019-07-01 3:02 pm

Thanks, A3cervo.

To ABBB Builders:
Sorry for the confusion but there is no limit on the ABBB PCBs as we are still in pre-order mode. I got this mixed up with another project as I am handling multiple GBs at once. I just got word that the verification PCBs have been fabricated, however it will be a few days before the other boards in same order will be done. But should be shipping out to me in about 2 more days, and 3-4 days more before I receive it for the verification build. Vunce and I will be ordering the BOM in preparation for the verification build.

aive · 2019-07-01 10:51 pm

Thanks for the update X - I’m just starting to research and put BOM together now - starting by merging the Alpha BB and SLB BOMs from respective threads. Do you plan on releasing the BOM you’re using for the verification build - it would be most helpful?

xrk971 · 2019-07-02 12:02 am

Yes, I will post BOM soon.

xrk971 · 2019-07-02 2:04 am

Here is the ABBB BOM (v0) - for prototype verification build only, subject to change.

Code:

ABBB Amp BOM v0 verification build July 1, 2019
Part	Value	Package	Description
C101	220p	C5B4.5	CAPACITOR
C102	10µ0	E5-10,5	POLARIZED CAPACITOR, European symbol
C104	1000µ	E5-13	POLARIZED CAPACITOR, European symbol
C111	47p	C1206	10µ, 16V, X7R, 1206
C113	1000µ	E7,5-18	POLARIZED CAPACITOR, European symbol
C114	1µ0	C7.5B6	CAPACITOR
C115	0µ01	C5B7.2	CAPACITOR
C118	220µ	E7,5-18	POLARIZED CAPACITOR, European symbol
C119	220µ	E7,5-18	POLARIZED CAPACITOR, European symbol
C143	220p	C0805	2µ2, 16V, X7R, 0805
C144	220p	C0805	2µ2, 16V, X7R, 0805
C201	0µ01	C5B2.5	CAPACITOR
C202	0µ1	C5B2.5	CAPACITOR
C203	1µ0	C5B7.2	CAPACITOR
C204	15000µ	EB35D	POLARIZED CAPACITOR, European symbol
C205	1µ0	C5B7.2	CAPACITOR
C206	15000µ	EB35D	POLARIZED CAPACITOR, European symbol
C207	1µ0	C5B7.2	CAPACITOR
C211	1000µ	E5-13	POLARIZED CAPACITOR, European symbol
C214	47p	C1206	10µ, 16V, X7R, 1206
C215	47p	CD15FD101FO3F	
C216	1000µ	E5-13	POLARIZED CAPACITOR, European symbol
C217	0µ1	C5B2.5	CAPACITOR
C218	220µ	E3,5-8	POLARIZED CAPACITOR, European symbol
C221	0µ01	C5B2.5	CAPACITOR
C222	0µ1	C5B2.5	CAPACITOR
C223	1µ0	C5B7.2	CAPACITOR
C224	15000µ	EB35D	POLARIZED CAPACITOR, European symbol
C225	1µ0	C5B7.2	CAPACITOR
C226	15000µ	EB35D	POLARIZED CAPACITOR, European symbol
C227	1µ0	C5B7.2	CAPACITOR
C231	1000µ	E5-13	POLARIZED CAPACITOR, European symbol
C234	47p	C1206	10µ, 16V, X7R, 1206
C235	47p	CD15FD101FO3F	
C236	1000µ	E5-13	POLARIZED CAPACITOR, European symbol
C237	0µ1	C5B2.5	CAPACITOR
C238	220µ	E3,5-8	POLARIZED CAPACITOR, European symbol
C301	0µ22	C5B3	CAPACITOR
C302	NP	E5-13	POLARIZED CAPACITOR, European symbol
C303	0µ22	C5B3	CAPACITOR
C308	22µ0	E2-5	POLARIZED CAPACITOR, European symbol
C1001	0µ022	C10B4	CAPACITOR
C1020	10µ0	C37.5B19	CAPACITOR
C1021	10µ0	MCAP250V10U	Fidelity Component MCap
C1022	1µ0	C22.5B7	CAPACITOR
C1110	47p	CD15FD101FO3F	
C1180	1µ0	C7.5B6	CAPACITOR
C1190	1µ0	C7.5B6	CAPACITOR
H207		LED3MM	LED
H227		LED3MM	LED
H301	LTV-8141	DIL04	SHARP OPTO COUPLER
H311		LED3MM	LED
H314	TLP3906	TLP3906	
N201	LT4320N6	DIL08	
N221	LT4320N6	DIL08	
N301	LM2903N	DIL08	COMPARATOR
PAD1		3,17/1,3	THROUGH-HOLE PAD
PAD2		3,17/1,3	THROUGH-HOLE PAD
PAD3		3,17/1,3	THROUGH-HOLE PAD
PAD4		3,17/1,3	THROUGH-HOLE PAD
R100	220k	CMF-55	
R101	2k2	CMF-55	
R102	330R	CMF-55	
R103	18k0	CMF-55	
R104	3k3	CMF-55-13MM	
R105	TBD	CMF-55-13MM	
R106	TBD	CMF-55	
R107	220R	CMF-55-13MM	
R108	47R0	CMF-55	
R111	1k0	CMF-55	
R112	2k2	CMF-55	
R113	680R	CMF-55+9MM	
R114	10R0	CMF60-ON-LUG	
R115	220k	CMF-55	
R116	100k	CMF-55	
R117	1k0	CMF-55-13MM	
R118	1k0	CMF-55	
R119	925R	CMF-55-13MM	
R126	10R0	CMF-55	
R141	68R0	CMF-55	
R142	68R0	CMF-55-13MM	
R143	47R0	ERA6A	24R9, 100V, 125mW, 0.1%, 25ppm, 0805
R144	47R0	ERA6A	24R9, 100V, 125mW, 0.1%, 25ppm, 0805
R145	0R68	ERX-3SJ	
R146	0R68	ERX-3SJ-ON-LUG	
R147	0R62	ERX-3SJ	
R148	NP	ERX-3SJ-ON-LUG	
R151	0R33	ERX-3SJ	
R152	0R33	ERX-3SJ-ON-LUG	
R153	0R33	ERX-3SJ	
R154	18k0	CMF-55-13MM	
R155	NP	ERX-3SJ-ON-LUG	
R202	180R	CMF-55	
R203	0R1	MPC74	
R204	0R1	MPC74	
R207	10k0	CMF-55	
R211	332R	CMF-55	
R212	75R0	CMF-55	
R213	200R	RTRIMT93YA	Trimm resistor
R214	68R1	CMF-55	
R215	10k0	CMF-55	
R222	180R	CMF-55	
R223	0R1	MPC74	
R224	0R1	MPC74	
R227	10k0	CMF-55	
R231	332R	CMF-55	
R232	75R0	CMF-55	
R233	200R	RTRIMT93YA	Trimm resistor
R234	68R1	CMF-55	
R235	10k0	CMF-55	
R236	10R0	CMF-55	
R301	1k0	0207/10	RESISTOR, European symbol
R302	4k7	0204/7	RESISTOR, European symbol
R303	10k0	0204/7	RESISTOR, European symbol
R304	200k	0204/7	RESISTOR, European symbol
R305	100k	0204/7	RESISTOR, European symbol
R306	1M0	0204/7	RESISTOR, European symbol
R307	4k7	0204/7	RESISTOR, European symbol
R308	100k	0204/7	RESISTOR, European symbol
R311	100k	0204/7	RESISTOR, European symbol
R312	200k	0204/7	RESISTOR, European symbol
R313	1M0	0204/7	RESISTOR, European symbol
R314	10k0	0204/7	RESISTOR, European symbol
R1001	8D20	CL60	
V101	KSA992	TO92-ECB	
V102	1N4148	DO35-7	DIODE
V103	1N4148	DO35-10	DIODE
V104	KSC3503	TO126V	
V105	KSA992	TO92-ECB	
V111	BC547C	TO92-CBE	
V201	STP110N8F6	STP110N8F6	
V202	STP110N8F6	STP110N8F6	
V203	STP110N8F6	STP110N8F6	
V204	STP110N8F6	STP110N8F6	
V211	1N4004	DO41-10	DIODE
V212	BD139	TO126AV	NPN TRANSISTOR
V221	STP110N8F6	STP110N8F6	
V222	STP110N8F6	STP110N8F6	
V223	STP110N8F6	STP110N8F6	
V224	STP110N8F6	STP110N8F6	
V231	1N4004	DO41-10	DIODE
V232	BD140	TO126AV	PNP TRANSISTOR
V301	27V	DO35Z10	Z-Diode
V321	STP110N8F6	STP110N8F6	
V322	STP110N8F6	STP110N8F6	
W111	WIRE	CMF-55+9MM	
X101	22-27-2021-02	6410-02	CONNECTOR
X111	64900421122	64900421122	WR-MPC4 4.20mm Male Dual Row Vertical Header, 4 Pins=>Code : Con_WTB_MPC4_2_PCB_64900421122
X144	64900421122	64900421122	WR-MPC4 4.20mm Male Dual Row Vertical Header, 4 Pins=>Code : Con_WTB_MPC4_2_PCB_64900421122
X201	PIN262409-1	62409-1	Flachstecker Typ Tyco/Electronics/AMP TAB, FASTON
X202	PIN262409-1	62409-1	Flachstecker Typ Tyco/Electronics/AMP TAB, FASTON
X203		PAD2MM	
X204		PAD2MM	
X211	64900421122	64900421122	WR-MPC4 4.20mm Male Dual Row Vertical Header, 4 Pins=>Code : Con_WTB_MPC4_2_PCB_64900421122
X221	PIN262409-1	62409-1	Flachstecker Typ Tyco/Electronics/AMP TAB, FASTON
X222	PIN262409-1	62409-1	Flachstecker Typ Tyco/Electronics/AMP TAB, FASTON
X223		PAD2MM	
X224		PAD2MM	
X231	64900421122	64900421122	WR-MPC4 4.20mm Male Dual Row Vertical Header, 4 Pins=>Code : Con_WTB_MPC4_2_PCB_64900421122
X321	PIN262409-1	62409-1	Flachstecker Typ Tyco/Electronics/AMP TAB, FASTON
X322	PIN262409-1	62409-1	Flachstecker Typ Tyco/Electronics/AMP TAB, FASTON
X323		PAD2MM	
X324		PAD2MM	
X1001	PIN262409-1	62409-1	Flachstecker Typ Tyco/Electronics/AMP TAB, FASTON
X1002		PAD2MM	
X1003		PAD2MM	
X2011	SK104	SK104	HEATSINK manufacturer Fischer/distributor Buerklin
X2031	SK104	SK104	HEATSINK manufacturer Fischer/distributor Buerklin

aive · 2019-07-02 9:14 am

Awesome thanks

xrk971 · 2019-07-04 6:06 pm

Here is a nice tool for making perfect wire crimps on the Molex connectors.

The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB

gtose · 2019-07-04 6:37 pm

X, those look nice, I picked up a similar pair of the Engineer PA-20s: Engineer Inc PA-20 Precise Universal Wire Terminal Crimping Tool - Pliers - Amazon.com. These replaced my pair of ratcheting crimpers that never seemed work to get both the insulation and conductor crimped properly at the same time. 2 crimps per termination, but less ruined contacts.

xrk971 · 2019-07-04 7:26 pm

These also have to be done as two separate operations. Vunce also recommended the Engineers which are made in Japan. I got these because they were half the price and were delivered next day for free on Amazon Prime. They work well enough for the price.

xrk971 · 2019-07-05 2:55 pm

I have word from DHL that the ABBB prototype board should be arriving this Monday. Both Vunce and myself are geared up with a BOM and ready to go. We will try to document the build as much as possible to provide a detailed build thread.

gary s · 2019-07-05 11:40 pm

Hi X, that is a good idea seeing the interest in your ABBB design.

We look forward to seeing the thread evolve. All will be satisfied if it even gets close to a 6L6 build guide. No pressure though.

xrk971 · 2019-07-10 5:16 pm

I see that the DHL tracking says that the package has cleared customs in NY. Progress!

Vunce · 2019-07-10 5:25 pm

Fantastic X!!
Did you reserve a forklift to offload the pallet of pcb’s
from the DHL truck

The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB

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