Fisher 400 - Early Model - EFB and IBBA Parts List or BOM?

TravAndAlex

Active Member
Hi All. I've been scouring the forums trying to learn as much as possible about the addition of Dave G's EFB and IBBA for the Fisher 400. Just wondering if I can save myself some work, and ask if anyone who has done those modifications has a Parts List or BOM that they are willing to share?

Thanks in advance!
 
Based on another thread, how does this look for the IBBA? Missing anything?

Mouser #: 652-3362P-1-103LF
Mfr. #: 3362P-1-103LF
Mfr.: Bourns
Trimmer Resistors - Through Hole 1/4"SQ 10KOHMS 10% 0.5WATTS
4 Ships Now
$1.44
$5.76


Mouser #: 647-USV1V100MFD
Mfr. #: USV1V100MFD
Mfr.: Nichicon
Aluminum Electrolytic Capacitors - Leaded 35volts 10uF 5x7 20% 2LS
4 Ships Now
$0.592
$2.37


Mouser #: 660-CF1/4CT52R153J
Mfr. #: CF1/4CT52R153J
Mfr.: KOA Speer
Carbon Film Resistors - Through Hole 15K ohm 5%
4 Ships Now
$0.212
$0.85


Mouser #: 660-CF1/4CT52R103J
Mfr. #: CF1/4CT52R103J
Mfr.: KOA Speer
Carbon Film Resistors - Through Hole 10K ohm 5%
4 Ships Now
$0.212
$0.85


Mouser #: 589-7100-45
Mfr. #: 7100-45
Mfr.: Twin Industries
PCBs & Breadboards .1" Grid .042" Holes 4.0"X 5.0"; FR4
1 Ships Now
$6.60
$6.60


Mouser #: 660-CF1/4CT52R223J
Mfr. #: CF1/4CT52R223J
Mfr.: KOA Speer
Carbon Film Resistors - Through Hole 22K ohm 5%
4 Ships Now
$0.212
$0.85
 
That looks good for the IBBA. Here's are the two key components for the EFB (MOSFET and the two transistors)--the other components are caps, some diodes, and resistors:



512-KSA1013OBU
MFG Part No:KSA1013OBU
KSA1013OBU
Fairchild Bipolar Transistors - BJT
US HTS:8541210095 ECCN:EAR99 COO:KR 4 4


511-STF11N50M2
MFG Part No:STF11N50M2
STF11N50M2
STMicro MOSFET
US HTS:8541290095 ECCN:EAR99 COO:CN 2 2
Dave
 
That looks good for the IBBA. Here's are the two key components for the EFB (MOSFET and the two transistors)--the other components are caps, some diodes, and resistors:



512-KSA1013OBU
MFG Part No:KSA1013OBU
KSA1013OBU
Fairchild Bipolar Transistors - BJT
US HTS:8541210095 ECCN:EAR99 COO:KR 4 4


511-STF11N50M2
MFG Part No:STF11N50M2
STF11N50M2
STMicro MOSFET
US HTS:8541290095 ECCN:EAR99 COO:CN 2 2
Dave


Thanks Dave! I've just got to figure out what those other components are! Going through the other threads to see if I can work it out for my 400. Trying to save on shipping and do it all in a single order.

To be honest, this is much deeper water than I'm used to swimming in... I've been in the shallow end with my soldering iron up to now. :p So I greatly appreciate any help (or spoonfeeding as appropriate). :)
 
Last edited:
Ok. Here goes. I'm really just learning how to read schematics, so I'd appreciate any assistance in double checking this list against the picture of Dave G's schematic.

A couple of initial questions:

Are 1/2 W resistors sufficient unless otherwise indicated on the schematic?
Are all capacitors values in micro farads? (uF)
The schematic is for the late model Fisher 400, what if anything needs to be adjusted for the early model?


Universal EFB.jpg


Mouser #: 512-KSA1013OBU
Mfr. #: KSA1013OBU
Mfr.: Fairchild Semiconductor
Bipolar Transistors - BJT PNP Epitaxial Sil
2 Ships Now
$0.522
$1.04


Mouser #: 511-STF11N50M2
Mfr. #: STF11N50M2
Mfr.: STMicroelectronics
MOSFET POWER MOSFET
1 Ships Now
$2.48
$2.48


Mouser #: 594-5083NW2K200J
Mfr. #: PR02000202201JR500
Mfr.: Vishay
Metal Film Resistors - Through Hole 2watts 2.2Kohms 5%
1 Ships Now
$0.479
$0.48


Mouser #: 273-22K-RC
Mfr. #: 273-22K-RC
Mfr.: Xicon
Metal Film Resistors - Through Hole 22Kohms 1% 50PPM
1 Ships Now
$0.31
$0.31


Mouser #: 273-39K-RC
Mfr. #: 273-39K-RC
Mfr.: Xicon
Customer #:
Metal Film Resistors - Through Hole 39Kohms 1% 50PPM
1 Ships Now
$0.31
$0.31


Mouser #: 273-1.0M-RC
Mfr. #: 273-1.0M-RC
Mfr.: Xicon
Metal Film Resistors - Through Hole 1.0Mohms 1% 50PPM
1 Ships Now
$0.31
$0.31


Mouser #: 273-100K-RC
Mfr. #: 273-100K-RC
Mfr.: Xicon
Metal Film Resistors - Through Hole 100Kohms 1% 50PPM
1 Ships Now
$0.31
$0.31


Mouser #: 594-5073NW270K0J
Mfr. #: PR01000102703JR500
Mfr.: Vishay
Metal Film Resistors - Through Hole 1watt 270Kohms 5%
1 Ships Now
$0.254
$0.25


Mouser #: 71-CCF02-F-909
Mfr. #: CCF02909RFKR36
Mfr.: Vishay
Metal Film Resistors - Through Hole 2watts 909ohms 1%
-->NOTE: 2 to be wired in series for the 1.8k 4W
2 Ships Now
$1.16
$2.32


Mouser #: 273-10K-RC
Mfr. #: 273-10K-RC
Mfr.: Xicon
Metal Film Resistors - Through Hole 10Kohms 1% 50PPM
1 Ships Now
$0.31
$0.31


Mouser #: 80-PHE450PF6470JF13
Mfr. #: PHE450PF6470JF13R06L2
Mfr.: Kemet
Film Capacitors .47uF 1000V 5%
1 Ships Now
$3.47
$3.47


Mouser #: 647-UVR2W220MHD
Mfr. #: UVR2W220MHD
Mfr.: Nichicon
Aluminum Electrolytic Capacitors - Leaded 450volts 22uF 16x25 20% 7.5LS
1 Ships Now
$1.45
$1.45


Mouser #: 594-2222-368-25224
Mfr. #: BFC236825224
Mfr.: Vishay
Film Capacitors .22UF 10% 100volts
1 Ships Now
$1.16
$1.16


Mouser #: 505-MKS2C044701M00KS
Mfr. #: MKS2C044701M00KSSD
Mfr.: WIMA
Film Capacitors 4.7 uF 63 VDC 10%
1 Ships Now
$1.30
$1.30


Mouser #: 512-1N4007
Mfr. #: 1N4007
Mfr.: Fairchild Semiconductor
Rectifiers 1000V GEN PUR RPLMNT P/N 863-1N4007RLG
4 Ships Now
$0.226
$0.90


Mouser #: 75-TVA1414-E3
Mfr. #: TVA1414-E3
Mfr.: Vishay
Aluminum Electrolytic Capacitors - Leaded 50uF 150volts
1 Ships Now
$7.56
$7.56


Mouser #: 652-3362P-1-103LF
Mfr. #: 3362P-1-103LF
Mfr.: Bourns
Trimmer Resistors - Through Hole 1/4"SQ 10KOHMS 10% 0.5WATTS
1 Ships Now
$1.44


Mouser #: 589-7100-45
Mfr. #: 7100-45
Mfr.: Twin Industries
PCBs & Breadboards .1" Grid .042" Holes 4.0"X 5.0"; FR4
RoHS Compliant
QuickView
1 Ships Now
$6.60
 
Last edited:
Dave G was good enough to email me and clear up a few of my mistakes and give me some new values for the early model 400 (his original circuits are for the late model 400). For anyone who may find this useful, here's the details of my order:


FISHER 400 EARLY MODEL - IBBA AND EFB
Mouser # Mfr. # Manufacturer Description Order Qty. Price (CAD) Ext.: (CAD)
652-3362P-1-103LF 3362P-1-103LF Bourns Trimmer Resistors - Through Hole 1/4"SQ 10KOHMS 10% 0.5WATTS 3 $1.44 $4.32
647-USV1V100MFD USV1V100MFD Nichicon Aluminum Electrolytic Capacitors - Leaded 35volts 10uF 5x7 20% 2LS 4 $0.592 $2.37
660-CF1/4CT52R153J CF1/4CT52R153J KOA Speer Carbon Film Resistors - Through Hole 15K ohm 5% 4 $0.212 $0.85
660-CF1/4CT52R103J CF1/4CT52R103J KOA Speer Carbon Film Resistors - Through Hole 10K ohm 5% 4 $0.212 $0.85
589-7100-45 7100-45 Twin Industries PCBs & Breadboards .1" Grid .042" Holes 4.0"X 5.0"; FR4 2 $6.60 $13.20
660-CF1/4CT52R223J CF1/4CT52R223J KOA Speer Carbon Film Resistors - Through Hole 22K ohm 5% 4 $0.212 $0.85
271-18.7K-RC 271-18.7K-RC Xicon Metal Film Resistors - Through Hole 18.7Kohms 1% 50PPM 2 $0.24 $0.48
506-A101SYCQ04 A101SYCQ04 TE Connectivity Toggle Switches ON-ON SPDT Bat Long 1 $3.96 $3.96
512-KSA1013OBU KSA1013OBU Fairchild Semiconductor Bipolar Transistors - BJT PNP Epitaxial Sil 2 $0.522 $1.04
511-STF11N50M2 STF11N50M2 STMicroelectronics MOSFET POWER MOSFET 1 $2.48 $2.48
594-5083NW2K200J PR02000202201JR500 Vishay Metal Film Resistors - Through Hole 2watts 2.2Kohms 5% 1 $0.479 $0.48
273-22K-RC 273-22K-RC Xicon Metal Film Resistors - Through Hole 22Kohms 1% 50PPM 1 $0.31 $0.31
273-39K-RC 273-39K-RC Xicon Metal Film Resistors - Through Hole 39Kohms 1% 50PPM 1 $0.31 $0.31
273-1.0M-RC 273-1.0M-RC Xicon Metal Film Resistors - Through Hole 1.0Mohms 1% 50PPM 1 $0.31 $0.31
273-100K-RC 273-100K-RC Xicon Metal Film Resistors - Through Hole 100Kohms 1% 50PPM 5 $0.31 $1.55
594-5073NW270K0J PR01000102703JR500 Vishay Metal Film Resistors - Through Hole 1watt 270Kohms 5% 1 $0.254 $0.25
273-10K-RC 273-10K-RC Xicon Metal Film Resistors - Through Hole 10Kohms 1% 50PPM 1 $0.31 $0.31
80-PHE450PF6470JF13 PHE450PF6470JF13R06L2 Kemet Film Capacitors .47uF 1000V 5% 1 $3.47 $3.47
647-UVR2W220MHD UVR2W220MHD Nichicon Aluminum Electrolytic Capacitors - Leaded 450volts 22uF 16x25 20% 7.5LS 1 $1.45 $1.45
594-2222-368-25224 BFC236825224 Vishay Film Capacitors .22UF 10% 100volts 1 $1.16 $1.16
505-MKS2C044701M00KS MKS2C044701M00KSSD WIMA Film Capacitors 4.7 uF 63 VDC 10% 1 $1.30 $1.30
512-1N4007 1N4007 Fairchild Semiconductor Rectifiers 1000V GEN PUR RPLMNT P/N 863-1N4007RLG 4 $0.226 $0.90
75-TVA1414-E3 TVA1414-E3 Vishay Aluminum Electrolytic Capacitors - Leaded 50uF 150volts 1 $7.56 $7.56
660-MF1/2DCT52R5602D MF1/2DCT52R5602D KOA Speer Metal Film Resistors - Through Hole 1/2 WATT 56K OHM .5% 1 $0.888 $0.89
294-130K-RC 294-130K-RC Xicon Carbon Film Resistors - Through Hole 130Kohms 5% 2 $0.324 $0.65
294-10K-RC 294-10K-RC Xicon Carbon Film Resistors - Through Hole 10Kohms 0.05 1 $0.324 $0.32
71-ROX1-F-1K ROX1001K00FKLB Vishay Metal Oxide Resistors 4watt 1Kohm 1% 100ppm 1 $5.89 $5.89
 
Hi, Luis. I'll jump in, owning a late-model 400. The late models have high impedance output transformers (10.5K primaries) and the NFB components are accordingly different (the R/C components--caps and resistors in the feedback network). Those are the main ones, and I don't recall others. Other's may weigh in on this. The different OPT's limit the power to about 23-24WRMS per channel.
Dave
 
Hello Dave

Sorry for the misunderstanding, I'm asking is regarding the efb, because as you mentioned the OPT are different and also the feedback network coming from the 16 ohm and other stuff, just curious due to I have also a 400 earlier model where I would like to do as made in my 400 late model.
Regards.

Luis.
 
Last edited:
I'm sorry, Luis--my mistake. As far as differences in the EFB, I can't answer. The posts above hint that there are a couple of differences, but TravAndAlex would need to let you know.
Dave
 
Sorry for the late reply. Missed your question. Here's what Dave G sent me:


Hi Trav — You’ve got a number of component value errors, because as I had previously mentioned, the published EFB values were based on the LATE model 400, not the early model, which operates the output stage quite differently.


I have not done any actual development work with the EFB circuit for the early model 400s, but some quick napkin type calculations gave me this, which should get you if not in the ball park, very close to it. Unless other wise specifically mentioned, the parts are fine except for the following:


A. Within the EFB circuits:


1. The 39K resistor becomes 56K of same type and wattage.


2. The 100K resistor becomes 39K of same type and wattage.


3. The 270K resistor remains the same value, be becomes upgraded to a 2 watt rating.


4. The 1.8K resistor becomes a 1K of the same type and wattage.


5. If you are using the IBBA bias adjusting circuit after the EFB control grid regulator, then the 10K resistor and 4.7uF cap can be omitted.



B. Within the IBBA circuits:


1. Only 2 10K resistors are required, where as you are showing 4.


2. What are the 22K resistors for?


Also, the unit will need to have 10 Ohm .5 watt resistors installed at each pin 5 of the output tubes, so if those are not currently installed, then you will need to order those as well.


You should also strongly consider adding 100 Ohm .5 watt Screen Stability resistors to the output tubes (one per tube socket) as well (if not already done). These are not shown with the late version modified schematic that I provided, because the way that the late version output stage operates, they are not needed. However, with in the early version units, they are strongly recommended.


These changes should get you very close, if not at your goal. At best, only a slight tweak or two may be needed once you get your project up and operational. Good luck with it!



I still haven't tackled this project yet. Please let me know if you can share the details! I ordered the parts, but haven't found the time to try it yet.
 
Can anyone comment on EFB differences for a KX-200 which is about to be in my possession? I've got 2 different schematics for a 400B, one dated Nov 19 2012, another dated Mar 24 2013 and titled "Universal EFB". Thanks. Thorne
 
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