gar381
Well-known member
NOTICE OF PART CHANGE 10/5/23
Had to happen sometime... The pnp BC560C has been out of production
for some time now and my current supply of NOS Fairchild BC560Cs
that I have been using for last 3 years is running very low. I will be using
the remainder of my supply for only for the matched pnp input pairs for the
garOA10 and gar918.
I knew this day was coming so I have auditioned many possibilities.
From now on I will only be using..
BC557C mouser # 637-BC557C in the following positions...
gar2520 Q6, Q9.
gar1731 Q3, Q4
garAM10 Q1,Q5,Q6,Q7
garOA10 Q2, Q3, Q5, Q7, Q9
gar918 Q3, Q4
Note that these are all on tape and will just drop in place to the silk
just like the original BC560C
Gary
NOTE TO FOLKS SOURCING THEIR OWN PARTS..1/27/2020
The BC560C is no longer being manufactured. If you can
Not source these, with lots of listening time with lots of different
PNP transistors, we have come up with suitable replacements.
gar2520 Q6 and Q9
gar1731 Q3 and Q4
garAM10 Q1, Q5, Q6, and Q7
(gar918 and the gar OA10 will have other recommended replacements)
New First choice Mouser part # 637-BC557C
First choice BC32740TA Mouser Part# 512-BC32740TA
Second choice BC557BF Mouser Part# 512-BC557BTF
Note that both of these transistors have the same pinout as the BC560C
So you should be able to just drop them in place using the silk on the pcb.
If you want to experiment with other PNPs, Make shure the Vceo max
Is at least 45v. hfe is not all that important for these PNPs but above 250
Will work fine. Just be aware of pinout.
All of my kits until future notice, BC560Cs will be included in the kits.
The garAM10BC DOA will work from +/- 15V thru +/-24V so it is a
Happy camper on any VPR or 51X standard.
INFORMATION COMMON TO BUILDING ANY gar DOA....
PLEASE ALWAYS REFURE TO THE APPROPRIATE ASSEMBLY MANUAL WHEN ASSEMBLING gar DOAs. Either print it out or have the pdf open on your desktop. This will help both the novice and ProTech alike from accidentally making assembly errors.
Note that the OUTPUT transistors are NOT the same. One is a NPN and the other is a PNP. Make sure that they are in the correct positions and facing the correct direction
As shown in the assembly manual.
Note the BLUE Murata caps are all different values. Make sure you got the correct
cap in the correct positions as shown in the assembly manual.
Note that the DIODES are polarized. Make sure that the black band on the diode is in
The hole with the circle. Note the diode pads on the PCB are square shaped. They are the ONLY square pads on the PCB.
All BC560C transistors are on tape. ( Except for the Match Pair in the gar918BC kit. Those are in a little bag with the Millmax pins) The pads on the PCB are in a straight line ( except gar918) for The BC560Cs and only for these, so that they will not be confused with the BC550C pads. Make sure they are facing the correct way as shown on the silkscreen.
All BC550Cs transistors are in little bags. One of the bags is for the MATCHED input pair (except for the gar918BC kit) and this bag will also include the Millmax pins. Do not remove the transistors from this bag until installing them so they do not get mixed up with the other BC550C transistors in the kit. All BC550C pads on the pcb are in a triangle formation so as not to be confused with the straight line BC560C pads. Make sure they are facing the correct way as shown on the silkscreen.
Measure all RESISTOR values at installation and install according to the manual. Be careful when measuring values above 100k so you will not be including your skin resistance in the measurement.
Before testing your fresh assembled DOA, double check for unwanted solder bridges as shown In the manual and make sure that no component leads on the component side of the PCB are touching each other.
As these are all the most common assembly errors. Following this basic informational
Guide should result in a successful build and your new DOA should work first time out of the box.
When inserting your new DOA into the millmax sockets of a module, Please insert straight down and not at an angle.
DO NOT push down on the component parts but use the edges of the DOAs PCB. Remove DOAs the same way.
Pull straight up from the edges of the PCB and not at an angle. Never insert a DOA or a module with the power on.
Note on part substitutions in kits .....
Occasionally the parts listed in the BOM of each kit maybe temporarily unavailable from my parts supplier. A substitution
Part will be included in the kit. These parts will be of the same value, tolerance And quality of the part listed in the BOM.
For you folks sourcing your own parts For your builds, All the ¼ watt resistors use any major brand 1% metal film.
The ½ watt resistors can be any major brand carbon film or metal film 5% or better.
The Murata caps can be 50v or 100v 5%. Any major brand npo/cog 5% with the lead spacing of .1” or 2.5mm can be used if necessary. Output transistors can be ON semi, Fairchild or ST micro transistors. Note that the ST micro transistors have a slightly different Package but will drop right in the PCB just fine.
Had to happen sometime... The pnp BC560C has been out of production
for some time now and my current supply of NOS Fairchild BC560Cs
that I have been using for last 3 years is running very low. I will be using
the remainder of my supply for only for the matched pnp input pairs for the
garOA10 and gar918.
I knew this day was coming so I have auditioned many possibilities.
From now on I will only be using..
BC557C mouser # 637-BC557C in the following positions...
gar2520 Q6, Q9.
gar1731 Q3, Q4
garAM10 Q1,Q5,Q6,Q7
garOA10 Q2, Q3, Q5, Q7, Q9
gar918 Q3, Q4
Note that these are all on tape and will just drop in place to the silk
just like the original BC560C
Gary
NOTE TO FOLKS SOURCING THEIR OWN PARTS..1/27/2020
The BC560C is no longer being manufactured. If you can
Not source these, with lots of listening time with lots of different
PNP transistors, we have come up with suitable replacements.
gar2520 Q6 and Q9
gar1731 Q3 and Q4
garAM10 Q1, Q5, Q6, and Q7
(gar918 and the gar OA10 will have other recommended replacements)
New First choice Mouser part # 637-BC557C
First choice BC32740TA Mouser Part# 512-BC32740TA
Second choice BC557BF Mouser Part# 512-BC557BTF
Note that both of these transistors have the same pinout as the BC560C
So you should be able to just drop them in place using the silk on the pcb.
If you want to experiment with other PNPs, Make shure the Vceo max
Is at least 45v. hfe is not all that important for these PNPs but above 250
Will work fine. Just be aware of pinout.
The garAM10BC DOA will work from +/- 15V thru +/-24V so it is a
Happy camper on any VPR or 51X standard.
INFORMATION COMMON TO BUILDING ANY gar DOA....
PLEASE ALWAYS REFURE TO THE APPROPRIATE ASSEMBLY MANUAL WHEN ASSEMBLING gar DOAs. Either print it out or have the pdf open on your desktop. This will help both the novice and ProTech alike from accidentally making assembly errors.
Note that the OUTPUT transistors are NOT the same. One is a NPN and the other is a PNP. Make sure that they are in the correct positions and facing the correct direction
As shown in the assembly manual.
Note the BLUE Murata caps are all different values. Make sure you got the correct
cap in the correct positions as shown in the assembly manual.
Note that the DIODES are polarized. Make sure that the black band on the diode is in
The hole with the circle. Note the diode pads on the PCB are square shaped. They are the ONLY square pads on the PCB.
All BC560C transistors are on tape. ( Except for the Match Pair in the gar918BC kit. Those are in a little bag with the Millmax pins) The pads on the PCB are in a straight line ( except gar918) for The BC560Cs and only for these, so that they will not be confused with the BC550C pads. Make sure they are facing the correct way as shown on the silkscreen.
All BC550Cs transistors are in little bags. One of the bags is for the MATCHED input pair (except for the gar918BC kit) and this bag will also include the Millmax pins. Do not remove the transistors from this bag until installing them so they do not get mixed up with the other BC550C transistors in the kit. All BC550C pads on the pcb are in a triangle formation so as not to be confused with the straight line BC560C pads. Make sure they are facing the correct way as shown on the silkscreen.
Measure all RESISTOR values at installation and install according to the manual. Be careful when measuring values above 100k so you will not be including your skin resistance in the measurement.
Before testing your fresh assembled DOA, double check for unwanted solder bridges as shown In the manual and make sure that no component leads on the component side of the PCB are touching each other.
As these are all the most common assembly errors. Following this basic informational
Guide should result in a successful build and your new DOA should work first time out of the box.
When inserting your new DOA into the millmax sockets of a module, Please insert straight down and not at an angle.
DO NOT push down on the component parts but use the edges of the DOAs PCB. Remove DOAs the same way.
Pull straight up from the edges of the PCB and not at an angle. Never insert a DOA or a module with the power on.
Note on part substitutions in kits .....
Occasionally the parts listed in the BOM of each kit maybe temporarily unavailable from my parts supplier. A substitution
Part will be included in the kit. These parts will be of the same value, tolerance And quality of the part listed in the BOM.
For you folks sourcing your own parts For your builds, All the ¼ watt resistors use any major brand 1% metal film.
The ½ watt resistors can be any major brand carbon film or metal film 5% or better.
The Murata caps can be 50v or 100v 5%. Any major brand npo/cog 5% with the lead spacing of .1” or 2.5mm can be used if necessary. Output transistors can be ON semi, Fairchild or ST micro transistors. Note that the ST micro transistors have a slightly different Package but will drop right in the PCB just fine.
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