Hi
Can anyone on the forum help ID this component please ?
Please pardon the inexperience,
Markings show A01 05
Searching on the net does not give any results,
Do not have a schematic for this amp,
the position on the board does not specify anything except D18
I cannot test it as it is faulty
It appears to be a Zener diode,
Please see pics
Thank you very much in advance
Can anyone on the forum help ID this component please ?
Please pardon the inexperience,
Markings show A01 05
Searching on the net does not give any results,
Do not have a schematic for this amp,
the position on the board does not specify anything except D18
I cannot test it as it is faulty
It appears to be a Zener diode,
Please see pics
Thank you very much in advance
Attachments
Hmm, and you have no schematic, no name on that a amplifier?
They are in series, they are in close proximity to some power resistors, thinking of Leach amplifier, it used diodes in series to control bias.
Could also be some zener voltage drop.
Test them to see which type of diode it is. A schematic would eliminate all this guessing
To identify which type they are, you can measure the forward voltage of a single diode using a multimeter in diode mode:
A component tester i you have, i use peak atlas, great little device
~0.2–0.3 V: Germanium
~0.6–0.7 V: Silicon
~0.4 V: Schottky
They are in series, they are in close proximity to some power resistors, thinking of Leach amplifier, it used diodes in series to control bias.
Could also be some zener voltage drop.
Test them to see which type of diode it is. A schematic would eliminate all this guessing
To identify which type they are, you can measure the forward voltage of a single diode using a multimeter in diode mode:
A component tester i you have, i use peak atlas, great little device
~0.2–0.3 V: Germanium
~0.6–0.7 V: Silicon
~0.4 V: Schottky
Last edited:
Wow yes, apologies for the pics taken in narrow space with phone, do not have a dedicated camera
The amp is a Conrad Johnson MF5600
Voltage drop with Dmm. 0.567 to 0.568 all remarkably close
Does this help ?
The amp is a Conrad Johnson MF5600
Voltage drop with Dmm. 0.567 to 0.568 all remarkably close
Does this help ?
If they really are in series then removing one isolates them... making it easy to test them.
Tag a 9 volt battery via say a 1k8 resistor across the other two as a series pair and see what the forward volt drop is.
Next reverse the polarity of the battery and tag it across just one diode and see if it behaves as a low voltage Zener or not.
That voltage drop looks very much like standard 1n4148, 1n914,
I believe they are matched, so find one similar or exchange all with new matched ones with similar voltage drop
I believe they are matched, so find one similar or exchange all with new matched ones with similar voltage drop
Can't make the circuit out from that so wouldn't like to second guess. Try what I suggested and see if they are Zener's or not. Are those power devices transistors or voltage regulators.
Guess we have to wait on audioman testing if its zener or diode, it is really difficult to see.
Could be zener reference.
Could be some clamping.
Could be a bias string.
Could be zener reference.
Could be some clamping.
Could be a bias string.
Thank you for the time space and mind space
I will only be able to test this diode some time this weekend
Much Appreciated
I will only be able to test this diode some time this weekend
Much Appreciated
I like solving puzzles... When you have checked let us know.. ohh and if you can a clearer photo of diode area, its hard to see traces, how diodes are connected.
Apologies for the delays
Been placed on standby for a bit of time and cannot get to the testing.
Been placed on standby for a bit of time and cannot get to the testing.