Help me identify this?

peace brainerd · 26th July 2006, 05:51 PM

I'm about to put in an order for some parts to repair an older hitachi
amp. On the preamp section is a little diode that is physically broken.
I'm having a hard time cross referencing it. The board is marked CR-12
(control rectifier 12?).

It is a barrel shaped axial-lead pellet (2.5mm x 3.5mm) of white ceramic with a brown stripe on one end. It is marked N 1 6 followed by the hitachi symbol. I'm not well versed in electronics, but I've seen hundreds of these thing on boards, yet I cannot find a similar image online. None of the parts suppliers can cross ref it. Hitachi cannot help me. A local "electronics guy" doesn't know what to make of N 1 6.

Anyone know what common diode I can safely replace this with?

davidallancole · 26th July 2006, 06:44 PM

I would try replacing it with a diode of similar physical size.

kubeek · 26th July 2006, 08:35 PM

It also could be some zener diode, so better look carefully at the circuit and try to find out what was it there for.

Netlist · 26th July 2006, 09:03 PM

To be real sure you need the service manual and part list.
However, this might be of any help:
N16 = SM-1XN16 =SM-1XN02: 1600V
SM-1XN02: Gl, Uni, 200V, 1A
Can be replaced by:
DM513, EM516, GP10Y, RGP15-16

/Hugo

davidallancole · 26th July 2006, 09:53 PM

Is there other diodes on the board with the same markings? You could pull it off and run some tests on it to see what it is for sure.

Enzo · 27th July 2006, 12:05 AM

Diodes are usually called out as CR or D numbers on schematics.

D is obvious - diode

CR is an old term that hangs on by tradition - it means Crystal Rectifier.

In your case, what does the diode do in the circuit. In the preamp it is unlikely to be a tunnel diode or something, so it is either a rectifier or blocking device, or it is a zener.

peace brainerd · 27th July 2006, 02:34 PM

This may be the only image available of the little culprit on the web.

But this is exactly what it looks like. Component without leads is 2.5mm x 3.5mm. Mine is off-white with a brown band at the cathode end.

There are half a dozen more of them on the board, all hitachi, with varying numbers (values?) on them.

This is really starting to worry me.

peace brainerd · 27th July 2006, 05:00 PM

I measured .60v drop across the diode.
Someone suggested this is in the range
of a common silicon switching diode.

But they also suggested that in matching
it I pay attention to the peak inverse voltage,
peak fwd current, and Trr (reverse recovery time)
/ switching time.

Good lord. This is troublesome little
devil.

Gandalph · 3rd August 2006, 02:30 PM

"There are half a dozen more of them on the board, all hitachi, with varying numbers (values?) on them. "

These could be zener diodes, with differing voltages. Remember, most zener diodes have a forward voltage drop of 0.7 V, it is the reverse voltage that is the diode's 'Voltage'

Richard

Netlist · 3rd August 2006, 03:54 PM

What is the type# of the amp?
I might have some data.

/Hugo

26th July 2006, 05:51 PM	#1
peace brainerd diyAudio Member Join Date: Nov 2004	Help me identify this? I'm about to put in an order for some parts to repair an older hitachi amp. On the preamp section is a little diode that is physically broken. I'm having a hard time cross referencing it. The board is marked CR-12 (control rectifier 12?). It is a barrel shaped axial-lead pellet (2.5mm x 3.5mm) of white ceramic with a brown stripe on one end. It is marked N 1 6 followed by the hitachi symbol. I'm not well versed in electronics, but I've seen hundreds of these thing on boards, yet I cannot find a similar image online. None of the parts suppliers can cross ref it. Hitachi cannot help me. A local "electronics guy" doesn't know what to make of N 1 6. Anyone know what common diode I can safely replace this with?

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26th July 2006, 06:44 PM	#2
davidallancole diyAudio Member Join Date: Nov 2005	I would try replacing it with a diode of similar physical size.

26th July 2006, 08:35 PM	#3
kubeek diyAudio Member Join Date: Dec 2005 Location: Prague, Czech Rep	It also could be some zener diode, so better look carefully at the circuit and try to find out what was it there for.

26th July 2006, 09:03 PM	#4
Netlist diyAudio Moderator Join Date: Jan 2003	To be real sure you need the service manual and part list. However, this might be of any help: N16 = SM-1XN16 =SM-1XN02: 1600V SM-1XN02: Gl, Uni, 200V, 1A Can be replaced by: DM513, EM516, GP10Y, RGP15-16 /Hugo

26th July 2006, 09:53 PM	#5
davidallancole diyAudio Member Join Date: Nov 2005	Is there other diodes on the board with the same markings? You could pull it off and run some tests on it to see what it is for sure.

27th July 2006, 12:05 AM	#6
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Diodes are usually called out as CR or D numbers on schematics. D is obvious - diode CR is an old term that hangs on by tradition - it means Crystal Rectifier. In your case, what does the diode do in the circuit. In the preamp it is unlikely to be a tunnel diode or something, so it is either a rectifier or blocking device, or it is a zener.

27th July 2006, 02:34 PM	#7
peace brainerd diyAudio Member Join Date: Nov 2004	This may be the only image available of the little culprit on the web. But this is exactly what it looks like. Component without leads is 2.5mm x 3.5mm. Mine is off-white with a brown band at the cathode end. There are half a dozen more of them on the board, all hitachi, with varying numbers (values?) on them. This is really starting to worry me.

27th July 2006, 05:00 PM	#8
peace brainerd diyAudio Member Join Date: Nov 2004	I measured .60v drop across the diode. Someone suggested this is in the range of a common silicon switching diode. But they also suggested that in matching it I pay attention to the peak inverse voltage, peak fwd current, and Trr (reverse recovery time) / switching time. Good lord. This is troublesome little devil.

3rd August 2006, 02:30 PM	#9
Gandalph diyAudio Member Join Date: Dec 2005 Location: Norfolk	"There are half a dozen more of them on the board, all hitachi, with varying numbers (values?) on them. " These could be zener diodes, with differing voltages. Remember, most zener diodes have a forward voltage drop of 0.7 V, it is the reverse voltage that is the diode's 'Voltage' Richard

3rd August 2006, 03:54 PM	#10
Netlist diyAudio Moderator Join Date: Jan 2003	What is the type# of the amp? I might have some data. /Hugo

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