Hard to find diode...

Netlist · 24th December 2003, 04:33 PM

Anyone heard about a double diode DZ89052?
It comes from the bias circuit of a Peavey CS800 amp.
Of course I can order it at Peavey but it might take 6 weeks.
More info written on the diode:
DZ89052
2B MSC
Drawing:
---->|->|----
Looks like a normal 1N4007.

Thanks

/Hugo - who wishes everybody a Merry Christmas.

Tube_Dude · 24th December 2003, 04:38 PM

Hi Hugo!

From the prefix DZ maybe a Zenner diode!!!

Merry Christmas

Netlist · 25th December 2003, 09:57 AM

Thanks Jorge
From the schematic and what I measure it's not a Zener.
Like many Peavey parts, I think it's made exclusively for them.
I still have one spare and will order a few more. For now I can fix the amp.

/Hugo

SkinnyBoy · 25th December 2003, 11:43 AM

wouldn't it jut be the same as 2 diodes in series?

Netlist · 25th December 2003, 12:29 PM

Right now I'm testing with two 1N4006 in series.
If the bias behaves on the test bench for a few days I might leave it as is.
But first I want him to cook a few hours on the resistor load

/Hugo

moamps · 9th January 2004, 08:22 PM

Quote:

Originally posted by Netlist
From the schematic and what I measure it's not a Zener.
Like many Peavey parts, I think it's made exclusively for them.
I still have one spare and will order a few more. For now I can fix the amp.

Hi Hugo,

I have one "dead" Peavey CS800 and need to fix it. According to your posts, you have the schematic for this amp. Is there any chance you could send me the schematic (by post or e-mail)?

Thanks in advance

Christer · 9th January 2004, 10:19 PM

Hugo,

I suppose the diode is defective, or assumed so, so you can't
measure it. However, unless it is a monoblock, perhaps you
could desolder the same diode from the other channel and
measure if it has a characteristic like two diodes in series?
If so, I suppose you could find two diodes that mimic the
same behaviour and use these.

Netlist · 4th February 2004, 08:31 PM

Quote:

Originally posted by Christer
Hugo,

I suppose the diode is defective, or assumed so, so you can't
measure it. However, unless it is a monoblock, perhaps you
could desolder the same diode from the other channel and
measure if it has a characteristic like two diodes in series?
If so, I suppose you could find two diodes that mimic the
same behaviour and use these.

Thanks Christer,
Indeed they measure like two series diodes and on the schematic they are drawn like that too.
So the two 1N4006's did the job, bias was ok after warming up and the amp withstood a nice little live performance last week.

/Hugo

24th December 2003, 04:33 PM	#1
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Hard to find diode... Anyone heard about a double diode DZ89052? It comes from the bias circuit of a Peavey CS800 amp. Of course I can order it at Peavey but it might take 6 weeks. More info written on the diode: DZ89052 2B MSC Drawing: ---->\|->\|---- Looks like a normal 1N4007. Thanks /Hugo - who wishes everybody a Merry Christmas.

24th December 2003, 04:38 PM	#2
Tube_Dude diyAudio Member Join Date: Mar 2002 Location: Aveiro-Portugal	Hi Hugo! From the prefix DZ maybe a Zenner diode!!! Merry Christmas __________________ Jorge

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25th December 2003, 09:57 AM	#3
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Thanks Jorge From the schematic and what I measure it's not a Zener. Like many Peavey parts, I think it's made exclusively for them. I still have one spare and will order a few more. For now I can fix the amp. /Hugo

25th December 2003, 11:43 AM	#4
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	wouldn't it jut be the same as 2 diodes in series?

25th December 2003, 12:29 PM	#5
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Right now I'm testing with two 1N4006 in series. If the bias behaves on the test bench for a few days I might leave it as is. But first I want him to cook a few hours on the resistor load /Hugo

9th January 2004, 10:19 PM	#7
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	Hugo, I suppose the diode is defective, or assumed so, so you can't measure it. However, unless it is a monoblock, perhaps you could desolder the same diode from the other channel and measure if it has a characteristic like two diodes in series? If so, I suppose you could find two diodes that mimic the same behaviour and use these.