Hard to find diode...

[Netlist]

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]

Hi Hugo!

From the prefix DZ maybe a Zenner diode!!!

Merry Christmas

 

[Netlist]

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]

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

 

[Netlist]

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]

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]

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]

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

 

[Marcelo Guedes]

Dear friends,
can you help me? I need to replace the diode DZ890522B OR THE S2 13886 of the BOX of the Peavey combo 115, I live in Brazil and Peavey here only sells to her technical assistance. I ask anyone who knows an address where I can buy this diode I am very grateful, the box belongs to my church.

thanks you

 

[JMFahey]

WHICH Peavey Combo 115?
Thatb amplifier has been made for decades, from 60 to 600W RMS, most conventional but the latest ones Class D.
Probably some 20 different schematics in total..

1) when did you buy it?

2) what does that diode do? At least show a picture

3) write PEAVEY USA at their Service Department, stating your amplifier full model and specially serial number so they Email you the proper schematic, then upload it here.

Even if it has a "house number", by seeing what it does we can suggest a replacement.

 

[Osvaldo de Banfield]

It seems to be two diodes in series, like 1N4007 or the like.