D901

Short answer - NTE558

Here is a message from back in 1997 when I had a similar problem. (Mine had
had a cap kit installed wrong, with ZD901 put in D901's spot. Needless to
say it didn't work. :-)

Is Greg Woodcock still around, and has the FAQ been updated since then ? I
think this was going to be added to it.

---------- Forwarded message ----------
Date: Fri, 26 Sep 1997 13:52:48 -0400 (EDT)
From: Christopher X. Candreva <chris@westnet.com>
To: vectorlist@goonsquad.spies.com
Subject: Re: Diode cross-ref check ?

On Thu, 25 Sep 1997, John Robertson wrote:

> You MUST use a FAST diode, regular 1N400X diodes will not work in this
> application, they are designed for low frequency work. Diodes called "Damper
> Diodes" are what are needed here. A sample number would be ECG525 or MB1F or
> ITH61 or GH-3F. These are rated at 2,000 volts (a bit of overkill) but are fast

I did some more checking since I last posted. That GH-3F crosses to a NTE558
-- which IS readily available (Mouser had it in stock). They had
backordered the 551, so I just switched that order. The 558 looks like an
even better fit actually, since it is in a DO-41 case instead of an aluminum
case.

The moral of our story is kids:

1) Always double check the part number BEFORE installing a part, and make
sure you are putting it in the right location. I still do the old Heathkit
trick of taping my parts down to a piece of paper with the part number and
circuit location number written on it.

2) When you acquire non-working equipment, ALWAYS suspect the previous
person's work. If it he tried to fix it and it still has problems -- there
is probably a reason.

-Chris

==========================================================
Chris Candreva -- chris@westnet.com -- (914) 967-7816
WestNet Internet Services of Westchester
http://www.westnet.com/

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Received on Fri Jan 4 16:05:57 2002