Need flyback diode for H-19

[James Wolf]

You should be able to use one from a home food microwave oven.

How did you test it to determine it has failed?   A simple VTVM test in diode mode will show as an open on a good diode.  You have to measure the voltage through it.   Connect a power supply (12VDC should be fine) one side of the diode and measure the voltage on the open end of the diode.  Reverse the power supply leads and measure again.  One direction will have a few volts of drop and the other direction should be open.

Jim - KR9U




-----Original Message-----
From: Tacos [mailto:tacos-bounces+jbwolf=comcast.net at amrad.org] On Behalf Of Terry Fox
Sent: Thursday, November 22, 2018 11:21 PM
To: tacos at amrad.org
Subject: Need flyback diode for H-19

One of my Heathkit H-19 terminals has died.  After a lot of troubleshooting, 
it appears that the diode in the high-voltage connection to the CRT has gone 
bad.  It is connected to the flyback transformer, then to the HV connection 
on the bottle.  I believe the flyback xfmr itself is fine.

Does anyone know where I can pick up a high-voltage diode that is suitable 
for old CRTs?  I've been googling and looking at ebay without any luck so 
far.  With everything gone to LCDs. it's difficult to find these parts.

Go CP/M!
73, Terry, N4TLF

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