No HV on tek 465
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magaudiolab
Hi all,
my tek 465 suddenly stopped working... The problem is clearly on HV circuitry since there is no HV at all. After some checking I found that at least CR1421 was broken (open diode). It is a Varo vg12x diode (1200V, 5mA, max fwd 30V) but I have found no equivalent around the web. Can someone help me? Thanks
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Jerry Massengale <jmassen418a@...>
Hi,
See 160558092700 on feebay.
jerry
-----Original Message----- From: magaudiolab To: TekScopes Sent: Sat, Jul 2, 2011 11:38 am Subject: [TekScopes] No HV on tek 465 Hi all,
my tek 465 suddenly stopped working... The problem is clearly on HV circuitry since there is no HV at all. After some checking I found that at least CR1421 was broken (open diode). It is a Varo vg12x diode (1200V, 5mA, max fwd 30V) but I have found no equivalent around the web. Can someone help me? Thanks
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Mendel Pearl <mypearl@...>
I can send you one for free, but I am in Holland. I think it will fit a standard letter so cost should be no issue.
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Let me know if you want one. Mendel
On 2-7-2011 18:38, magaudiolab wrote:
Hi all,
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--- In TekScopes@..., "magaudiolab" <v.maglietta@...> wrote:
How did you determine it was open ? This diode (152-0409-00) has forward drop of about 9 V at 1 mA so it can not be checked with a normal DMM. /Håkan
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J. L. Trantham
When I
have tested similar diodes (although lower voltage, about 5 KV) I had to use a
power supply through a resistor to drive the diode forward to see the current
flow since my DMM couldn't produce enough forward voltage to 'turn on' the
diode. Which DMM are you using?
Joe
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--- In TekScopes@..., "J. L. Trantham" <jltran@...> wrote:
576 curve tracer /Håkan
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J. L. Trantham
Oh.
Joe
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magaudiolab
--- In TekScopes@..., "Hakan H" <hahi@...> wrote:
Hi Håkan, I did not use DMM at all, but a D-R series circuit (R being 22k so current max should never exceed 3mA) powered by a variable power supply (up to 60V). Diode never showed any measurable conduction at all. If any, current is below .01uA. Far way from 9V @ 1mA as you stated. If it is not opened, it is likely to be a leaky diode.
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magaudiolab
Thank you so much Mendel!
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I am still checking HV (hoping to find my good old HV probe ASAP. I had one in my lab but I have not used it for so long... God knows where is it now!). I will use 2CL73 (easy to find) which seems a valid alternative, if it should work I will let to know. Valerio
--- In TekScopes@..., Mendel Pearl <mypearl@...> wrote:
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