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HP8640B output amplifier failure
I've seen HP numbers cross referenced to 2Nxxxx, but where I can't recall.
Have you tried Google? Also ask on the boatanchor group. good luck 73 hank wd5jfr "Yrrah" wrote in message ... On a hot summer night the output of my 8640B suddenly disappeared. Later I learned that the output amp (marked 5086-7068) had failed. Any idea where to get a replacement? Apart from buying a second generator off course. Any help will be appreciated. regards, Harke PA0HRK |
I've seen HP numbers cross referenced to 2Nxxxx, but where I can't recall.
Have you tried Google? Also ask on the boatanchor group. good luck 73 hank wd5jfr "Yrrah" wrote in message ... On a hot summer night the output of my 8640B suddenly disappeared. Later I learned that the output amp (marked 5086-7068) had failed. Any idea where to get a replacement? Apart from buying a second generator off course. Any help will be appreciated. regards, Harke PA0HRK |
Yrrah wrote:
On a hot summer night the output of my 8640B suddenly disappeared. Later I learned that the output amp (marked 5086-7068) had failed. Any idea where to get a replacement? Apart from buying a second generator off course. Any help will be appreciated. regards, Harke PA0HRK Looks like Agilent has a replacement part: Part Part Description Number Reference Used In Price Part Category 5086-7068 [Obsolete] ORD-08640-67002 Status : No Longer Orderable. Type : New support part for which Agilent owns the design specifications. Replaced By 08640-67002, which is no longer orderable. They'll exchange for a (? refurbished) part. I found this at http://www.parts.agilent.com/, after a little digging. If you _do_ do the exchange, please let us know how it turns out and what neighborhood the price was in. My 8640B will die one of these days, too. -- Mike Andrews Tired old sysadmin since 1964 |
Yrrah wrote:
On a hot summer night the output of my 8640B suddenly disappeared. Later I learned that the output amp (marked 5086-7068) had failed. Any idea where to get a replacement? Apart from buying a second generator off course. Any help will be appreciated. regards, Harke PA0HRK Looks like Agilent has a replacement part: Part Part Description Number Reference Used In Price Part Category 5086-7068 [Obsolete] ORD-08640-67002 Status : No Longer Orderable. Type : New support part for which Agilent owns the design specifications. Replaced By 08640-67002, which is no longer orderable. They'll exchange for a (? refurbished) part. I found this at http://www.parts.agilent.com/, after a little digging. If you _do_ do the exchange, please let us know how it turns out and what neighborhood the price was in. My 8640B will die one of these days, too. -- Mike Andrews Tired old sysadmin since 1964 |
The last time I asked Agilent for a replacement part (failed switching
supply) it cost more than the analyzer. We used a ginned up ATX supply with some DC-DC converters. "Mike Andrews" wrote in message ... Yrrah wrote: On a hot summer night the output of my 8640B suddenly disappeared. Later I learned that the output amp (marked 5086-7068) had failed. Any idea where to get a replacement? Apart from buying a second generator off course. Any help will be appreciated. regards, Harke PA0HRK Looks like Agilent has a replacement part: Part Part Description Number Reference Used In Price Part Category 5086-7068 [Obsolete] ORD-08640-67002 Status : No Longer Orderable. Type : New support part for which Agilent owns the design specifications. Replaced By 08640-67002, which is no longer orderable. They'll exchange for a (? refurbished) part. I found this at http://www.parts.agilent.com/, after a little digging. If you _do_ do the exchange, please let us know how it turns out and what neighborhood the price was in. My 8640B will die one of these days, too. -- Mike Andrews Tired old sysadmin since 1964 |
The last time I asked Agilent for a replacement part (failed switching
supply) it cost more than the analyzer. We used a ginned up ATX supply with some DC-DC converters. "Mike Andrews" wrote in message ... Yrrah wrote: On a hot summer night the output of my 8640B suddenly disappeared. Later I learned that the output amp (marked 5086-7068) had failed. Any idea where to get a replacement? Apart from buying a second generator off course. Any help will be appreciated. regards, Harke PA0HRK Looks like Agilent has a replacement part: Part Part Description Number Reference Used In Price Part Category 5086-7068 [Obsolete] ORD-08640-67002 Status : No Longer Orderable. Type : New support part for which Agilent owns the design specifications. Replaced By 08640-67002, which is no longer orderable. They'll exchange for a (? refurbished) part. I found this at http://www.parts.agilent.com/, after a little digging. If you _do_ do the exchange, please let us know how it turns out and what neighborhood the price was in. My 8640B will die one of these days, too. -- Mike Andrews Tired old sysadmin since 1964 |
Hi folks,
Many thanks for your comments. Indeed it is a kind of gold TO3 device. In the mean time I also found the "Sphere" junk shop. They sell an amplifier unit but it says: one of the gold devices fails, but not known which one. I think I know....Will try and search further. Thanks again, Harke Yrrah schreef in berichtnieuws ... |
Hi folks,
Many thanks for your comments. Indeed it is a kind of gold TO3 device. In the mean time I also found the "Sphere" junk shop. They sell an amplifier unit but it says: one of the gold devices fails, but not known which one. I think I know....Will try and search further. Thanks again, Harke Yrrah schreef in berichtnieuws ... |
Harke,
I had the same thing happen to an 8640a. The failure was the output gold IC. I found one for about $150 bucks. The failure happened when I had some low voltage ac get back into the output, and I happened to have the attenuator in the max out (no attenuation) setting. As a note to anyone who has an 8640a or b, there is a reverse power option that might save the power amp. I found the best preventative is to use a 20db external N connector pad connected right at the output. Just divide the output voltage level by 10 (20 db). eg, if you have .75 volt output, you actually have .075 volt output from the 20 db pad. Jack |
Harke,
I had the same thing happen to an 8640a. The failure was the output gold IC. I found one for about $150 bucks. The failure happened when I had some low voltage ac get back into the output, and I happened to have the attenuator in the max out (no attenuation) setting. As a note to anyone who has an 8640a or b, there is a reverse power option that might save the power amp. I found the best preventative is to use a 20db external N connector pad connected right at the output. Just divide the output voltage level by 10 (20 db). eg, if you have .75 volt output, you actually have .075 volt output from the 20 db pad. Jack |
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