Re: HP 8670B amplifier - does it ring a bell with anyone?
Am 23.02.2025 um 08:51 schrieb DF6NA Rainer:
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HP 83020A 2-26,5GHz - 30dB gain - 30dBm out
Am 22.02.2025 um 23:54 schrieb David Feldman via groups.io:
Hi All,
Today (22 Feb) had access to the HP 8670B unit that started this conversation. I've attached three internal photos with close-up of any identifying information I could see.
Did some RF testing at 2, 6, 10, 14 and 18 GHz. It appears to have 30-40 dB of gain and 1-3 watts output power. As the test set-up was not particularly friendly (an ancient Wiltron sweeper and Narda 7000A operating in power meter mode that was about +/- 1 dB off HP 8484A), once the (much) higher than expected max output power was observed, we switched to a Narda 30 dB high power attenuator (intended only to 6 GHz), after a cursory check indicated that it just got lossier as it was operated well above it's specification.
Anyway, there was no indication of how the internal potentiometers would need to be adjusted, nor how the unit uses those, but at least for now at? 6 GHz it seems to be usable.
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Re: HP 8670B amplifier - does it ring a bell with anyone?
HP 83020A 2-26,5GHz - 30dB gain - 30dBm out
Am 22.02.2025 um 23:54 schrieb David Feldman via groups.io:
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Hi All,
Today (22 Feb) had access to the HP 8670B unit that started this conversation. I've attached three internal photos with close-up of any identifying information I could see.
Did some RF testing at 2, 6, 10, 14 and 18 GHz. It appears to have 30-40 dB of gain and 1-3 watts output power. As the test set-up was not particularly friendly (an ancient Wiltron sweeper and Narda 7000A operating in power meter mode that was about +/- 1 dB off HP 8484A), once the (much) higher than expected max output power was observed, we switched to a Narda 30 dB high power attenuator (intended only to 6 GHz), after a cursory check indicated that it just got lossier as it was operated well above it's specification.
Anyway, there was no indication of how the internal potentiometers would need to be adjusted, nor how the unit uses those, but at least for now at 6 GHz it seems to be usable.
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Re: Vintage parts for sale
Thank you for not replying. ?
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From: [email protected] On Behalf Of NICK K. PLUMIDAKIS via groups.io Sent: Friday, February 21, 2025 6:05 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] Vintage parts for sale? -------- Original message -------- Date: 2/21/25 17:52 (GMT+02:00) Subject: Re: [HP-Agilent-Keysight-equipment] Vintage parts for sale Hey, here is the link to pictures of parts.,
Let me know what you need. I prefer to sell all of them.
Best Jurek
?On 21/02/2025, 16:49, "Alexander Huemer via groups.io" <[email protected] <mailto:[email protected]> on behalf of aziD5eeth9fe@... <mailto:[email protected]>> wrote:
Hi!
On Fri, Feb 21, 2025 at 12:51:21PM +0100, jerzy przezdziecki via groups.io wrote: > I am closing down my father’s long-standing workshop, which > specialized in tube and radio technology using components available in > the 1970s and 1980s. There are hundreds of germanium diodes, > transistors, ceramic tubular capacitors, styroflex capacitors and > power resistors—both new and desoldered. There’s a large quantity of > these components. If anyone is interested, I can send photos and a > detailed description.
Some pictures and a list of items would be appreciated. I personally could imagine to want a 'grab bag' of a small quantity of the individual items. You know, 'just in case'.
-Alex
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Re: HP 8670B amplifier - does it ring a bell with anyone?
Now look up HP83020A and see if there's any info.
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Ed
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Re: HP 8670B amplifier - does it ring a bell with anyone?
Hi All,
Today (22 Feb) had access to the HP 8670B unit that started this conversation. I've attached three internal photos with close-up of any identifying information I could see.
Did some RF testing at 2, 6, 10, 14 and 18 GHz. It appears to have 30-40 dB of gain and 1-3 watts output power. As the test set-up was not particularly friendly (an ancient Wiltron sweeper and Narda 7000A operating in power meter mode that was about +/- 1 dB off HP 8484A), once the (much) higher than expected max output power was observed, we switched to a Narda 30 dB high power attenuator (intended only to 6 GHz), after a cursory check indicated that it just got lossier as it was operated well above it's specification.
Anyway, there was no indication of how the internal potentiometers would need to be adjusted, nor how the unit uses those, but at least for now at 6 GHz it seems to be usable.
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Re: 8596E Spectrum Analyzer Fault
Not sure about 'autocouple' but the actual range seems to be irrelevant. I've tried several. It's the instant the 'stop' frequency is entered that brings on the fault, whether that be by keypad or datum knob.
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Re: HP141T solid state replacement for the neon reference.
Guys, ? I have built 4 more of the BE19400013B neon replacement boards and I am about to relist them on Ebay. ? Mike ?
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From: [email protected] <[email protected]> On Behalf Of Michael Bafaro via groups.io Sent: Saturday, February 22, 2025 10:05 AM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP141T solid state replacement for the neon reference.? Guys, ? The 4 units of the BE19400013B have been sold.? I have started building 4 more and when they are built and tested I will relist it on Ebay. ? Mike Bafaro ? ? Guys, ? I have just built and tested 4 more units of the neon tube replacement for the 141T (BE19400013B), and they are listed on Ebay.?? If you wish to buy directly from me, I can be reached at m.bafaro@....? It is listed as item # 306099745539 on Ebay. ? Best wishes, Mike Bafaro WA9ZEO
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Re: 8596E Spectrum Analyzer Fault
Response to commands is usually postponed until the end of the current sweep. If the synth is having trouble locking, or the sweep is slow due to narrowband, or perhaps crossing band edges, command response will be affected. Try adjusting start / stop / span to see if there is a particular range that is slowing things down. And set autocouple to all...
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Re: HP 5245L counting/gate problems
I've seen a few open circuit failures of the 1500uF 15V capacitor in at least 2 of the counters from this series and some HP analog multimeters, other than that the others have been OK, a few of the small ones have been a bit tired.
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For gate light faults, I rebuilt a stripped 5245L using a pile of boards from varoius sources and made some to replace those I couldn't obtain, the pile of boards had quite a lot of faults, the gate light was stuck on with the board I had, a lot of the 2N708/709 transistors on one board were either open or shorted, makes you wonder what happened to it to cause that much damage.?
There is a thread here on the rebuild; https://www.vintage-radio.net/forum/showthread.php?t=205651
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David
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Re: HP141T solid state replacement for the neon reference.
Guys, ? The 4 units of the BE19400013B have been sold.? I have started building 4 more and when they are built and tested I will relist it on Ebay. ? Mike Bafaro ?
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From: [email protected] <[email protected]> On Behalf Of Michael Bafaro via groups.io Sent: Saturday, February 8, 2025 11:45 AM To: [email protected] Subject: [HP-Agilent-Keysight-equipment] HP141T solid state replacement for the neon reference.? Guys, ? I have just built and tested 4 more units of the neon tube replacement for the 141T (BE19400013B), and they are listed on Ebay.?? If you wish to buy directly from me, I can be reached at m.bafaro@....? It is listed as item # 306099745539 on Ebay. ? Best wishes, Mike Bafaro WA9ZEO
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Re: HP 5245L counting/gate problems
You can use the old vintage cans and put a newer, low ESR capacitors inside to keep the vintage look. Just make a simple pcb to solder the new cap inside and keep the old pins outside. ? Jurek ? OK Scott, it has never been recapped as far as I know. I’ll look into how/where the supply voltages are tested and will probably just go ahead and recap to avoid any future supply problems.
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Re: HP 5245L counting/gate problems
OK Scott, it has never been recapped as far as I know. I’ll look into how/where the supply voltages are tested and will probably just go ahead and recap to avoid any future supply problems.
Thanks,
Tom N5AMA
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Re: HP 5245L counting/gate problems
Hi Pete,
Thanks for the reply. The neon bulb is working on the start and stop test function. When placed on the start position, the bulb comes on but the counter doesn’t display any counting. All the Nixie tubes are working because when the counter is first turned on there is a number displayed that goes away when the counter is reset.
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There appears to be two problems on that counter. One is it’s not counting and the other is the gate isn’t working.
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The second counter appears to have only one problem. It counts when placed on manual test start and stops counting when placed on stop. When this 5245L is placed in the frequency position, it doesn’t show any gate or frequency response on the display. I’m assuming there is only a gate failure here.
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Thanks,
Tom n5ama
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Re: HP 5245L counting/gate problems
I just resurrected one.
If the power supply hasn't been re-capped, check the supply voltages first.? In my case every d*** capacitor was bad.? Check back then.
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Re: HP 5245L counting/gate problems
Just an idea: In the case of the gate indicator (a neon bulb): try shining a bright light on it to see if that "fixes" it.
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As for "not counting", I don't know an alternative other than to probe signals to find out where things are failing. Is there a gate signal?
I don't remember if the lowest digit display module is unique, or if it's the same as the 2nd digit. If they're the same, try swapping them with each other.
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Pete
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Re: HP 3403C True RMS Voltmeter display fault
There are days when Murphy's Law just seems to run in overdrive mode, but the fun will resume in a few day and I hope to have more news soon !
Joel
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Re: HP 3403C True RMS Voltmeter display fault
Well, It did not go well lol.
This is actually not that badly packed. It is somewhat dense but this is really well designed. The boards can be freed from their metal case easily, and A22 (AD board) is socketed from the rest, and the LDs themselves are socketed too. Really easy to work on actually. Nothing to complain about, great job from the good fellas at HP. Expect I wanted to reseat the chips in case of moisture but my hand slipped when doing LD110 and it badly bent a pin which broke on straightening. Meh. I guess the replacement is mandatory now. I have ordered the pair. I'll still take some measurements later but there it goes. At least the chips are easy to find on Ebay, and wasn't even crazy expensive nor far away.
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HP 5245L counting/gate problems
I have several of the HP 5245L counters and until recently, had at least one working. Now it seems that the last “working” counter I own has gone belly up.
Two of them have the same problem, (the gate indicator isn’t flashing and one of the two isn't counting). I have the manual and it gives some trouble shooting points to check but in some cases, it only states there is a problem with a board instead of providing a list of components that could be faulty.
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This appears to be a common problem, at least with two of mine. It may be common enough for one of you experts to have fixed it and remembers what component failed. If so, I would greatly appreciate some help.
?
Tom. N5AMA
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Thank you for that detail!?
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On Fri, Feb 21, 2025 at 7:32?PM Peter Gottlieb via <hpnpilot= [email protected]> wrote:
Indeed, but with a 1000:1 probe that becomes a +/- 2000 volt
input range which is sufficient.
That was a work requirement and their solution covers more,
although this would be sufficient for them too.
Peter
On 2/21/2025 10:25 PM, Jeremy Nichols
via wrote:
Peter, didn’t you have some high-voltage
requirements for your application? Looks like the 54003A is
limited to +/- 2 Volts, after whatever reduction the probe
provides. (Just curious. I missed the last couple of days of
discussion.)?
On Fri, Feb 21, 2025 at
7:07?PM Peter Gottlieb via <hpnpilot= [email protected]>
wrote:
Thank
to those who provided information I was able to successfully
use
54003A input modules as 1 meg probe converter/extenders.
For my company the current COTS device was used to allow
remotely using
scope probes (like the Tek HP probes) at a distance from the
test
equipment, which also happened to have 50 ohm inputs.
However I also
wanted this capability in my home lab and didn't want to
spend a lot of
money.
The 54003A modules are available very inexpensively.? With a
small +/-
10 volt supply and soldering on a 50 ohm coax cable these
modules will
very nicely allow high impedance measurements with 50 ohm
instruments
like spectrum analyzers, up to 300 MHz or so.
These can be had for under $30 shipped from the auction
site.
IMHO a very useful device to have hanging around the lab.
Especially for
the money.
Peter
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Indeed, but with a 1000:1 probe that becomes a +/- 2000 volt
input range which is sufficient.
That was a work requirement and their solution covers more,
although this would be sufficient for them too.
Peter
On 2/21/2025 10:25 PM, Jeremy Nichols
via groups.io wrote:
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Show quoted text
Peter, didn’t you have some high-voltage
requirements for your application? Looks like the 54003A is
limited to +/- 2 Volts, after whatever reduction the probe
provides. (Just curious. I missed the last couple of days of
discussion.)?
On Fri, Feb 21, 2025 at
7:07?PM Peter Gottlieb via <hpnpilot= [email protected]>
wrote:
Thank
to those who provided information I was able to successfully
use
54003A input modules as 1 meg probe converter/extenders.
For my company the current COTS device was used to allow
remotely using
scope probes (like the Tek HP probes) at a distance from the
test
equipment, which also happened to have 50 ohm inputs.
However I also
wanted this capability in my home lab and didn't want to
spend a lot of
money.
The 54003A modules are available very inexpensively.? With a
small +/-
10 volt supply and soldering on a 50 ohm coax cable these
modules will
very nicely allow high impedance measurements with 50 ohm
instruments
like spectrum analyzers, up to 300 MHz or so.
These can be had for under $30 shipped from the auction
site.
IMHO a very useful device to have hanging around the lab.
Especially for
the money.
Peter
|