Author Topic: HP 8591e with very dim crt... worth buying?  (Read 3450 times)

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Offline xwarpTopic starter

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HP 8591e with very dim crt... worth buying?
« on: May 26, 2017, 11:51:51 pm »
Local sale for $250. It needs a new crt, which I see can be had for $200. Checked it out and it appears that it should be fine once a new crt is put in.

Being 75ohm, that is ok by me.

Thoughts?
 

Offline james_s

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Re: HP 8591e with very dim crt... worth buying?
« Reply #1 on: May 28, 2017, 02:05:19 am »
I'd jump on that if it were local to me. Might be able to revive the CRT, I've had reasonable luck with my Sencore CRT tester rejuvenating old tubes. Doesn't always work but it's worth a shot.
 

Offline xwarpTopic starter

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Re: HP 8591e with very dim crt... worth buying?
« Reply #2 on: May 28, 2017, 03:17:39 am »
Turns out that the intensity pot knob was the issue although the crt does have significant burn in, it's still bright and clear.
 

Offline james_s

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Re: HP 8591e with very dim crt... worth buying?
« Reply #3 on: May 28, 2017, 05:04:51 am »
I love an easy fix like that. Sounds like you got a heck of a deal, some burn is pretty common, it could easily last thousands of hours more.
 

Offline deepskyridge

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Re: HP 8591e with very dim crt... worth buying?
« Reply #4 on: May 28, 2017, 02:20:55 pm »
I bought one a while back with a dead display. I used the video output on the back to verify operation.

I got a new (NOS) from the following seller:

http://www.ebay.com/itm/1-Qty-LOT-NEW-HP-Agilent-2090-0539-CRT-Display-Section-for-8590-Spectrum-Analyze-/262968678639?hash=item3d3a2798ef:g:oEYAAOSw~FNUY7~q

Easy fix, unit works great. Don't forget to change the battery in the unit.

Gary
 

Offline NavyBOFH

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Re: HP 8591e with very dim crt... worth buying?
« Reply #5 on: May 28, 2017, 04:25:22 pm »
As the above poster said - the CRT kits are pretty cheap and are all new or "good stock". I have plenty of 856x series analyzers with good screens but other blown components we use as spare parts cadavers for our working units.

That being said - I also hear the LCD upgrade kits are worth every penny if you want to spend around $500 on a display. I am just waiting for a CRT to die on a piece of equipment to give me a reason to try and order one.
 

Offline carl_lab

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Re: HP 8591e with very dim crt... worth buying?
« Reply #6 on: May 28, 2017, 05:38:19 pm »
Don't forget to change the battery in the unit.
Where is the battery located?
I repaired our 8591E a few weeks ago, but I couldn't find the battery.
 

Offline xwarpTopic starter

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Re: HP 8591e with very dim crt... worth buying?
« Reply #7 on: May 28, 2017, 06:04:30 pm »
Don't forget to change the battery in the unit.
Where is the battery located?
I repaired our 8591E a few weeks ago, but I couldn't find the battery.

The manual I have states that it's on the A16A1 memory board.
 
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Online MarkL

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Re: HP 8591e with very dim crt... worth buying?
« Reply #8 on: May 28, 2017, 08:18:51 pm »
There's a procedure in the 895x service manual to backup the cal contstants.  You might want to do this before replacing the battery, just in case something slips.

Depending on the age of the unit, it could be either a cylindrical lithium cell on the main board on the bottom near the back, or a large lithium coin cell on the memory card.
 
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Offline carl_lab

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Re: HP 8591e with very dim crt... worth buying?
« Reply #9 on: May 28, 2017, 09:20:37 pm »
There's a procedure in the 895x service manual to backup the cal contstants.  You might want to do this before replacing the battery, just in case something slips.

Good point.
AFAIK a new calibration is not exactly what I'd call low-cost...
« Last Edit: May 28, 2017, 09:22:27 pm by carl_lab »
 


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