Date   
Re: OT (sorry)

ArtekManuals
 

According to the manual(s)  ( I have no personal experience working on this unit)  E52 error is most likely U401 Shaper IC is unable to supply negative output . U401 is listed as a custom HP IC IDC7 hp part number 1826-0923. U401 is further implicated if you are not getting Error E51. The block diagram of U401 would seem to point to the IC itself ( very busy little boy inside).  Could be the -15V rail too I suppose but I would expect other errors as well if that is off ??

As one poster noted better to take this over to the HP_Agilent_Group to find a real expert

_DC
manuals@...

On 3/12/2018 10:15 PM, lop pol via Groups.Io wrote:
Im looking on evil bay at a hp8116A function generator. The one I'm looking at is displaying an e52. I have looked all over for error codes and am not able to find anything. The manual from agilent tells me to look at section 10 but the manual ends at 9-27. I was hoping someone here has that function generator and the manual?


--
Dave
Manuals@...
www.ArtekManuals.com

Re: OT (sorry)

 

There are a couple on ebay for less and that seem to be working. This unit has a few hard to find IC's that might be the issue with the one with the self test error. I would stay away myself unless he would take $50 or less. But that is me.


Regards

-----Original Message-----
From: lop pol via Groups.Io <the_infinite_penguin=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 11:58 pm
Subject: Re: [TekScopes] OT (sorry)

The seller wants $175 I don't know if its worth the risk.

Re: OT (sorry)

Brendan
 

The seller wants $175 I don't know if its worth the risk.

Re: OT (sorry)

 

I have one.

1) get yourself a good copy of the service manual from Artekmanuals.com

http://artekmanuals.com/manuals/hp-manuals/

2) Check all power supply rails for level and ripple.

3) There is a memory battery - check it and change it.

4) The error e-52 is Shaper IC 401 not able to supply negative output when...
see service blocks 5,6,7.

This may be a power supply issue if you are lucky.


HTH,
Tom

-----Original Message-----
From: lop pol via Groups.Io <the_infinite_penguin=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 10:15 pm
Subject: [TekScopes] OT (sorry)

Im looking on evil bay at a hp8116A function generator. The one I'm looking at is displaying an e52. I have looked all over for error codes and am not able to find anything. The manual from agilent tells me to look at section 10 but the manual ends at 9-27. I was hoping someone here has that function generator and the manual?

OT (sorry)

Brendan
 

Im looking on evil bay at a hp8116A function generator. The one I'm looking at is displaying an e52. I have looked all over for error codes and am not able to find anything. The manual from agilent tells me to look at section 10 but the manual ends at 9-27. I was hoping someone here has that function generator and the manual?

Re: Question On 7000 Type Units

 

Jeff,
It the high voltage increases, the beam will get harder to deflect.Thus, the displayed waveform will get smaller.
HankC, Boston, WA1HOS

Re: Tektronix 2465 capacitors etc. - Going deeper!

k1ggi
 

Yes, that is good to know.

As I was reading this thread about the need for a non-polar cap, my
curiosity was piqued, so I googled "2465 service manual" and hastily took
the first hit, which was from tek.com itself.

https://www.tek.com/manual/2465a-and-2467-service-manual

My remarks were based on that 2465a manual, and I'm glad that some saw
through the mist and understood the point anyway.

Ed, k1ggi

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
tmillermdems
Sent: Monday, March 12, 2018 2:40 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

Ok, that is good to know. We were talking about the 2465, not the A or B
versions.


Regards





-----Original Message-----
From: machineguy59 via Groups.Io <machineguy59=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 1:38 pm
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

Not on my schematic.
I checked three schematics, a 2465, a 2465A and a 2465B. Only the 2465A had
the capacitor incorrectly inverted, with the negative pole connected to the
junction of CR1131 and CR1132. The 2465 and 2465B schematics had it
correct, with the POSITIVE pole of C1130 connected to the junction of cR1131
and cR1132. I am guessing the PCB layout has it correct since we haven't
had a rash of failing C1030s.

But the schematic has C1130 drawn inverted.
Not sure what you mean here.


It was just a comment copied from the original message.

Re: Question On 7000 Type Units

 

Hi Jeff,

Is the size changing on just one axis or on both axes simultaneously? If it is just one axis it may be a noisy pot in the vertical or horizontal output gain circuit. If it is both axes simultaneously it is most likely the HV supply section.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jeff Urban
Sent: Sunday, March 11, 2018 2:59 PM
To: TekScopes@groups.io
Subject: [TekScopes] Question On 7000 Type Units

Got a 7834 and a 7603 with the CRT display size changing intermittently. Since it is intermittent and I can't cause it or stop it beating or heating, I guess I need to let it (them) run and monitor something.

I am in doubt what to monitor. I think they both have a big bleeder/feedback resistor for HV regulation. Monitoring the output of that will tell me if the fault is in the HV regulator but NOT the resistor itself. I would have to find another point to measure, possibly rectify off the transistor feeding the transformer and see if that voltage changes with all else equal. Lowering HV would cause higher deflection sensitivity.

The other possibility is the power supply. If the HV regulator is working properly, it seems a rise in supply voltages would result in a larger display.

So, since you guys probably have more experience than I on these things, do you think I should hit the power supply first or the HV regulation ?

If it turns out to be the BDR (Big Damn Resistor) I bet it is unobtaimium. I think I can figure out another way to supply feedback. No doubt it would not be good as new, but it would be much better than it is now. The way they are now sometimes the readouts are off the screen, I know I can make it tighter than that by hook or by crook.

I think there is still a pretty raped 7613 for parts, but since it is a storage scope the CRT is different so I am not banking on the associated parts being compatible. Or maybe with the 7834 only, not sure right now. That one also has a problem with storage, but in due time, I want to fix this problem first.

Just would like some advice before I get started. These scopes actually belong to my cohort in electronics. I would likely set this up and he can watch it as it runs. just trying to save time and lugging me or the scopes around repeatedly, none of us are all that light... :-)

Thanks in advance.





--
Dennis Tillman W7PF
TekScopes Moderator

Re: Tektronix 2465 capacitors etc. - Going deeper!

 

Ed

Firstly, thank you for that clarification, that the voltage across C1130 does NOT alternate.

Secondly, (unlike a posting in Yahoo groups) in these postings, we CAN go back and edit our text, if necessary.
Under the posting, there is a "More" option, with an "Edit" sub- option.

Menahem

Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?

 

The 2445B is on its way. Its not working but I don't expect much trouble fixing that. I have a 2465 parts mule so repairs should go quickly. Then its all about putting the 2465B A1 board in the 2445B frame. I will post here for help and give progress reports as I go. My first question has to do with the attenuators. The 2465B A1 board does not have attenuators installed. Can I use attenuators from the 2465 parts mule? Or do I need attenuators unique to the 2465B?

Re: 7603 Readout Diagnosing Help Please

Fabio Trevisan
 

Hello DC902,
I don't know if the horizontal compression is still happening or if it comes and goes, if it is, try to set a slower sweep speed and find out if the sweep is running backwards,
If it's running backwards, then you're probably looking at the exact same problem as I just had with my 7623A.
See the threads:
Tek 7623A - Inverted and compressed Horizontal only from TB (was 7623A + 7A26 + 7B53)
https://groups.io/g/TekScopes/message/145359

Tek 7623A - Inverted and compressed Horizontal only from TB (SOLVED)
https://groups.io/g/TekScopes/message/145419

While it may sound good for you that someone else (me) would have had the same problem and possibly the solution, as you will see looking at the first message of thread #145359 above, the problem disappeared while I was troubleshooting, checking and re-seating the Hor. Signal cable, between the Interface board and the Hor. Amp. board.
Most likely explanation was that one of the sides had a false contact (maybe caused by thickened contact lubricant).

I don't have a problem with my readout, but I would like to rephrase / resubmit the question of Roger... When you press Identify... Are you getting 8 small vertical lines (one for each character) in place where the readout should be displaying the word? or are you getting one vertical line for each the whole word identify?

Re: Tektronix 2465 capacitors etc. - Going deeper!

 

Ok, that is good to know. We were talking about the 2465, not the A or B versions.


Regards

-----Original Message-----
From: machineguy59 via Groups.Io <machineguy59=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 1:38 pm
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

Not on my schematic.
I checked three schematics, a 2465, a 2465A and a 2465B. Only the 2465A had the capacitor incorrectly inverted, with the negative pole connected to the junction of CR1131 and CR1132. The 2465 and 2465B schematics had it correct, with the POSITIVE pole of C1130 connected to the junction of cR1131 and cR1132. I am guessing the PCB layout has it correct since we haven't had a rash of failing C1030s.

But the schematic has C1130 drawn inverted.
Not sure what you mean here.


It was just a comment copied from the original message.

Re: Tek 7623A - Inverted and compressed Horizontal only from TB (SOLVED)

Fabio Trevisan
 

Thanks Jeff,
thanks for the heads up...
Well. I concur with you in that a problem which got solved by itself is a
problem ready to happen again and, moreover, while I exhausted all possible
explanations and having find none, I`m forced to let it be and, if the
problem ever recurs, I`ll have a chance to investigate more carefully (not
touching anything and just probing around) and eventually find the real
culprit.
I have been working on other details of the scope the whole weekend, and
not a single time this problem happened again, between many, many power
cycles and removal and insertion of plug-ins...
It remains a mystery.
Good look with the 561... Tube stuff is completely out of my comfort zone.
rgrds,
Fabio


2018-03-09 13:58 GMT-03:00 Jeff Urban <@JURB>:

Actually I don't like it when it happens. It could recur at any time.

if it does I would look to the mode selection, which is what switches the
IC's gain and who knows what else for the on screen display. While it
doesn't seem logical the sweep would be compressed if it was stuck in that
mode, the input could have been out of range.

I could be off base here, this is my first post and I have to admit to not
reading the whole thread.

But I got my feet wet. Soon I will be ready to start a thread maybe the
old timers might like - a 561. Has troubles in the vertical section after
an arcing transformer threw the DC from the negative bias into the
vertical. I have much information to put together so it probably won't be
today. Honestly, some of it will come from my posts on Usenet.

Be well all. See ya.



Re: Tektronix 2465 capacitors etc. - Going deeper!

 

Nevermind. Can't post pictures.

-----Original Message-----
From: tmillermdems <tmiller11147@...>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 2:11 pm
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!


Here is what my schematic shows.






-----Original Message-----
From: tmillermdems <tmiller11147@...>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 1:10 pm
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

Not on my schematic. It is shown correctly with the positive pole connected to the junction of CR1131 and CR1132. It will have about 40 volts across it and of the correct polarity. Pay attention to the diodes and re-analyze the circuit.














But the schematic has C1130 drawn inverted.







-----Original Message-----
From: machineguy59 via Groups.Io <machineguy59=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 1:00 pm
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

Ed,

You are correct!! C1130 never sees a negative charge so a polarized capacitor capable of high ripple currents (low ESR) will work best. Non-polarized electrolytics have double the ESR of their polarized brethren. So a Voltage double should always use polarized capacitors. But the schematic has C1130 drawn inverted. I plan to refurb a 2465 series PSU in the next week or so and I will check the PCB markings to see if they have the same mistake. The wrong polarity on the schematic for C1130 is not the only error in the Tek documentation for the PSU. The PCB layout has C1115 and C1132 interchanged so many technicians following the PCB layout put a 25 Volt rated capacitor (C1115) in a 90 volt position (C1132).

I personally, would never use a 450 rated capacitor in a 100 volt circuit. My rule of thumb is nothing more than double the rated voltage. But I often violate that rule when working with low voltage circuits (say 15 Volts or less). The reason is low ESR over the lifetime of the capacitor. A high voltage electrolytic starts out with a higher ESR (because the plates are further apart and I believe the electrolyte is less conductive). Worse, a high voltage electrolytic capacitors ESR will rise and its capacitance fall if it is not properly energized. But, realistically, most of these scopes are not likely to be used more than another ten years before being refurbed for other reasons.

Re: Tektronix 2465 capacitors etc. - Going deeper!

 

Here is what my schematic shows.

-----Original Message-----
From: tmillermdems <tmiller11147@...>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 1:10 pm
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

Not on my schematic. It is shown correctly with the positive pole connected to the junction of CR1131 and CR1132. It will have about 40 volts across it and of the correct polarity. Pay attention to the diodes and re-analyze the circuit.














But the schematic has C1130 drawn inverted.







-----Original Message-----
From: machineguy59 via Groups.Io <machineguy59=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 1:00 pm
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

Ed,

You are correct!! C1130 never sees a negative charge so a polarized capacitor capable of high ripple currents (low ESR) will work best. Non-polarized electrolytics have double the ESR of their polarized brethren. So a Voltage double should always use polarized capacitors. But the schematic has C1130 drawn inverted. I plan to refurb a 2465 series PSU in the next week or so and I will check the PCB markings to see if they have the same mistake. The wrong polarity on the schematic for C1130 is not the only error in the Tek documentation for the PSU. The PCB layout has C1115 and C1132 interchanged so many technicians following the PCB layout put a 25 Volt rated capacitor (C1115) in a 90 volt position (C1132).

I personally, would never use a 450 rated capacitor in a 100 volt circuit. My rule of thumb is nothing more than double the rated voltage. But I often violate that rule when working with low voltage circuits (say 15 Volts or less). The reason is low ESR over the lifetime of the capacitor. A high voltage electrolytic starts out with a higher ESR (because the plates are further apart and I believe the electrolyte is less conductive). Worse, a high voltage electrolytic capacitors ESR will rise and its capacitance fall if it is not properly energized. But, realistically, most of these scopes are not likely to be used more than another ten years before being refurbed for other reasons.

Re: Tektronix 2465 capacitors etc. - Going deeper!

 

Not on my schematic.
I checked three schematics, a 2465, a 2465A and a 2465B. Only the 2465A had the capacitor incorrectly inverted, with the negative pole connected to the junction of CR1131 and CR1132. The 2465 and 2465B schematics had it correct, with the POSITIVE pole of C1130 connected to the junction of cR1131 and cR1132. I am guessing the PCB layout has it correct since we haven't had a rash of failing C1030s.

But the schematic has C1130 drawn inverted.
Not sure what you mean here.

Re: Tektronix 2465 capacitors etc. - Going deeper!

 

Not on my schematic. It is shown correctly with the positive pole connected to the junction of CR1131 and CR1132. It will have about 40 volts across it and of the correct polarity. Pay attention to the diodes and re-analyze the circuit.




But the schematic has C1130 drawn inverted.

-----Original Message-----
From: machineguy59 via Groups.Io <machineguy59=yahoo.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Mon, Mar 12, 2018 1:00 pm
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

Ed,

You are correct!! C1130 never sees a negative charge so a polarized capacitor capable of high ripple currents (low ESR) will work best. Non-polarized electrolytics have double the ESR of their polarized brethren. So a Voltage double should always use polarized capacitors. But the schematic has C1130 drawn inverted. I plan to refurb a 2465 series PSU in the next week or so and I will check the PCB markings to see if they have the same mistake. The wrong polarity on the schematic for C1130 is not the only error in the Tek documentation for the PSU. The PCB layout has C1115 and C1132 interchanged so many technicians following the PCB layout put a 25 Volt rated capacitor (C1115) in a 90 volt position (C1132).

I personally, would never use a 450 rated capacitor in a 100 volt circuit. My rule of thumb is nothing more than double the rated voltage. But I often violate that rule when working with low voltage circuits (say 15 Volts or less). The reason is low ESR over the lifetime of the capacitor. A high voltage electrolytic starts out with a higher ESR (because the plates are further apart and I believe the electrolyte is less conductive). Worse, a high voltage electrolytic capacitors ESR will rise and its capacitance fall if it is not properly energized. But, realistically, most of these scopes are not likely to be used more than another ten years before being refurbed for other reasons.

Re: Tektronix 2465 capacitors etc. - Going deeper!

 

Ed,

You are correct!! C1130 never sees a negative charge so a polarized capacitor capable of high ripple currents (low ESR) will work best. Non-polarized electrolytics have double the ESR of their polarized brethren. So a Voltage double should always use polarized capacitors. But the schematic has C1130 drawn inverted. I plan to refurb a 2465 series PSU in the next week or so and I will check the PCB markings to see if they have the same mistake. The wrong polarity on the schematic for C1130 is not the only error in the Tek documentation for the PSU. The PCB layout has C1115 and C1132 interchanged so many technicians following the PCB layout put a 25 Volt rated capacitor (C1115) in a 90 volt position (C1132).

I personally, would never use a 450 rated capacitor in a 100 volt circuit. My rule of thumb is nothing more than double the rated voltage. But I often violate that rule when working with low voltage circuits (say 15 Volts or less). The reason is low ESR over the lifetime of the capacitor. A high voltage electrolytic starts out with a higher ESR (because the plates are further apart and I believe the electrolyte is less conductive). Worse, a high voltage electrolytic capacitors ESR will rise and its capacitance fall if it is not properly energized. But, realistically, most of these scopes are not likely to be used more than another ten years before being refurbed for other reasons.

Re: Tektronix 2465 capacitors etc. - Going deeper!

k1ggi
 

Oh dear,
The voltage across C1130 does NOT alternate (does not change polarity).
Ed

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of k1ggi
Sent: Monday, March 12, 2018 11:11 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

I'm surprised that some of the regulars haven't weighed in on this.

Much of this discussion seems to have started based on a false premise.

The voltage across C1130 does alternate (does not change polarity).

C1130 is in a half-wave voltage doubler and runs with somewhere between 40
to 50Vdc across it, unipolar.

The curved plate is always positive with respect to the flat plate. It would
have been better if the draftsman had flipped the symbol the other way.

On the half-cycle when T0160 pin 2 is positive with respect to pin 1, the
curved plate of C1130 gets positive charge from the transformer through
CR1123 and CR1131.

On the half-cycle when T0160 pin 1 is positive with respect pin 2, the flat
plate of C1130 gets elevated by the positive transformer voltage appearing
on pin 1, with pin 2 at near ground through CR1121. Thus the voltage at the
curved plate becomes nearly twice the transformer peak voltage above ground.
At this point, in series with the transformer, C1130 delivers some of its
charge to C1132 via current through CR1132 and CR1121. This replenishes the
charge drawn from C1132 by the load current during the cycle. As the charge
transfers, the voltage has to drop somewhat, because C*deltaV=I*deltaT,
where T is the period. As the dropping voltage at the curved plate equalizes
with the rising voltage on C1132, the drain on C1130 thru CR1132 stops.
Nothing drains C1130 completely or reverses its charge. So C1130 has some
ripple on top of dc, as is expected of all reservoir caps in a power supply.


The ~50V across C1130, in series with the ~50V out of the transformer, adds
up to make the doubled voltage, cycle after cycle.

From the parts list, C1130 and C1120 are 10uF/100V electrolytics run at
about 50V. C1132 is 10uF/160V run at about 100V. Good engineering.

C1130 should have been drawn with the flat plate to the right, and with a +
sign. I would hope the silkscreen on the board is marked appropriately, but
I don't have a 2465 to check.

Ed, k1ggi

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of woody
wilson
Sent: Monday, March 12, 2018 4:43 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

There is an alternating voltage across the capacitor and a corresponding
alternating current that is passing through the capacitor. You may find that
some high voltage capacitors actually have a lower esr than low voltage
capacitors, the electrolyte has a direct correlation in regards to the
dissipation factor of the capacitor. I will explain, the higher the voltage
the capacitor, the greater the electrode spacing and depending on the type
of electrolyte the high voltage capacitor needs a greater electrode area for
the same capacitance as lower voltage capacitor, thus high voltage
capacitors do have lower esr.
At the end of the day, a capacitor was open circuit more or less, 1.8nf
measured on a 10uf device pretty well tells me it is dead. I will recap this
2465 with a variety of 450wv and 100wv caps and C1130 will get two 25uf
capacitors connected in series with their positives connected together to
make a long lasting non polarised capacitor.

Re: Tektronix 2465 capacitors etc. - Going deeper!

k1ggi
 

I'm surprised that some of the regulars haven't weighed in on this.

Much of this discussion seems to have started based on a false premise.

The voltage across C1130 does alternate (does not change polarity).

C1130 is in a half-wave voltage doubler and runs with somewhere between 40
to 50Vdc across it, unipolar.

The curved plate is always positive with respect to the flat plate. It would
have been better if the draftsman had flipped the symbol the other way.

On the half-cycle when T0160 pin 2 is positive with respect to pin 1, the
curved plate of C1130 gets positive charge from the transformer through
CR1123 and CR1131.

On the half-cycle when T0160 pin 1 is positive with respect pin 2, the flat
plate of C1130 gets elevated by the positive transformer voltage appearing
on pin 1, with pin 2 at near ground through CR1121. Thus the voltage at the
curved plate becomes nearly twice the transformer peak voltage above ground.
At this point, in series with the transformer, C1130 delivers some of its
charge to C1132 via current through CR1132 and CR1121. This replenishes the
charge drawn from C1132 by the load current during the cycle. As the charge
transfers, the voltage has to drop somewhat, because C*deltaV=I*deltaT,
where T is the period. As the dropping voltage at the curved plate equalizes
with the rising voltage on C1132, the drain on C1130 thru CR1132 stops.
Nothing drains C1130 completely or reverses its charge. So C1130 has some
ripple on top of dc, as is expected of all reservoir caps in a power supply.


The ~50V across C1130, in series with the ~50V out of the transformer, adds
up to make the doubled voltage, cycle after cycle.

From the parts list, C1130 and C1120 are 10uF/100V electrolytics run at
about 50V. C1132 is 10uF/160V run at about 100V. Good engineering.

C1130 should have been drawn with the flat plate to the right, and with a +
sign. I would hope the silkscreen on the board is marked appropriately, but
I don't have a 2465 to check.

Ed, k1ggi

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of woody
wilson
Sent: Monday, March 12, 2018 4:43 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tektronix 2465 capacitors etc. - Going deeper!

There is an alternating voltage across the capacitor and a corresponding
alternating current that is passing through the capacitor. You may find that
some high voltage capacitors actually have a lower esr than low voltage
capacitors, the electrolyte has a direct correlation in regards to the
dissipation factor of the capacitor. I will explain, the higher the voltage
the capacitor, the greater the electrode spacing and depending on the type
of electrolyte the high voltage capacitor needs a greater electrode area for
the same capacitance as lower voltage capacitor, thus high voltage
capacitors do have lower esr.
At the end of the day, a capacitor was open circuit more or less, 1.8nf
measured on a 10uf device pretty well tells me it is dead. I will recap this
2465 with a variety of 450wv and 100wv caps and C1130 will get two 25uf
capacitors connected in series with their positives connected together to
make a long lasting non polarised capacitor.