Re: Tek 465 multiplier

Samuel Rocha <py1dkw@...>
 

To the Group,
Many thanks for ALL explanations concerning the multiplier construction.
The first one is running just fine,besides the 3kV capacitors, but the second one will be with a pair of 3kV in series. Acrylic resin was used. Next unit for the 468 will be with epoxy filling.
The only doubt is the vacuum proccess of getting the air bubbles off.
I Hope I can repair the 468 too!
Regards to ALL,
Sam




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--------------------------------------------
Em seg, 24/4/17, Fabio Trevisan fabio.tr3visan@... [TekScopes] <TekScopes@...> escreveu:

Assunto: Re: [TekScopes] Tek 465 multiplier
Para: TekScopes@...
Data: Segunda-feira, 24 de Abril de 2017, 17:37


 









Hello David,



Sticking up my nose...



It grabbed my attention that Sam mentioned in his initial
post he'd be

using 3kV caps and I`m confused about that...



Isn't it that the capacitors need to withstand the
peak-to-peak voltage

(i.e. 5kV) ?



As I saw it, I got doubtful if it's the peak voltage or
peak-to-peak...



If it's peak-to-peak, I suppose he need to use - at
least - 6.8kV caps.



Rgrds,



Fabio



2017-04-23 21:55 GMT-03:00 David @DWH
[TekScopes] <

TekScopes@...>:



>

>

> I added a couple of new columns in my spreadsheet for
these

> oscilloscopes.

>

> The 465 and 468 both use the 152-0552-00 5kV
peak-to-peak x3 to 15kV

> multiplier which has a 510 kilohm output resistor. So
as you

> identified, it has 6 diodes. It looks like this except
for a high

> voltage 510 kilohm resistor in series with the
output:

>

>
http://www.nutsvolts.com/uploads/wygwam/NV_0198_Marston_Figure05.jpg

>

> I would air wire it pretty much as shown in the
schematic making sure

> that all joints are nicely rounded by solder to prevent
points which

> would otherwise cause electric field concentrations.
Wrap the solid

> leads around each other before soldering; do not rely
on just the

> mechanical strength of the solder. Then I would coat
all exposed

> wiring in several coatings of corona dope, and then
vacuum pot it.

>

> More than one high voltage resistor can be used in
series adding up to

> about 500 kilohms to get enough voltage rating. The
resistance is not

> critical

>

> For a potting material, I would use wax if I did not
have a suitable

> epoxy resin.

>

> A vacuum chamber can be made from a mason jar and air
compressor. Run

> a test before potting the circuit.

>

> Do not use polystyrene Q dope as corona dope because it
has bubbles in

> it.

>

> On Thu, 20 Apr 2017 19:14:33 +0000 (UTC), you wrote:

>

> >To the Group,

> >I have a 465 and 468 and both scopes need a new
multiplier.

> >I am trying to build one with six diodes and six
2k2 3kv caps since I

> cannot find the original one.

> >

> >Does anyone has a diagram and tips to epoxy the
case?

> >

> >Thanks Very much for any help!

> >Sam

> >Brazil

>

>

















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