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Question regarding the identification of a component

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  Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 14:38 +0200
    Re: Question regarding the identification of a component "Edward Rawde" <invalid@invalid.invalid> - 2025-09-09 12:01 -0400
      Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 22:08 +0200
    Re: Question regarding the identification of a component Klaus Kragelund <klauskvik@hotmail.com> - 2025-09-09 18:19 +0200
      Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 22:15 +0200
    Re: Question regarding the identification of a component Klaus Kragelund <klauskvik@hotmail.com> - 2025-09-09 18:24 +0200
      Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 22:17 +0200
    Re: Question regarding the identification of a component bitrex <user@example.net> - 2025-09-09 12:19 -0400
      Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 22:12 +0200
        Re: Question regarding the identification of a component "chrisnd@privacy.net" <chrisnd@privacy.net> - 2025-09-10 11:17 +0100
          Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-10 17:38 +0200
            Re: Question regarding the identification of a component "chrisnd@privacy.net" <chrisnd@privacy.net> - 2025-09-10 16:43 +0100
              Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-10 19:06 +0200
    Re: Question regarding the identification of a component Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2025-09-09 17:00 +0000
      Re: Question regarding the identification of a component John R Walliker <jrwalliker@gmail.com> - 2025-09-09 18:57 +0100
        Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-09 21:56 +0200
    Re: Question regarding the identification of a component legg <legg@nospam.magma.ca> - 2025-09-12 08:32 -0400
      Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2025-09-13 22:13 +0200
    Re: Question regarding the identification of a component legg <legg@nospam.magma.ca> - 2025-09-12 08:52 -0400
    Re: Question regarding the identification of a component legg <legg@nospam.magma.ca> - 2025-09-12 09:09 -0400
      Re: Question regarding the identification of a component legg <legg@nospam.magma.ca> - 2025-09-13 13:09 -0400
        Re: Question regarding the identification of a component Theo <theom+news@chiark.greenend.org.uk> - 2026-03-01 18:17 +0000
          Re: Question regarding the identification of a component Reinhard Zwirner <reinhard.zwirner@t-online.de> - 2026-03-02 19:36 +0100
            Re: Question regarding the identification of a component Theo <theom+news@chiark.greenend.org.uk> - 2026-03-04 13:04 +0000

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#6584 — Question regarding the identification of a component

Attention: fup2!

Hello,

In an older power supply unit for GM counter tubes, the high voltage
(max. 1 kV) is generated by a normal push-pull voltage converter
(switching frequency approx. 8 kHz). In the HV filter chain, this

<https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>

capacitor is connected in parallel with the following strangely
marked component of the same size,

<https://s1.directupload.eu/images/250908/62iwvu9p.jpg>

which my Far Eastern multitester identifies as an 8 nF capacitor.
That could well be the case, but why the strange marking? A VDR? What
do you think?

Many thanks in advance for your hints.

Best regards

Reinhard

[toc] | [next] | [standalone]

#6585

"Reinhard Zwirner" <reinhard.zwirner@t-online.de> wrote in message news:mialetF24nnU1@mid.individual.net...
> Attention: fup2!
>
> Hello,
>
> In an older power supply unit for GM counter tubes, the high voltage
> (max. 1 kV) is generated by a normal push-pull voltage converter
> (switching frequency approx. 8 kHz). In the HV filter chain, this
>
> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>
> capacitor is connected in parallel with the following strangely
> marked component of the same size,
>
> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>
> which my Far Eastern multitester identifies as an 8 nF capacitor.
> That could well be the case, but why the strange marking? A VDR? What
> do you think?

The marking suggests that like the other capacitor it's a Sprague component.
You are probably aware that Sprague was known for capacitors, but that
doesn't prove it isn't a thermistor or surge protection component of some kind.
Image search finds nothing with similar markings.
Try applying some volts and see if you get any amps.
Does the converter work without it?
What was the reason for disconnecting it?
How many of these components are there and what are they connected to?

>
> Many thanks in advance for your hints.
>
> Best regards
>
> Reinhard 

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#6592

Edward Rawde schrieb:
> "Reinhard Zwirner" <reinhard.zwirner@t-online.de> wrote in message news:mialetF24nnU1@mid.individual.net...
>> Attention: fup2!
>>
>> Hello,
>>
>> In an older power supply unit for GM counter tubes, the high voltage
>> (max. 1 kV) is generated by a normal push-pull voltage converter
>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>
>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>
>> capacitor is connected in parallel with the following strangely
>> marked component of the same size,
>>
>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>
>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>> That could well be the case, but why the strange marking? A VDR? What
>> do you think?
> 
> The marking suggests that like the other capacitor it's a Sprague component.
> You are probably aware that Sprague was known for capacitors, but that
> doesn't prove it isn't a thermistor or surge protection component of some kind.
> Image search finds nothing with similar markings.
> Try applying some volts and see if you get any amps.

Tested the part with a 2 megohm series resistor at 3 kV (with a
capacitive voltmeter in parallel): no problem.

> Does the converter work without it?

Yes.

> What was the reason for disconnecting it?

To take the best possible photo.

> How many of these components are there and what are they connected to?

Just this one. One side connected to ground, the other side is
connected to the HV line (in parallel with the 10 nF capacitor).

Regards

Reinhard

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#6586

On 09/09/2025 14:38, Reinhard Zwirner wrote:
> Attention: fup2!
> 
> Hello,
> 
> In an older power supply unit for GM counter tubes, the high voltage
> (max. 1 kV) is generated by a normal push-pull voltage converter
> (switching frequency approx. 8 kHz). In the HV filter chain, this
> 
> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
> 
> capacitor is connected in parallel with the following strangely
> marked component of the same size,
> 
> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
> 
> which my Far Eastern multitester identifies as an 8 nF capacitor.
> That could well be the case, but why the strange marking? A VDR? What
> do you think?
> 
> Many thanks in advance for your hints.

That's an old stype disc ceramic capacitor. 10nF, 3kV, Z5U material

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#6594

Klaus Kragelund schrieb:
> On 09/09/2025 14:38, Reinhard Zwirner wrote:
>> Attention: fup2!
>>
>> Hello,
>>
>> In an older power supply unit for GM counter tubes, the high voltage
>> (max. 1 kV) is generated by a normal push-pull voltage converter
>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>
>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>
>> capacitor is connected in parallel with the following strangely
>> marked component of the same size,
>>
>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>
>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>> That could well be the case, but why the strange marking? A VDR? What
>> do you think?
>>
>> Many thanks in advance for your hints.
> 
> That's an old stype disc ceramic capacitor. 10nF, 3kV, Z5U material

Yes, that is the part shown in the first photo.

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#6587

On 09/09/2025 14:38, Reinhard Zwirner wrote:
> Attention: fup2!
> 
> Hello,
> 
> In an older power supply unit for GM counter tubes, the high voltage
> (max. 1 kV) is generated by a normal push-pull voltage converter
> (switching frequency approx. 8 kHz). In the HV filter chain, this
> 
> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
> 
> capacitor is connected in parallel with the following strangely
> marked component of the same size,
> 
> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
> 
> which my Far Eastern multitester identifies as an 8 nF capacitor.
> That could well be the case, but why the strange marking? A VDR? What
> do you think?
> 
> Many thanks in advance for your hints.

That's an old style ceramic disc capacitor. 10nF/3kV, Z5U material.

The other one seems to be a varistor

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#6595

Klaus Kragelund schrieb:
> On 09/09/2025 14:38, Reinhard Zwirner wrote:
>> Attention: fup2!
>>
>> Hello,
>>
>> In an older power supply unit for GM counter tubes, the high voltage
>> (max. 1 kV) is generated by a normal push-pull voltage converter
>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>
>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>
>> capacitor is connected in parallel with the following strangely
>> marked component of the same size,
>>
>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>
>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>> That could well be the case, but why the strange marking? A VDR? What
>> do you think?
>>
>> Many thanks in advance for your hints.
> 

[...]
> The other one seems to be a varistor

Unfortunately, it doesn't behave like one (0 ... 3 kV).

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#6588

On 9/9/2025 8:38 AM, Reinhard Zwirner wrote:
> Attention: fup2!
> 
> Hello,
> 
> In an older power supply unit for GM counter tubes, the high voltage
> (max. 1 kV) is generated by a normal push-pull voltage converter
> (switching frequency approx. 8 kHz). In the HV filter chain, this
> 
> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
> 
> capacitor is connected in parallel with the following strangely
> marked component of the same size,
> 
> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
> 
> which my Far Eastern multitester identifies as an 8 nF capacitor.
> That could well be the case, but why the strange marking? A VDR? What
> do you think?
> 
> Many thanks in advance for your hints.
> 
> Best regards
> 
> Reinhard

Maybe "41C" indicates the transition temperature for a PTC?

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#6593

bitrex schrieb:
> On 9/9/2025 8:38 AM, Reinhard Zwirner wrote:
>> Attention: fup2!
>>
>> Hello,
>>
>> In an older power supply unit for GM counter tubes, the high voltage
>> (max. 1 kV) is generated by a normal push-pull voltage converter
>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>
>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>
>> capacitor is connected in parallel with the following strangely
>> marked component of the same size,
>>
>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>
>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>> That could well be the case, but why the strange marking? A VDR? What
>> do you think?
>>
>> Many thanks in advance for your hints.
>>
>> Best regards
>>
>> Reinhard
> 
> Maybe "41C" indicates the transition temperature for a PTC?

The part behaves in no way as sort of resistor.

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#6596

On 09/09/2025 21:12, Reinhard Zwirner wrote:
> bitrex schrieb:
>> On 9/9/2025 8:38 AM, Reinhard Zwirner wrote:
>>> Attention: fup2!
>>>
>>> Hello,
>>>
>>> In an older power supply unit for GM counter tubes, the high voltage
>>> (max. 1 kV) is generated by a normal push-pull voltage converter
>>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>>
>>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>>
>>> capacitor is connected in parallel with the following strangely
>>> marked component of the same size,
>>>
>>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>>
>>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>>> That could well be the case, but why the strange marking? A VDR? What
>>> do you think?
>>>
>>> Many thanks in advance for your hints.
>>>
>>> Best regards
>>>
>>> Reinhard
>>
>> Maybe "41C" indicates the transition temperature for a PTC?
> 
> The part behaves in no way as sort of resistor.

Unless it has failed, open-circuit?

Chris

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#6597

chrisnd@privacy.net schrieb:
> On 09/09/2025 21:12, Reinhard Zwirner wrote:
>> bitrex schrieb:
>>> On 9/9/2025 8:38 AM, Reinhard Zwirner wrote:
>>>> Attention: fup2!
>>>>
>>>> Hello,
>>>>
>>>> In an older power supply unit for GM counter tubes, the high voltage
>>>> (max. 1 kV) is generated by a normal push-pull voltage converter
>>>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>>>
>>>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>>>
>>>> capacitor is connected in parallel with the following strangely
>>>> marked component of the same size,
>>>>
>>>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>>>
>>>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>>>> That could well be the case, but why the strange marking? A VDR?
>>>> What
>>>> do you think?
>>>>
>>>> Many thanks in advance for your hints.
>>>>
>>>> Best regards
>>>>
>>>> Reinhard
>>>
>>> Maybe "41C" indicates the transition temperature for a PTC?
>>
>> The part behaves in no way as sort of resistor.
> 
> Unless it has failed, open-circuit?

Yes and no. Multitester says: 7,8 nF capacitor. But a capacitor
should just be open circuit, otherwise it's broken. On the other hand
I doubt that a PTC/NTC is connected to ground and a 1 kV line.

Reinhard

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#6598

On 10/09/2025 16:38, Reinhard Zwirner wrote:
> chrisnd@privacy.net schrieb:
>> On 09/09/2025 21:12, Reinhard Zwirner wrote:
>>> bitrex schrieb:
>>>> On 9/9/2025 8:38 AM, Reinhard Zwirner wrote:
>>>>> Attention: fup2!
>>>>>
>>>>> Hello,
>>>>>
>>>>> In an older power supply unit for GM counter tubes, the high voltage
>>>>> (max. 1 kV) is generated by a normal push-pull voltage converter
>>>>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>>>>
>>>>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>>>>
>>>>> capacitor is connected in parallel with the following strangely
>>>>> marked component of the same size,
>>>>>
>>>>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>>>>
>>>>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>>>>> That could well be the case, but why the strange marking? A VDR?
>>>>> What
>>>>> do you think?
>>>>>
>>>>> Many thanks in advance for your hints.
>>>>>
>>>>> Best regards
>>>>>
>>>>> Reinhard
>>>>
>>>> Maybe "41C" indicates the transition temperature for a PTC?
>>>
>>> The part behaves in no way as sort of resistor.
>>
>> Unless it has failed, open-circuit?
> 
> Yes and no. Multitester says: 7,8 nF capacitor. But a capacitor
> should just be open circuit, otherwise it's broken. On the other hand
> I doubt that a PTC/NTC is connected to ground and a 1 kV line.

Sorry, I was still in VDR territory when suggesting open circuit.

Chris

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#6599

chrisnd@privacy.net schrieb:
> On 10/09/2025 16:38, Reinhard Zwirner wrote:
>> chrisnd@privacy.net schrieb:
>>> On 09/09/2025 21:12, Reinhard Zwirner wrote:
>>>> bitrex schrieb:
>>>>> On 9/9/2025 8:38 AM, Reinhard Zwirner wrote:
>>>>>> Attention: fup2!
>>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> In an older power supply unit for GM counter tubes, the high
>>>>>> voltage
>>>>>> (max. 1 kV) is generated by a normal push-pull voltage converter
>>>>>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>>>>>
>>>>>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>>>>>
>>>>>> capacitor is connected in parallel with the following strangely
>>>>>> marked component of the same size,
>>>>>>
>>>>>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>>>>>
>>>>>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>>>>>> That could well be the case, but why the strange marking? A VDR?
>>>>>> What
>>>>>> do you think?
>>>>>>
>>>>>> Many thanks in advance for your hints.
>>>>>>
>>>>>> Best regards
>>>>>>
>>>>>> Reinhard
>>>>>
>>>>> Maybe "41C" indicates the transition temperature for a PTC?
>>>>
>>>> The part behaves in no way as sort of resistor.
>>>
>>> Unless it has failed, open-circuit?
>>
>> Yes and no. Multitester says: 7,8 nF capacitor. But a capacitor
>> should just be open circuit, otherwise it's broken. On the other hand
>> I doubt that a PTC/NTC is connected to ground and a 1 kV line.
> 
> Sorry, I was still in VDR territory when suggesting open circuit.

Don't worry! I just referred to the above mentioned PTC.

I just tested a S20K300 varistor manufactured by EPCOS in series with
a 33 k resistor: limiting startet at approx. 420 V, max. voltage
across this varistor was about 460 V. (Multitester said: 820 pF
capacitor ...). So I think an "open circuit" test result doesn't
prove a 3 kV varistor is broken: my test voltage is limited to "only"
3 kV ...

Regards

Reinhard

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#6589

Reinhard Zwirner <reinhard.zwirner@t-online.de> wrote:
> Attention: fup2!
> 
> Hello,
> 
> In an older power supply unit for GM counter tubes, the high voltage
> (max. 1 kV) is generated by a normal push-pull voltage converter
> (switching frequency approx. 8 kHz). In the HV filter chain, this
> 
> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
> 
> capacitor is connected in parallel with the following strangely
> marked component of the same size,
> 
> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
> 
> which my Far Eastern multitester identifies as an 8 nF capacitor.
> That could well be the case, but why the strange marking? A VDR? What
> do you think?
> 
> Many thanks in advance for your hints.
> 
> Best regards
> 
> Reinhard
> 

Seems pretty skinny for a >1 kV varistor, so I expect it’s a house part
number. 

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics 

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#6590

On 09/09/2025 18:00, Phil Hobbs wrote:
> Reinhard Zwirner <reinhard.zwirner@t-online.de> wrote:
>> Attention: fup2!
>>
>> Hello,
>>
>> In an older power supply unit for GM counter tubes, the high voltage
>> (max. 1 kV) is generated by a normal push-pull voltage converter
>> (switching frequency approx. 8 kHz). In the HV filter chain, this
>>
>> <https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>>
>> capacitor is connected in parallel with the following strangely
>> marked component of the same size,
>>
>> <https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>>
>> which my Far Eastern multitester identifies as an 8 nF capacitor.
>> That could well be the case, but why the strange marking? A VDR? What
>> do you think?
>>
>> Many thanks in advance for your hints.
>>
>> Best regards
>>
>> Reinhard
>>
> 
> Seems pretty skinny for a >1 kV varistor, so I expect it’s a house part
> number.
> 

The front side markings do suggest a 10nF capacitor with Z5U dielectric
and 3kV voltage rating.
A measured capacitance of 8nF is consistent with that, as the Z5U
dielectric is very variable with voltage and temperature as well as
ageing - not to mention initial tolerance which might be +/- 20%.
John


> Cheers
> 
> Phil Hobbs
> 

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#6591

John R Walliker schrieb:

[...]
> The front side markings do suggest a 10nF capacitor with Z5U dielectric
> and 3kV voltage rating.
> A measured capacitance of 8nF is consistent with that, as the Z5U
> dielectric is very variable with voltage and temperature as well as
> ageing - not to mention initial tolerance which might be +/- 20%.

It seems that my post wasn't clear enough. There are two different
components: one is clearly marked as a 10 nF capacitor, while the
other has this cryptic marking.

Reinhard

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#6600

On Tue, 9 Sep 2025 14:38:54 +0200, Reinhard Zwirner
<reinhard.zwirner@t-online.de> wrote:

>Attention: fup2!
>
>Hello,
>
>In an older power supply unit for GM counter tubes, the high voltage
>(max. 1 kV) is generated by a normal push-pull voltage converter
>(switching frequency approx. 8 kHz). In the HV filter chain, this
>
><https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>
>capacitor is connected in parallel with the following strangely
>marked component of the same size,
>
><https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>
>which my Far Eastern multitester identifies as an 8 nF capacitor.
>That could well be the case, but why the strange marking? A VDR? What
>do you think?
>
>Many thanks in advance for your hints.
>
>Best regards
>
>Reinhard

Does the geiger counter have a model number or brand name?

RL?

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#6604

legg schrieb:

[...]
> Does the geiger counter have a model number or brand name?

Hi Legg,

Sorry, but don't know..

The power supply is a separate device for supplying power to external
counter modules.

As there's no problem with the component in question it will stay in
it's place and the riddle unsolved.

Many thanks for all comments and hints.

Best regards

Reinhard

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#6601

On Tue, 9 Sep 2025 14:38:54 +0200, Reinhard Zwirner
<reinhard.zwirner@t-online.de> wrote:

>Attention: fup2!
>
>Hello,
>
>In an older power supply unit for GM counter tubes, the high voltage
>(max. 1 kV) is generated by a normal push-pull voltage converter
>(switching frequency approx. 8 kHz). In the HV filter chain, this
>
><https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>
>capacitor is connected in parallel with the following strangely
>marked component of the same size,
>
><https://s1.directupload.eu/images/250908/62iwvu9p.jpg>

The mfr mark 'sideways 2 or ~ in an oval' shows up on a few 
ceramic disks in my junk collection.

They all have roughly conventional markins, in pF with a 
tempco and voltage. 

Without those markings, they would have been scrapped, 
if they didn't show other useful characteristics, like 
voltage breakdown or spark gap(there are one of those 
with that marking).

RL

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#6602

On Tue, 9 Sep 2025 14:38:54 +0200, Reinhard Zwirner
<reinhard.zwirner@t-online.de> wrote:

>Attention: fup2!
>
>Hello,
>
>In an older power supply unit for GM counter tubes, the high voltage
>(max. 1 kV) is generated by a normal push-pull voltage converter
>(switching frequency approx. 8 kHz). In the HV filter chain, this
>
><https://s1.directupload.eu/images/250908/bsg2w6z7.jpg>
>
>capacitor is connected in parallel with the following strangely
>marked component of the same size,
>
><https://s1.directupload.eu/images/250908/62iwvu9p.jpg>
>
>which my Far Eastern multitester identifies as an 8 nF capacitor.
>That could well be the case, but why the strange marking? A VDR? What
>do you think?
>
>Many thanks in advance for your hints.
>
>Best regards
>
>Reinhard

Logo could be a variation of Nihon Inter Electronics.

http://geek.scorpiorising.ca/F7AC4/RLegg/00_mfr_logo_N-R.html

RL

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