You can still buy 9112 and 9301 on eBay but using modern TTL like 7406 (30V 
Open collector inverter) with a 12k pullup to +12V on the output (like the 
construction of the 9112) with a 7442 would probably work just as well.

/Martin

On Monday, 13 October 2025 at 11:57:44 UTC+2 bogdan paduraru wrote:

> 
> 
> 
> Actually I got it from Udo Radke, german collector, his 
> (homemade)design...I wish I had one from TFK or IEE..
> I asked in the past for some good photos of that board too... it would be 
> nice to replicate it
>
> On 12 Oct 2025, at 22:38, Dekatron42 <[email protected]> wrote:
>
> 
>
> Is it a home-built testing unit or something that Telefunke/IEE designed?
>
> I had a look at some photos Robert sent me and found that the circuit 
> board consists of two (2) Fairchild 9112(59) "High Voltage Hex Inverter", 
> one Fairchild 9301(59) "MSI 1 of 10 Decoder" and the SN7475N "4-BIT 
> BISTABLE LATCHES" and some resistors and possibly a 5.1V Zener to supply 
> the SN7475N and Fairchild 9301 with 5V as the two 9112 uses somewhere 
> between 12-20V to interface to the NIMO.
>
> /Martin
>
> On Sunday, 12 October 2025 at 20:36:39 UTC+2 bogdan paduraru wrote:
>
>> I have a testing module for the xm1000 
>> If you " throw it" across Atlantic , I might be able to test it for you 
>>  ☺️
>>
>> On 12 Oct 2025, at 20:55, Robert <[email protected]> wrote:
>>
>> No unfortunately 
>>
>> <image0.jpeg>
>> <image1.jpeg>
>> <image2.jpeg>
>>
>>
>>
>> Thanks
>> Rob
>>
>> On 12 Oct 2025, at 18:51, 'bogdan paduraru' via neonixie-l <
>> [email protected]> wrote:
>>
>> 
>> Have any photos of the IEE version in action?
>>
>> On 12 Oct 2025, at 20:04, Robert <[email protected]> wrote:
>>
>> I’ve got the IEEE version
>>
>> Thanks
>> Rob
>>
>> On 12 Oct 2025, at 17:47, 'Oskar' via neonixie-l <
>> [email protected]> wrote:
>>
>> https://www.ebay.de/itm/357717828612
>>
>> https://www.ebay.de/itm/357732887139
>>
>> Not my auctions
>>
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