Author Topic: neutrik tt402a , reading 20db low  (Read 654 times)

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Offline NorfolkDaveUKTopic starter

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neutrik tt402a , reading 20db low
« on: April 21, 2024, 04:09:24 pm »
Hey all hope you are all well, I have an issue with a neutrik tt402a I recently bought , I'm a reel to reel tech for the most part so , this will come in very handy if I can make it work well. I'm using a ferrograph RTS 2 and APU combo at the moment . So here's the story .

I bought it on eBay and it was filthy , and the case was battered but inside is was pretty much mint. , I have recapped the power supply , and a few other board , i.e. the meter driver board , the gain chain etc , and here's where I'm at . So when I bought it it would read freq perfectly , but wouldn't read amplitude at all , I traced that to a problem on the "spare filter" board and on removal of that , it brought back the ability to read amplitude , however , its reading it 20db low . So if I feed 0dbm (775) from my rts into it , it reads it as -20dbm , likewise if I send a signal from the tt402a to the rts , it will read 0dbm on the rts and -20db on the tt402a .

Now here is the problem , this thing is very rare , I can't find a schematic for it anywhere , believe me I have hunted and hunted , and there is nothing , I contacted neutrik , no reply  . So , I have no clue really other than my reasonable knowledge of electronics and audio gear / logic . If anyone has any idea what's going on here or where I might gets some hints as tomhow to put this right I would be very very grateful .

Thanks in advance guys and happy sparking !!
 

Offline calibrationfixture

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  • Country: nl
Re: neutrik tt402a , reading 20db low
« Reply #1 on: December 29, 2024, 09:54:40 am »
Hi NorfolkDaveUK,

Around Februar in the coming year I have to service a Neutrik TT-402(A?). It has a full set of Manuals. Thus a little patience (Owner is on Holiday for quite a while).

Calibrationfixture
« Last Edit: December 29, 2024, 10:20:58 am by calibrationfixture »
 

Offline 707dave

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  • Country: gb
Re: neutrik tt402a , reading 20db low
« Reply #2 on: January 02, 2025, 05:10:37 pm »
Hi,
I'd also be greatful for any information you can supply from these manuals - are you hoping to scan them?
My unit is misbehaving - the distortion filter is not auto tracking.

Regards
David
 


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