Nytech CTA 252 XD Playing in MONO

[dantheman91]

Hi Guys

I brought the Nytech CTA 252 XD its working but its only playing in MONO on CD MONO switch is Off and tried different cables which are fine with my Quad amps Tried a different link adapter and its still the same a rather odd problem unless someone has wired it for MONO only :scratch:

Any help would be much appreciated i would love to get this unit going but it was not cheap to start with no i can't get a refund as i tested it and said it was OK..

Doh....

[Light Dependant Resistor]

Hi Dan
A fault creating Mono hmm interesting - there is a Nytech appreciation thread at Pink Fish https://pinkfishmedia.net/forum/threads/nytech-audio-ion-systems-appreciation-thread.107603/
If the front sockets are headphones try inserting a headphone plug - the options are it is wired so audio cancels the main audio or allows audio through - but at the same time
a position in the circuit where a mono-ing fault might be occurring ie where Left and Right are very close together.

[dantheman91]

Hi Chris

Very Helpful Info i have posted on PFM - i have tried the headphone technique still the same do you need 2 jacks to cancel it out?

[Lawrence001]

can you post a pic of the innards in case it's something obvious in the wiring eg.mono switch bypassed to on.

Sent from my BLN-L21 using Tapatalk

[dantheman91]

Hi Lawrence

I will get some photos up tomorrow but i had a look and their is not a lot to see but will do the photos - Thanks for the help..

Thank you

[Lurch]

Are there any internal fuses, and if so has one of them blown taking down a channel?

[dantheman91]

Are there any internal fuses, and if so has one of them blown taking down a channel?

Hi John

I have had a look with the bottom case off and their is really nothing to see - You could have a fair point about a fuse and when i move the balance to the right it moves to the right speaker but when altered to left their is no swap it stays the same as in MONO so i think we are onto something with a fuse.

:)

[Jazid]

To make it clearer:

Is it outputting from one channel only, or both channels but outputting the same from both?

Is it only taking input from one channel, or do the inputs work from both channels and they are then summed to produce the mono output?

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[Scooby]

Not sure how Nytech are configured, but might it be the Din cable being used is the wrong pin configuration?

[dantheman91]

To make it clearer:

Is it outputting from one channel only, or both channels but outputting the same from both?

Is it only taking input from one channel, or do the inputs work from both channels and they are then summed to produce the mono output?

Sent from my BLA-L09 using Tapatalk

Hi James

I seem to think its outputting for Right hand channel only but coming out of both speakers which is awfully strange both left and right channels are producing sound but its wired to right only as when i move the balance to the right it follows the speaker but when i move it to left it stays the same its complex for me to describe but hopefully i'm making it clear..

Please let me know if this is helping..

[dantheman91]

Not sure how Nytech are configured, but might it be the Din cable being used is the wrong pin configuration?

Hi Andy

Could be i'm in the process of talking to Phil Ballam and hope we can work out the fault..

Thank you
Dan

[struth]

Hi James

I seem to think its outputting for Right hand channel only but coming out of both speakers which is awfully strange both left and right channels are producing sound but its wired to right only as when i move the balance to the right it follows the speaker but when i move it to left it stays the same its complex for me to describe but hopefully i'm making it clear..

Please let me know if this is helping..

could be wiring is wrong..

[dantheman91]

Hi Guys

If this helps -

Just tried L&R - Left disconnected from CD player sound still in both speakers balance in the middle - Right Disconnected sound still in both speakers balance in the middle - when altered to the left to right it goes silent so the channels are their :scratch:

Something still a miss though..

[dantheman91]

Help from PFM i have tried a different DIN in the preamp section and this confirms their is output to both left and right channels under light touch on the pins.

[Lawrence001]

Interesting history here, it says they were often used in an active setup driving HF/LF on one channel, I wonder if that is achieved with the mono button or an external/internal switch/link.

https://zstereo.co.uk/2013/10/28/nytech-cta252/


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[Jazid]

Help from PFM i have tried a different DIN in the preamp section and this confirms their is output to both left and right channels under light touch on the pins.

I don't know the Nytech circuit so could be talking rubbish but it looks to me like there's a fault at the mono/stereo switch (if there is one). Both channels seem to be working and appear to be being summed. That's going to happen after a gain/buffer stage I'd suspect. If I'm correct and there's a tape out then that might still be working in stereo if you can try it? If not it takes the fault to even earlier in the circuit.

Either its been hard wired for mono - might have been done many moons ago - or it might be a failed mono switch or shorted pin on it. It should be easy to check if you can get it open. At least both channels are working!

[dantheman91]

Hi James

Thanks for the Info - i have been quoted £300 by nytech for a full service but i just want to see if it can be converted to stereo are their any kind hearted souls on here willing to take a look for me?

[dantheman91]

Just taken it In for repair with a local repair company.

[dantheman91]

It a Pre amplifier Board Fault but guy said like looking for Needle in a Haystack someones been in their in the past..

Any Back up Ideas - I know nytech do new boards at £50 - I already have £100 all in on this already do i put it to one side or get another another opinion?

[Hypnotist]

Its a good amp and the repair costs wont buy much of a replacement, i'd get it repaired if you've been happy with it.

[dantheman91]

Sending it to another Tech for work just on the Preamp Board Phil at nytech said its common if someone has been in their which they have as the phono cables are different - Could be a Pin misaligned on the board

Update in due course..

[dantheman91]

Well hopefully on the road to recovery its at another tech - The guy who sold it knew of the problem hence why he's not responding to my emails Bastard.

[Hypnotist]

I hate that when people know the item is faulty and sell it on, says a lot about who they are as a person and what they think of others, send the guy the bill to get it repaired.

[dantheman91]

Well its the end of the road for this one someones bodged the board so much its beyond economical repair.