What Are You Building Today

[Pars]

I guess I might as well post this here:

I have a pair of HifiMan HE4XX (Massdrop) which use the 2.5mm connectors on each headphone. These are crap, and cut out if I move my head the wrong way, etc., so I was toying with replacing them with something better.

I was wondering what other connector types people use, either with experience on commercial headphones, or DIY, and how they like them. I have tried the Mr. Speakers Hirose connectors (on a pair of Aeons) and liked them, but wanted to ask around as there might be something better that I am unaware of. I have also used a Switchcraft mini-XLR 4 pin on my modded Fostex T50s, but for the HifiMan wanted to stick to separate cables to each cup as they are stock.

Plus for something that is around the same diameter as the 2.5mm jacks currently in the headphone cups.

 

[n_maher]

Are the plugs/jacks available that Senn uses on the HD800?

EDIT: seems like they might be.

https://www.amazon.com/Replacement-repair-connector-Sennheiser-Headphones/dp/B074SK4KYN

[Pars]

Thanks Nate. I

ll consider those, but a bit pricey since i would also need the plugs...

[nopants]

I think those are just lemo connectors right? Should be easy to tally up what you need from mouser

[Craig Sawyers]

Could be Lemo's competitor, Fischer. The are tantalizingly close in appearance and incompatible.

[spritzer]

They are made by ODU I believe, same as the HE-1 connectors. 

As for cheaper options, what about the fake Lemo stuff from China?  They are very well made and pretty cheap...

[Pars]

The Lemo stuff always looked kind of long for a headphone connector on the cups, but I've never used them. Also very expensive, think I saw one that was $110 ea.

Which fake China stuff have you used? I'll have to measure and see what I can get away with diameter-wise. I was also looking at SMC connectors, but they might actually be too small in diameter.

[Whitigir]

Oops! Anyways, I use furutech from authorized places is a great way to avoid counterfeit 

Edited October 30, 2018 by Whitigir

[mwl168]

Hmm, I thought the HD800 connectors are Senn’s own proprietary ones. I bought mine off eBay (Chinese counterfeits) when I built my own cable.

If they are Lemo parts, anyone has the part number?

[spritzer]

They are ODU parts, not LEMO.  Can't remember the part number but you can find it on HF.  Senn is using similar parts for the HE-1 connectors. 

As for the fake Lemo, I used something like this:

https://www.ebay.com/itm/1Set-2Pin-Push-Pull-Circular-Aviation-Connector-Compatible-LEMO-0B-FGG-EGG-Serie/171989556108?hash=item280b605b8c:g:Z48AAOSwhcJWOhal:rk:1:pf:1&frcectupt=true

Standard 0B series but they might be a bit long. 

 

Edited October 30, 2018 by spritzer
Added link for ODU

[Whitigir]

Thanks @spritzer, I am corrected

[luvdunhill]

A somewhat of a Franken-Pass.

[luvdunhill]

Installed the front end buffer boards. I will have to adjust DC offset outside of the circuit as the trimmers aren’t oriented the right way to be able to get at in situ.

Now to track down a ground loop :/ (or what I am perceiving as one, based on frequency response graph)

[luvdunhill]

Yay, found the problem. Tomorrow will be listening day!

[swt61]

What's it gonna power Marc?

[lkong]

Got my Voron 2.1 printer somewhat put together.

[Peleus]

It's done ! 

It's low B+ voltage version Aikido Hybrid headphone amp designed by John Broskie. 

However, I replaced the tube, 6GM8, with 12FM6, due to the price of the former is so high to me.

Now, I still fight for terrible hum issue ! 

 

[spritzer]

Well step one for hum issues, keep the input wiring well away from the transformer and its winding's.  

[muskyhuntr]

Step two, some wire twisting wouldn't hurt.

Step three, transformer way too close to amp board.

Did you try your project before you boxed it up.

 

Me

 

[n_maher]

As the others have said, I'd try getting the xfmr out of that box entirely to see if it helps. If it does, welcome to the fun of a 2 box solution and the complications that go along with that. 

[spritzer]

Yup and earth the chassis.  I would never leave anything like this floating. 

[MLA]

To ask away on top of the above  

What’s your grounding scheme? Inputs look floating, is pot floating too? Amp board and psu? A small diagram would be very helpful in troubleshooting.

Also, do you have some form of virtual ground or elevated reference for the heater voltage?

[Peleus]

Hi, guys, 

Thanks for all your advises and suggestions. Our global audio diy community is always warm and encouraged. 

Maybe I provide too little pictures of the amp to give you clear picture of the amp.

It's not virtual grounding, It is designed as single-end amp. And, I made a star grounding in the up-left corner of the above picture.

It's may not clearly to look the grounding due to I used the black wire as grounding line.

After a day working, The Neutrik phone socket may have contacting problem, the sound of one channel is unstable. The layout of grounding wiring will be changed.

Two boxes? It is not may original making idea. I need a small headphone amp, not a huge and expensive one. 

Now, it is Chinese New Year in Taiwan. So, I don't have time to work on this amp.

The more pictures may help your guys to understand, here it is...

 

 

[rumina]

if the case is high enough you can try to mount the transformer standing up, base parallel to the back plate (or mount it direct to the back plate). i would remove the screw of the trafo, turn it up whitout fix mounting to test if the hum is less (if less thats a least one part of the problem).

[Peleus]

Hi, 

After 3 hrs hard work, I rewired the ground loop. Will, it is still not work!!!!

I found this amp is good for the on-ear headphone, although the Huge hum. For the over-ear phone with high resistance, the power is not enough, but no Hum at all.

I...give up, and plan to tear down the tubes part, and to re-layout, from lay-down form to stand-up form.  

And, don't forget to earth the chassis. 

What a mess!