Adapting 3.5mm headphones plug to 1/4" Jack

Your username sounds like it was from the song by Tears for Fears called "Shout" just read the lyrics. 

Question - Why would you want to? This is a very OLD Sansui with a SNR that is very low. 

Look for Sansui integrated amplifiers made in or after 1997, That’s where the real good headphone outs were implemented. Prior to that, they were "experimenting" and a lot of their older stuff would become defective for no good reason. The engineering really matured after 1997.

Examples: 

AU-α607NRA    
AU-α707NRA    
AU-α907NRA    
AU-α607NRAII    
A-α7
A-α9
 

I have heard or owned practically all of them at some point in my journey. And guess what? Their headphone outs make a whole bunch of of modern headphone amps sound basic. Plenty of power on tap too, will drive your headphones with ease and clarity, with a speaker-like sound if open-backed.

And lastly (for now) here's the adapter you want: Planet Waves PW-P047E Headphone Adapter TRS 3.5mm to 6.3mm TRS– Badie Studio & Stores

Totally lossless, no micro-arching /vibrations like run of the mill super cheap adapters. Lasts forever. I have many.

https://www.audioquest.com/products/3-5mm-headphone-adaptor?srsltid=AfmBOoq4pLW-e9mXqqEYfuUhX-S2Ke4sCtNEaTNSvuuJtBSNuHZxo4JU

Sorry, didn't notice it had been discontinued.  Might be found used.

@mofimadness 

recommending discontinued items I see? 

and not anywhere as good as the PW-P047E.

@frank009...your link is for a location in Qatar?

How about this one:

https://www.amazon.com/Planet-Waves-Female-Stereo-Adapter/dp/B0002E51CQ?th=1

Thanks Frank. Well the decision on the AU-101 was its tube like sound and really good phono stage (waiting on the one I bought to arrive) mostly for a small speaker based system in my bedroom. In addition I want to be able to demo used turntables in a show/fair type environment where decent headphones would really be the way to hear the sound quality when you can't really play music through speakers. I didn't realize the headphone output wasn't that good. 

Thanks for the adapter link - I will check it out.

So then maybe a new question would be what is a decent sounding affordable way to play MM tables through headphones? Not need for critical listening. But maybe a good bang for buck headphone amp with phono in or two separates would work too.