DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 30 Nov 2020, 22:29

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 34 posts ]  Go to page Previous  1, 2, 3, 4
Author Message
PostPosted: 22 Nov 2020, 06:09 
Offline
User avatar

Joined: 01 Jun 2013, 09:05
Posts: 1014
Hi,

I don't screen interconnects if they are driven from a source. (powered)
And in many cases just use twisted pair.

The only time I use a screen is if its from a transducer. (Tape head, cartridge , or very low level signals)
I never use the screen as a signal conductor and usually use a drain wire connected at one end of the cable wrapping the drain wire around the screen..
This means you need to identify the end connected to the drain wire with something like coloured heat shrink. (directional)
If you do use a screen you need to wrap PTFE pipe tape around the cable to insulate and improve the dielectric strength before wrapping the screen around it so there is a PTFE dielectric layer between the signal and the screen.

In years gone by Audio quest made some good cables until you listened to XLO.
https://www.google.co.uk/search?q=XLO+i ... XQ_WL8jqrM


I have no connection to this link its just for interest.
I tried making silver interconnects with some success using these ideas:
I used cotton piping as the core and constructed in this way.
I just used masking tape at regular intervals to hold the wire in place.
Then covered with PTFE tape and plastic cable braiding<<NB you can get conductive carbon fibre to act as a sort of screen but again it needs only connecting at one end.
https://www.venhaus1.com/diysilverinterconnects.html

I could go on but it will probably bore someone.
I tried lots of different conductors and solders and crimping methods.

You have to look at the triboelectric series and look at the types of insulation ideas used in products like Duelund etc.
This gives ideas about static charge and microphonic effects.
I have also looked at plaiting during construction and using reverse crossing similar to the XLO ideas.
In many cables you will find the ends spot welded to the connectors to avoid solder.

I have seen people try to use carbon fibre conductors as well using parts from pipe heating wire.

Regards
M. Gregg

_________________
What is the sound of one hand clapping?


Top
 Profile  
 
PostPosted: 22 Nov 2020, 08:57 
Offline
User avatar

Joined: 01 Jun 2013, 09:05
Posts: 1014
Regarding instrument cable for interconnects,

Only my thoughts YMMV.
It depends on the resolution of the system.
You will hear more cable signature from a passive pre-amp to a power amp than a driven cable from a powered pre-amp.
And if the powered pre-amp has a volume control at the output or not which reduces the drive ability of the preamp.
Because the cable represents the load, ie its capacitive and inductive.
However if the pre-amp creates more problems than not driving the cable then the passive will sound better.

I found that the screened LCOFC is very good with a screen.
And Van Den Hul was very good.
There are some cheap cables that sound very good that maplin sold but you can't get them now.
The guitar cable was a bit of a let down to me but whatever floats your boat.
I never use single core with a shield where the shield becomes one of the conductors.
The idea of the shield is to take any induced noise to ground, but you don't want the signal "mixed" in with it.

NB depending on the system, you might not hear much difference between one and another.
And sometimes its very subtle differences.

Regards the silver plated wire, I have mixed feelings with it.
Firstly you have to accept that there might be a skin effect for it to matter, my experience with PTFE insulated silver plated is that it can sound good.
Where the silver seems to give a lift to the HF and the copper gives bass weight.
But in a resolving system it can sound strange with what seems like the frequency response is no longer flat.
Solid core vs stranded also makes a difference as does cable or strand or the diameter.
I messed about trying putting different sizes of copper or silver in a made up cable and it seemed to change the frequency range.
Now that is strange because I found that simple transformer wire with the insulation worked very well between my speaker terminals and driver.
That was made up as a simple duplex ribbon using masking tape.

There was some interesting information here;
https://jeffsplace.positive-feedback.co ... continues/

So I tried some of the cable as a simple twisted pair and yes it sounds quite good.
NB it takes a while to sound good, OK lets not go there cables don't burn in.
They just seem to :D
I used some of the heavy gauge between my EL84 power amp output Tx to speaker terminals and it sounded very good.
I have no connection with any links or products mentioned.

Off topic but be very, very careful doing anything with power cables in some countries they MUST be double insulated etc.
And regulations apply.

So there is an interesting thought Tin plated cable, based on the old ideas.

Regards
M. Gregg

_________________
What is the sound of one hand clapping?


Top
 Profile  
 
PostPosted: 22 Nov 2020, 09:28 
Offline
User avatar

Joined: 01 Jun 2013, 09:05
Posts: 1014
I should add,

That you may find that the different cables are making the system sound better by cutting or increasing selective frequencies.
Ie the cable is correcting the system response.
Now this can be a PITA because the system is also room dependant. :D
You will find that different cables sound better on different systems, ever wonder why?

So you have to ask what is clarity and what is tone if you are talking about improvement.
The big question is what is improvement when its audio related.

Ie a guitar creates sound, and a HIFI reproduces sound, but does it?
Or does a HiFi create sound and try to reproduce an actual event in a different place ie your listening room.
So the HiFi has to create some magical event that fools you into thinking its real.<<thats not reproducing the actual sound.
Its more than that. :D

Regards
M. Gregg

_________________
What is the sound of one hand clapping?


Top
 Profile  
 
PostPosted: 22 Nov 2020, 21:49 
Offline
Project Author
User avatar

Joined: 04 Jun 2008, 20:59
Posts: 4285
Location: Arizona, USA
Hi, I always screen low level signal interconnects as there is a lot of EMI here. A lot of it comes from the wiring in the ceiling for radiant heat.....even when it is turned off as we now use a heat pump. I like Mogami Quad Neglex 2534. It is for balanced microphones and such. I use two conductors for each the hot and signal ground and the shield on one end only. It depends sometimes on the gear it is attached to which end the shielded one should go to. (Source or destination). It works well for me. YMMV

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 34 posts ]  Go to page Previous  1, 2, 3, 4

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy