Welcome
Welcome to DaveyW's Vinyl Corner Forum

You are currently viewing the board as a guest, which gives you limited access.
By joining the free community, you will be able to ask any questions regarding the contents of the Vinyl Corner site, respond to posts, communicate privately with other members (PM), respond to polls and upload content.
In addition, registered members see no advertisements.
Registration is fast, simple, and free, so why not join the forum and get involved.
Looking forward to hearing from you.
DaveyW

Dual 1219 Tonearm Rewire

Dual 1219 Tonearm Rewire

Postby DaveyW » Sun Mar 20, 2016 10:26 pm

WARNING! Long post with lots of pics :siren :P

For the last few weeks I've been mostly spinning with the Sondek, initially enjoying the Astrion and more recently the new tonearm cable.

Fancied giving the Dual a run out over the weekend, but the lay off had let the left channel Gremlins return :evil:
This time being quiet with a noticeable hiss.

Contacts on the sled and arm looked good - tried a cart/sled swap

Image

Exactly the same :evil: :evil:

Out came the DVM - Sled contact to end of phono cable;

Right: 1 ohm
Right/Left Ground: 0.3 ohm
Left: 12 ohm

But on moving the arm the Left channel started to vary and ranged between 7-40 ohms - Not Good!

Deck came out of the plinth this morning and the venture began

Image

It became clear quite quickly that the issue was unfortunately in the actual tonearm cable (as opposed to the muting switch and RCA connector points)

All looked OK at the tonearm end

Image

But I know how delicate these wires have become over time.
They are over forty years old and one connection at the muting switch had previously perished.

So further investigation

I popped the connector board out of the arm by gently inserting a small screwdriver and twisting

Image

Again nothing too obvious

Image

I tried to re-wet the connections with a soldering iron and at this point the fine wire on the Left channel broke away - very brittle

OK so no options now - A full re-wire was definitely required

Did a spot of Googling to order something suitable, then remembered reading a few posts on audio forums extolling the virtues of computer mouse cable

Had a rummage in the computer spares box and found an old mouse

Not much to lose really - Lets give it a whirl :P

Image

Five strand wire - but only need four for this deck

Image

Let's get to it!

Connector board removed from the existing tonearm wires (didn't take too much effort :grin: )

Image

De-soldered and cleaned up

Image

New wires threaded through the same path as the old

Image

Tightly taped at the end to assist

Image

And then threaded into.......

Image

.......and out of the tonearm tube

Image

Arm connector board then re-soldered

Image

Image

Note: That bridging across the ground channel is intentional - Honest :nodding

And re-inserted into the arm

Image

Old wires stripped off the muting switch

Image

And replaced with the new

Image

And taped back to ensure nothing loose

Image

The cables post the muting switch to the RCA connectors are much chunkier and measured zero resistance - these stayed as was


OK Moment of truth! :?

Out came the DVM and tonearm board to end of phono cable resistance re-measured

All lines read 0.1-0.2 Ohms :Banana

Everything then packed away and the deck returned to the plinth

Shure M97 with Jico SAS installed

No hiss, no hum, just total silence :cool:

Disc duly pulled from the racks and auto play lever flicked

The arm rises, then moves towards the disc, stops on the lead in and gently lowers ...................

Image


YES! Everything sounds fantastic :Banana :Banana :Banana

It's getting late now - Can't turn it up to really see if I can hear a general improvement prior to this latest issue.
But........... first low level impressions leave me strongly suspecting so.

This will have to wait until tomorrow.

All in though, a very satisfying days work
Am very much looking forward to some listening time over the next few days :nodding
User avatar
DaveyW
Site Admin
 
Posts: 4398
Joined: Sat Sep 22, 2012 9:41 am
Location: Warwickshire - England

Re: Dual 1219 Tonearm Rewire

Postby bauzace50 » Sun Mar 20, 2016 11:58 pm

DaveyW,
That is meticulous work!
May you s9oon enjoy the fruits of your labor!
User avatar
bauzace50
 
Posts: 2195
Joined: Mon Oct 15, 2012 4:18 pm
Location: Guayama, Puerto Rico

Re: Dual 1219 Tonearm Rewire

Postby DaveyW » Mon Mar 21, 2016 9:38 pm

Thanks B50 :thumb

Had a bit of a side distraction tonight :grin:
Will report on that here in due course

This though is sounding just superb with the M97/Jico SAS

Image

There's definitely more bottom end with the new tonearm cable and it's lovely and tight.
Everything else is crisp and clear as a bell - All very, very nice indeed :beer
User avatar
DaveyW
Site Admin
 
Posts: 4398
Joined: Sat Sep 22, 2012 9:41 am
Location: Warwickshire - England

Re: Dual 1219 Tonearm Rewire

Postby bauzace50 » Mon Mar 21, 2016 11:38 pm

:Banana Achh! Celebrate! Celebrate!
Good news!!
User avatar
bauzace50
 
Posts: 2195
Joined: Mon Oct 15, 2012 4:18 pm
Location: Guayama, Puerto Rico

Re: Dual 1219 Tonearm Rewire

Postby Pumpkinman » Tue Mar 22, 2016 12:05 am

Image



I have to give you a lot of credit Davey. I wouldn't have attempted it. :2thumb :2thumb :2thumb
Here By The Sea And Sand Nothing Ever Goes As Planned.............P-man
User avatar
Pumpkinman
 
Posts: 5500
Joined: Sun Sep 23, 2012 2:55 am
Location: The Pocono Mountains Eastern PA.

Re: Dual 1219 Tonearm Rewire

Postby tmazz » Tue Mar 22, 2016 3:23 am

Pumpkinman wrote:Image



I have to give you a lot of credit Davey. I wouldn't have attempted it. :2thumb :2thumb :2thumb


+1
The Vinyl Vampire

Remember, it's all about the music...........
User avatar
tmazz
 
Posts: 2883
Joined: Sat Jun 08, 2013 9:22 pm
Location: Long Island, USA

Re: Dual 1219 Tonearm Rewire

Postby DaveyW » Tue Mar 22, 2016 9:17 pm

Thanks Guys :thumb

Love the Certificate - I think I'll have to frame it :mrgreen:
User avatar
DaveyW
Site Admin
 
Posts: 4398
Joined: Sat Sep 22, 2012 9:41 am
Location: Warwickshire - England

Re: Dual 1219 Tonearm Rewire

Postby beatcomber » Sat Apr 16, 2016 6:13 pm

NICE WORK, Dave! You make it look simple! :rock
User avatar
beatcomber
 
Posts: 242
Joined: Tue Oct 23, 2012 3:11 pm
Location: Lexington, Massachusetts, USA

Re: Dual 1219 Tonearm Rewire

Postby DaveyW » Sat Apr 16, 2016 7:35 pm

Thanks BC :thumb

It was reasonably straight forward, but I doubt I would have embarked on this if it wasn't for the fact that the cable had perished.

I think the main message here is, if you suspect a problem with the main tonearm wire, no need to be too daunted about tackling it yourself.
User avatar
DaveyW
Site Admin
 
Posts: 4398
Joined: Sat Sep 22, 2012 9:41 am
Location: Warwickshire - England

Re: Dual 1219 Tonearm Rewire

Postby bauzace50 » Sun Apr 17, 2016 12:20 am

Mmm...the very best ones make it look easy, simple and effortless!
User avatar
bauzace50
 
Posts: 2195
Joined: Mon Oct 15, 2012 4:18 pm
Location: Guayama, Puerto Rico


Return to Member Projects & Gear

Who is online

Users browsing this forum: No registered users and 1 guest

cron
suspicion-preferred