Is this feasible? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 22nd January 2007, 07:48 PM   #1
diyAudio Member
 
Join Date: Jan 2007
Default Is this feasable?

Hello everyone,

I am huge into headphones and love my system as it currently stands (in my sig). The centerpeice of it is the fairly rare Melos SHA-Gold Reference, which I brought to another level by blackgating and auricapping it. Here are some pics:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


Anyways, now that I'm purchasing either a Cary Audio or Wadia CD player (undecided), I've been bitten by the balanced bug. I need to hear my Grado RS-1's balanced! But at the same time, I am unwilling to let go of my beloved Melos. One possible soultion would be to create a balanced Melos.

Now from what I can tell, the way the Melos is set up stock it would be capable (assuming you have two Melos units) of running balanced. All that would need to be done is to make some custom cables that allowed me to go from the balanced outs on the cd player and run the left channel into one amp and the right channel into another amp out to reterminated balanced headphones. If I am correct, this would be fully balanced operation with all of the benefits.

But of course, who wants two identical cases sitting there? Also, I would want XLR connections for the headphones, not dual mono plugs. They just sound better. This got me thinking, what if I put the two Melos units in one enclosure and wired them up to have XLR connectors? This certainly appears technically possible to me. Am I missing something?

I could even retain the Melos' styling ques by working with Par-Metals to have them custom fab me a larger version of the Melos case capable of fitting two circuit boards in it and perhaps with large heatsinks on the side.

I have plenty of experience soldering and with DIY, I just want some reassurance that what I'm doing will work before I splash out another $1500 for another Melos and associated costs. Any help would be tremendously appreciated.
  Reply With Quote
Old 7th January 2008, 02:27 AM   #2
diyAudio Member
 
Join Date: Oct 2005
Default Melos Gold

I am new here. Apparently I cannot email until I post a bit.

Is there a parts list I can get for Melos Gold Mods??

Thanks!
  Reply With Quote
Old 7th January 2008, 03:19 PM   #3
diyAudio Member
 
Richard Ellis's Avatar
 
Join Date: Sep 2006
Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
Default Headphones..

Computerpro..
Just some observations for ya..

The proximity of those sweet caps between your tubes..they are way too close! Think heat buildup. It almost looks as if those caps are touching the tube on the right. Its' gonna roast that cap!
I also noticed almost all of your TO-220 devices do not have a heatsink....I know it is a "factory' PCB but a simple clip-on type sink will help things out....someone must have designed with derating of said TO-220 devices.
I'm just thinking of you zoning out hours on end while all that heat is building up...the wirewound resistors slowly charring the PCB because they designed it with them slammed down onto the PCB.
I know when we design circuits we choose power values(Watts) that are way conservative but factory stuff should allways be suspect.
__________________________________Rick............ ...
  Reply With Quote
Old 7th January 2008, 05:14 PM   #4
diyAudio Member
 
korneluk's Avatar
 
Join Date: Jan 2005
Location: South Florida
Default Re: Is this feasable?

Quote:
Originally posted by computerpro3
Hello everyone,

I am huge into headphones and love my system as it currently stands (in my sig). The centerpeice of it is the fairly rare Melos SHA-Gold Reference, which I brought to another level by blackgating and auricapping it. Here are some pics:

Computerpro3,

Would you happent to have a schematic for the Melos. I had one but lost it due to a hard drive crash and now I need it to fix my own SHA-Gold.

TIA,

-- josť k.
  Reply With Quote
Old 8th January 2008, 04:31 PM   #5
diyAudio Member
 
Alastair E's Avatar
 
Join Date: Feb 2004
Location: South Wales
Default Re: Headphones..

Quote:
Originally posted by Richard Ellis
Computerpro..
Just some observations for ya..

The proximity of those sweet caps between your tubes..they are way too close! Think heat buildup. It almost looks as if those caps are touching the tube on the right. Its' gonna roast that cap!
I also noticed almost all of your TO-220 devices do not have a heatsink....I know it is a "factory' PCB but a simple clip-on type sink will help things out....someone must have designed with derating of said TO-220 devices.
I'm just thinking of you zoning out hours on end while all that heat is building up...the wirewound resistors slowly charring the PCB because they designed it with them slammed down onto the PCB.
I know when we design circuits we choose power values(Watts) that are way conservative but factory stuff should allways be suspect.
__________________________________Rick............ ...

Exactly what I was thinking......

Looks like things in there have been getting quite hot for some considerable time anyway....

IMO, this does not look to be a particularly well made device--No offence, I'm sure it sound wonderful, just not well made!
__________________
Das Beste Oder Nichts
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
UcD400HG Layout Feasible? Bernie7 Class D 1 9th May 2009 03:59 PM
Use of large pro driver as OB-feasible?? terry j Multi-Way 25 26th April 2007 04:01 PM
Rear speaker - feasible??????? rabbitz Multi-Way 24 11th August 2003 04:50 PM


New To Site? Need Help?

All times are GMT. The time now is 08:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2