ASC oil caps vs M-tube cap for ps - 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 2nd June 2010, 09:18 PM   #1
phrarod is offline phrarod  United States
diyAudio Member
 
Join Date: Aug 2005
Default ASC oil caps vs M-tube cap for ps

I'm running the ASC Oil-Filled Polypropylene X386 in my line stage power supply project. I'm just about done voicing and in thinking of a case these monsters present a problem.

Has anyone compare the MTube cap against these? I would like to get a little more speed. I don't know if the ASC caps have the old 'oil is slow' quality or not. The MTube sure are more manageable.

Anyone compare these two sonically?
  Reply With Quote
Old 3rd June 2010, 01:07 AM   #2
Gluca is offline Gluca  Italy
diyAudio Member
 
Gluca's Avatar
 
Join Date: Nov 2004
Location: Back to Italy
more speed?
  Reply With Quote
Old 3rd June 2010, 01:13 AM   #3
phrarod is offline phrarod  United States
diyAudio Member
 
Join Date: Aug 2005
Faster. As is speed of attack and impact.
  Reply With Quote
Old 3rd June 2010, 03:29 AM   #4
Gluca is offline Gluca  Italy
diyAudio Member
 
Gluca's Avatar
 
Join Date: Nov 2004
Location: Back to Italy
are you sure it's the PSU and the caps?

(btw X386 are my preferred so far for PSUs)
  Reply With Quote
Old 3rd June 2010, 03:33 AM   #5
phrarod is offline phrarod  United States
diyAudio Member
 
Join Date: Aug 2005
Speed, attack, impact -- in my experience is an effect of the psu. All the rest is in the amp circuit.
  Reply With Quote
Old 3rd June 2010, 11:23 PM   #6
diyAudio Member
 
boywonder's Avatar
 
Join Date: Jan 2008
Location: So.Cal.
Quote:
Originally Posted by phrarod View Post
Speed, attack, impact -- in my experience is an effect of the psu.
In general, what PS attributes are required for good speed/attack?
  Reply With Quote
Old 3rd June 2010, 11:33 PM   #7
kmtang is offline kmtang  Canada
diyAudio Member
 
kmtang's Avatar
 
Join Date: Nov 2004
Location: Vancouver
I have tried both ASC oil and M-Tube Cap but I don't like them much in my preamp.

I have mostly Blackgates for the B+ filtering and cathode bypass.


Johnny
  Reply With Quote
Old 4th June 2010, 12:00 AM   #8
ChrisA is offline ChrisA  United States
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by Gluca View Post
more speed?
He is using "audiophile speak", a sub-dialect of English.

An engineer would say he wants to lower the output impedance of his power supply by using lower ESR caps in the filter section. Same end result.

To answer the question I was browsing the Allied Elect. web site and found some caps made by GE. They are poly film but with good specs values like 100uf (or more) and 850V and under $20 each. They seem to be a low-pain upgrade from aluminium electrolictis for the last stage of CRC power supply filters. I almost was going to order but thought I'd wait until a few days before I really could put one to use. I forgot the intended application but it might have been microwaves or x-ray machines
  Reply With Quote
Old 4th June 2010, 12:36 AM   #9
phrarod is offline phrarod  United States
diyAudio Member
 
Join Date: Aug 2005
Quote:
Originally Posted by ChrisA View Post
He is using "audiophile speak", a sub-dialect of English.


Sorry I thought this was an "audio" forum.

The ASC caps are oil and metalized polypropylene not oil and paper caps. They have bandwidth of over 100kHz with excellent slew rates and very low dielectric absorption. IMHO they sounded better than the best electrolytics I've tried - yes including the black gate. I do not like black gates because they need to reform if left without electricity for long periods of time ie they have to break in again. I've witnessed this with Audio Note gear and the owner admits this. If they are left energized all the time ie power left on then they're ok.

As a friend stated speed is really determined by the dynamic output impedance of the power supply. That is determine by resistance, lead length and type, wire length, the DCR of the power transformer secondary , choke and the dynamic K factor of the rectifier tube.

A capacitor has a slew or charging and dissipation rate, has dielectric absorption and a frequency bandwidth. In general order of ranking.

Film and foil
Metalized film
Oil and Paper
Electrolytic

In other word ChrisA is right. I just would like a smaller package.
  Reply With Quote
Old 20th April 2011, 12:05 PM   #10
diyAudio Member
 
Join Date: Aug 2009
May I know how you connect the additional capacitor? In series to the AC in or parallel across ground (live to ground)?

Thanks
  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
FS ASC oil caps kjunom Swap Meet 3 20th May 2009 07:07 PM
Solen Fast Cap vs ASC film/oils in PS Curly Woods Tubes / Valves 4 3rd September 2008 04:14 PM
spearinol oil (in ASC caps) jarthel Tubes / Valves 1 29th June 2006 04:32 PM
ASC Polypropylene And Oil Capacitors dr._sleep Tubes / Valves 11 23rd October 2005 03:52 AM
Asc Oil Capacitors MlinarS Tubes / Valves 5 31st March 2005 01:41 PM


New To Site? Need Help?

All times are GMT. The time now is 03:22 PM.


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