anyone ever used metalized polypropylene caps from Digi-key? - 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 26th February 2005, 09:10 AM   #1
crtubes is offline crtubes  United States
diyAudio Member
 
Join Date: Apr 2004
Location: mimicity
Default anyone ever used metalized polypropylene caps from Digi-key?

Digi-key is selling mkps from 3 manufactures:

Panasonic - ECG
BC Components
EPCOS Inc

MKPs from them are cheap. But there're rarely discussions about these caps. how do they sound compare to, let's say, the same cheap MKPs from Solen, Dayton, etc?
  Reply With Quote
Old 27th February 2005, 11:11 PM   #2
diyAudio Member
 
wrenchone's Avatar
 
Join Date: Feb 2004
Location: Silicon Valley
The end terminations are very good on the Panasonic caps. If you get the right series, they are rated for low loss/high ripple current. I don't know how that translates to sound quality, though.
I'm currently using GE and Sprague low loss polypropylenes in my preamp, as I had them on hand. I haven't done any comparisons with other caps, though this preamp sounds loads more detailed than my old Nikko, which had about 5 electrolytics in series with the signal chain...
  Reply With Quote
Old 28th February 2005, 02:44 AM   #3
diyAudio Member
 
Join Date: Oct 2004
Location: Adelaide South Oz
Default Polypropylene Caps

The "Metalised" Poypropylene are what are commonly known as "Film" types. My experience is that as far as sonics are concerned the "Film and Foil" types are superior. Unfortunately the "Film and Foil" types are often not available in the higher voltage ratings (ie above say 400V).

On the subject of capacitors I have had very good results recently using Polyphenylene Sulphide (PPS). This is the dielectric which was introduced to replace Polycarbonate when it dissappeared from the marketplace BUT I feel that they are far better than Polycarbonate ever was. Especially good for paralleling electrolytics ro miantain high frequency behaviour. The other thing about them for valve circuitry is the 125 to 150 degrees C temperature rating. Once again ONLY available ro about 400V rating. Half the price of Polypropylene for at least 90-95% of its performance.

Cheers,
Ian
  Reply With Quote
Old 28th February 2005, 05:41 AM   #4
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
I've been wondering about them myself. How many volts of 50kHz do you suppose they could handle before melting?

Tim
__________________
Seven Transistor Labs
Projects and Resources
  Reply With Quote
Old 28th February 2005, 06:33 AM   #5
diyAudio Member
 
Join Date: Oct 2004
Location: Adelaide South Oz
I assume you mean the PPS - the short answer, to put it in the OZ vernacular is "DUNO".
The ones I use are Evox Rifa SMR Series. Check out their web pages.
Cheers,
Ian
  Reply With Quote
Old 15th September 2005, 10:16 PM   #6
diyAudio Member
 
Joe Rasmussen's Avatar
 
Join Date: Jan 2003
Location: Sydney, Australia
Send a message via MSN to Joe Rasmussen
Quote:
Originally posted by gingertube
I assume you mean the PPS - the short answer, to put it in the OZ vernacular is "DUNO".
The ones I use are Evox Rifa SMR Series. Check out their web pages.
Cheers,
Ian
Hi Ian

I am in Sydney. Where in Oz are you getting SMR caps? I am trying to find a local supplier, local as in Australia rather o/seas.

Joe R.
__________________
The "Elsinore Project" DIY Speaker System
Custom Analogue Audio - we also support and promote non-profit DIY
  Reply With Quote
Old 16th September 2005, 12:47 AM   #7
diyAudio Member
 
Join Date: Oct 2004
Location: Adelaide South Oz
G'day Joe,
I bought mine from Farnell (small quantities so I was'nt fussed about paying the mark up).
One of the advantages to working for a big company is that I have access to tools like Australian Electronics Directory Plus. It tells me that the Oz importers for Evox Rifa are:
Connektron P/L,
Phone Sydney 9597-6411
Web www.connecktron.com.au
Cheers,
Ian
  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
Polypropylene caps liberty Tubes / Valves 21 31st August 2009 07:04 AM
10 uF Polypropylene caps dsrjohn Parts 9 5th May 2004 02:30 AM
Where to get polypropylene caps with <2,5% tolerance in Norway? Alcaid Parts 5 23rd February 2004 09:54 PM
Precision polypropylene 1% caps - any good? peranders Parts 44 16th March 2003 05:31 PM


New To Site? Need Help?

All times are GMT. The time now is 07:58 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