Blackgate F series 680uF 65v! - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 20th April 2013, 05:41 AM   #1
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Default Blackgate F series 680uF 65v!

Just ordered some Blackgate F series 680uF 65v from
ebay (Indonesia) US$ 10/pc. Later read that these are
very old BG like 15 to 20years. I want to use them to
update the PS stage of my LM3886 based amp. I cannot
go back in the purchase, but some suggestion regarding
usefulness/danger/practicality of using them would be
helpful. Also what kind of precaution should I take as they
are very old?

Thanks
Roushon
__________________
S. Roushon
  Reply With Quote
Old 20th April 2013, 06:04 AM   #2
diyAudio Member
 
Join Date: Oct 2007
Location: Aarhus, Denmark
Hi Roushon,

I don't know about the longevity of these particular electrolytics but I often use electrolytics that are several years' old. Before using them I go through a modified reconditioning process that I found described in a Panasonic capacitor datasheet some years ago. The process is to charge the capacitor to rated voltage slowly (through a quite high resistor value) and then let it stay at the maximum voltage for a minimum of a half hour (often more). Here's an excerpt from a Panasonic HFZ datasheet:

Quote:
5. Long Term Storage
Leakage current of a capacitor increases with long
storage times. The aluminium oxide film deteriorates
as a function of temperature and time. If used
without reconditioning, an abnormally high current
will be required to restore the oxide film. This current
surge could cause the circuit or the capacitor to fail.
Capacitor should be reconditioned by applying rated
voltage in series with a 1000 ohm, current limiting
resistor for a time period of 30 minutes.
Personally I use a higher value than 1 kohm (about 100 kohm for 1000 uF) - just to make sure.

Best regards,

Jesper
__________________
... Being mindful about sustainability also in my audio endeavors matters to me ... paying CO2 - and a quite fair pollution compensation helps create a good listening "energy" ...
  Reply With Quote
Old 20th April 2013, 06:23 AM   #3
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Default Thank you!

Hi Jesper,
Thank you very much for your reply. One
question regarding the charging voltage. I will be using
them to smooth a +-45volt supply and the caps are 65v.
So, what voltage supply should I use for the reconditioning? Is it OK with 45v and a (say) 68k resistor?

Thanks and regards
Roushon.
__________________
S. Roushon
  Reply With Quote
Old 20th April 2013, 06:29 AM   #4
diyAudio Member
 
Join Date: Feb 2011
Location: Calgary
I hope you know that you can buy similar (even fan boy product!) caps from Digikey for much less than $10 per.
  Reply With Quote
Old 20th April 2013, 06:37 AM   #5
diyAudio Member
 
Join Date: Oct 2007
Location: Aarhus, Denmark
Hi Roushon,

My guess would be that you could use 45 VDC but I usually charge them myself to their maximum voltage. In this way I know they've been reconditioned to at least the voltage I'm going to use them at. And, yes I think 68k would be fine but probably would use a 150k myself and then also apply the voltage slowly from low to higher ;-)

Good luck with them ... BTW I once had some Blackgate F or FKs I think and used them in an amplifier I built. Whether it was due to the Blackgates or the design as such I don't know - but the bass and overall rhythm/drive was was speedier & tighter than anything I've made before - or after.

Regards,

Jesper
__________________
... Being mindful about sustainability also in my audio endeavors matters to me ... paying CO2 - and a quite fair pollution compensation helps create a good listening "energy" ...
  Reply With Quote
Old 20th April 2013, 06:43 AM   #6
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Thanks again Jesper.

Regards
Roushon
__________________
S. Roushon
  Reply With Quote
Old 20th April 2013, 06:47 AM   #7
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Quote:
Originally Posted by emerth View Post
I hope you know that you can buy similar (even fan boy product!) caps from Digikey for much less than $10 per.
I did not know that there are caps similar to BG.
I am reading and reading about better caps for Audio for quite sometime and everywhere I am directed to BG caps. So it was buried in my head that BG should be tried. Do not know if it is a debatable subject.

Thanks
Roushon.
__________________
S. Roushon
  Reply With Quote
Old 20th April 2013, 06:56 AM   #8
diyAudio Member
 
Join Date: Feb 2011
Location: Calgary
The word to keep in mind here is "FASHION".
  Reply With Quote
Old 20th April 2013, 07:01 AM   #9
Roushon is offline Roushon  India
diyAudio Member
 
Join Date: Sep 2004
Location: Mumbai (Bombay)
Many people say they are the best. And I took it objectively. Personally am not enough experienced about using different types of caps. So depend on others' opinion.

Thanks
Roushon.
__________________
S. Roushon
  Reply With Quote
Old 20th April 2013, 09:04 AM   #10
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
Almost 100% of BlackGates on ebay are fake these days, real NOS parts got used up years ago
  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
Blackgate N series polarity calvinhpk Parts 8 9th March 2009 04:51 PM
Blackgate F Series sma Parts 1 19th April 2007 09:17 AM
Blackgate n series coupling direction dsavitsk Digital Source 14 27th December 2005 09:57 PM
Blackgate F Series Electrolytic sma Parts 1 24th January 2004 10:57 AM
Blackgate F Series Electrolytic sma Swap Meet 0 24th January 2004 08:22 AM


New To Site? Need Help?

All times are GMT. The time now is 11:28 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