Reply
 
Thread Tools Display Modes
  #1   Report Post  
Posted to rec.audio.tubes
Don[_4_] Don[_4_] is offline
external usenet poster
 
Posts: 20
Default DC Link film caps in power supplies

Would these caps be used in tube amp powers supplies?
http://www.mouser.com/ProductDetail/...ENPQ5470A8TK/?
qs=sGAEpiMZZMs2uKwa9bPSLt%2fzEPZh9NgOLQ3LXLDwNDo%3 d

If not, what film types are good for PSU?

  #2   Report Post  
Posted to rec.audio.tubes
GRe GRe is offline
external usenet poster
 
Posts: 67
Default DC Link film caps in power supplies

"Don" wrote in message
...
Would these caps be used in tube amp powers supplies?
http://www.mouser.com/ProductDetail/...ENPQ5470A8TK/?
qs=sGAEpiMZZMs2uKwa9bPSLt%2fzEPZh9NgOLQ3LXLDwNDo%3 d

If not, what film types are good for PSU?


If the PS is meant to supply ECC86/6GM8 the caps might be useable.
In PS's for most other tubes they might show popcorn behaviour.


  #3   Report Post  
Posted to rec.audio.tubes
[email protected] arthrnyork@webtv.net is offline
external usenet poster
 
Posts: 81
Default DC Link film caps in power supplies

On Jul 31, 2:45*pm, Don wrote:
Would these caps be used in tube amp powers supplies?http://www.mouser.com/ProductDetail/...ENPQ5470A8TK/?
qs=sGAEpiMZZMs2uKwa9bPSLt%2fzEPZh9NgOLQ3LXLDwNDo%3 d

If not, what film types are good for PSU?


No way !!! A typical tube amp plate voltage is 150VDC and higher . A
lot higher - many filter capacitors are rated at 450V .
  #4   Report Post  
Posted to rec.audio.tubes
Patrick Turner Patrick Turner is offline
external usenet poster
 
Posts: 3,964
Default DC Link film caps in power supplies

On Aug 1, 4:45*am, Don wrote:
Would these caps be used in tube amp powers supplies?http://www.mouser.com/ProductDetail/...ENPQ5470A8TK/?
qs=sGAEpiMZZMs2uKwa9bPSLt%2fzEPZh9NgOLQ3LXLDwNDo%3 d

If not, what film types are good for PSU?


The caps at mouser appear to be 47uF x MKP polypropylene rated for
1,000Vdc which will work fine for tube supply rails up to 700Vdc .
Probably they have a large footprint area, short and fat to go into
modern gear cases which tend to be not very high for SS PCB boards.

But they don't work very well with your wallet.

A cheaper alternative is to use say 470uF rated elecrolytic caps rated
for 450Vdc working in series forup to +430Vdc,
and for higher rails, say up to 700Vdc, 400vdc rated elcaps are OK
with 150k across each cap.
To ensure C remains effective at HF, use 0.47uF x 630Vdc rated
polyprop caps across each 470uF cap.

But if you wish to use a tube rectifier to work with such el-caps then
the C value cannot and must not be above the C value max stated by
rectifier data ratings lest the excessive peak charge currents wreck
the tube rectifier. But this may be overcome by use of series R
between each tube anode and HT winding, say 100 ohms, 10W.

You need to know a whole lot more than what we think you know because
what little you know is indicated by your question, and that you have
not described any other relevant details.

Patrick Turner.
  #5   Report Post  
Posted to rec.audio.tubes
Don[_4_] Don[_4_] is offline
external usenet poster
 
Posts: 20
Default DC Link film caps in power supplies

Patrick said:
The caps at mouser appear to be 47uF x MKP polypropylene rated for
1,000Vdc which will work fine for tube supply rails up to 700Vdc .
Probably they have a large footprint area, short and fat to go into
modern gear cases which tend to be not very high for SS PCB boards.

But they don't work very well with your wallet.

Well, ebay has similar for $12.50 USD, ($11.69 australian dollars) They are
used, but if this type is 'self-repairing' and have
60,000 hours life span, used may be ok.
( ebay item 350452382556 )

I ask because I don't know if they are appropiate for PS use. Sorta like motor
START caps are no good, even though
they are caps with the right voltage, etc.
-Don



  #6   Report Post  
Posted to rec.audio.tubes
Phread[_2_] Phread[_2_] is offline
external usenet poster
 
Posts: 4
Default DC Link film caps in power supplies


"Don" wrote in message ...
Patrick said:
The caps at mouser appear to be 47uF x MKP polypropylene rated for
1,000Vdc which will work fine for tube supply rails up to 700Vdc .
Probably they have a large footprint area, short and fat to go into
modern gear cases which tend to be not very high for SS PCB boards.

But they don't work very well with your wallet.

Well, ebay has similar for $12.50 USD, ($11.69 australian dollars) They are
used, but if this type is 'self-repairing' and have
60,000 hours life span, used may be ok.
( ebay item 350452382556 )

I ask because I don't know if they are appropiate for PS use. Sorta like motor
START caps are no good, even though
they are caps with the right voltage, etc.
-Don


The caps on eBay would make an excellent tube amp power supply. Still expensive
compared to electros, but better in just about every way.

Fred


  #7   Report Post  
Posted to rec.audio.tubes
NT NT is offline
external usenet poster
 
Posts: 27
Default DC Link film caps in power supplies

On Aug 4, 5:38*am, Don wrote:
Patrick said:The caps at mouser appear to be 47uF x *MKP polypropylene rated for
1,000Vdc which will work fine for tube supply rails up to 700Vdc .
Probably they have a large footprint area, short and fat to go into
modern gear cases which tend to be not very high for SS PCB boards.


But they don't work very well with your wallet.


Well, ebay has similar for $12.50 USD, ($11.69 australian dollars) They are
used, but if this type is 'self-repairing' and have
60,000 hours life span, used may be ok.
( ebay item 350452382556 *)

I ask because I don't know if they are appropiate for PS use. Sorta like motor
START caps are no good, even though
they are caps with the right voltage, etc.
-Don


They're fine for PSUs, and should outlast and outrely lytics - but at
a rather steep price. As mentioned they'll also be rather large.


NT
Reply
Thread Tools
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stacked film caps Scott Dorsey Pro Audio 18 December 9th 05 08:03 PM
????10U Film Caps???? Serge Stodolnik Pro Audio 2 February 1st 05 04:24 PM
wima tropifol m polyester film caps -- will they degrade after 40 years?? maxdm Tech 2 August 2nd 04 08:07 AM
film caps age? maxdm Vacuum Tubes 6 July 31st 04 10:06 AM
Film caps suitable for power supply? Henry 007 Vacuum Tubes 17 October 10th 03 03:11 PM


All times are GMT +1. The time now is 02:35 PM.

Powered by: vBulletin
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AudioBanter.com.
The comments are property of their posters.
 

About Us

"It's about Audio and hi-fi"