Need recommendation for cathode bypass cap

andy2 · 11th February 2006, 04:55 AM

The current value is 100uf/250V. Could someone recommend a good brand?

SHiFTY · 11th February 2006, 07:50 AM

I have used Nichicon Muse from angela.com before with good results.

That is quite a high voltage rating though, I wouldn't have thought it would need to be that high. What tube is it used on and what voltage is across it? If it is only a few tens of volts, you will be able to get away with a lower voltage rating.

arnoldc · 11th February 2006, 08:19 AM

i would second the Nichicon Muse. I also used Panasonic Tsha and Black Gate Standard.

I would like to try film though, although a friend said that the Black Gate sounded better compared to a Solen on his Airthight 300B.

andy2 · 11th February 2006, 02:17 PM

Quote:

Originally posted by arnoldc
i would second the Nichicon Muse. I also used Panasonic Tsha and Black Gate Standard.

I would like to try film though, although a friend said that the Black Gate sounded better compared to a Solen on his Airthight 300B.

Can you use bipolar cap for cathode bypass? I think the one in the amp is unipolar.

vconsumer · 11th February 2006, 05:18 PM

I suspect that by "bipolar" you mean a non-polarized cap, like a film cap without "+" and "-" terminals. Yes, you can use a non-polarized cap.

rdf · 11th February 2006, 05:47 PM

If chassis permits also consider a polyprop and oil motor run cap. Relatively cheap and excellent quality:

http://cgi.ebay.ca/100-uF-Oil-Run-Ca...QQcmdZViewItem

If you decide on this route and it's important to you, this version of ASC sold by the above E-bay dealer has non-magnetic electrode terminals. The terminals of the domestic ASCs I bought from Digikey are strongly magnetic.

Tube_Dude · 11th February 2006, 05:54 PM

Quote:

Originally posted by rdf
If chassis permits also consider a polyprop and oil motor run cap.

I think that is to big and then susceptible to stray noise pick up...only for a output stage, I'm afraid.

In some positions ..."size matters"...

rdf · 11th February 2006, 06:10 PM

Quote:

"I think that is to big and then susceptible to stray noise pick up...only for a output stage, I'm afraid."

Not at all! The internals are shielded and the terminals are actually quite close together, about 1/2" solder to solder between the inner tangs. Conicidentally I type this while listening to a single stage headphone amp using exactly those caps in an Ultrapath position around a very high transconductance triode, the 6C45-PE. Keeping in mind Ultrapath is reputedly more prone to PS noise than typical layouts the noise spectrum of this circuit constructed on open plywood looks like (hot off the press

):

(post edited for multipull spalling errurs)

andy2 · 12th February 2006, 07:47 AM

Quote:

Originally posted by SHiFTY
I have used Nichicon Muse from angela.com before with good results.

That is quite a high voltage rating though, I wouldn't have thought it would need to be that high. What tube is it used on and what voltage is across it? If it is only a few tens of volts, you will be able to get away with a lower voltage rating.

Shifty,

Here is the schematic.
http://www.geocities.com/hai_vu1/schematic.JPG
I am not familiar with tube amp so not sure why the rating has to be that high. The amp uses two 300B per channel which results in 22W.

refference · 15th February 2006, 01:46 AM

Hi andy2 ,

I saw the schematic diagram of your amplifier , and the value of cathode by-pass caps of output tubes is absolutely correct .

You can try another brand to see if it results in the sound's improvement . but don't try to change the rating ( uf and WVDC ) .

Try to use brands like Nichicon , Nipon Chemical , etc.

Regards

Carlos

11th February 2006, 04:55 AM	#1
andy2 diyAudio Member Join Date: Nov 2004 Location: Los Angeles	Need recommendation for cathode bypass cap The current value is 100uf/250V. Could someone recommend a good brand?

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11th February 2006, 07:50 AM	#2
SHiFTY diyAudio Member Join Date: Jul 2002 Location: New Zealand	I have used Nichicon Muse from angela.com before with good results. That is quite a high voltage rating though, I wouldn't have thought it would need to be that high. What tube is it used on and what voltage is across it? If it is only a few tens of volts, you will be able to get away with a lower voltage rating.

11th February 2006, 08:19 AM	#3
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	i would second the Nichicon Muse. I also used Panasonic Tsha and Black Gate Standard. I would like to try film though, although a friend said that the Black Gate sounded better compared to a Solen on his Airthight 300B.

11th February 2006, 05:18 PM	#5
vconsumer diyAudio Member Join Date: Nov 2004 Location: Colorado USA	I suspect that by "bipolar" you mean a non-polarized cap, like a film cap without "+" and "-" terminals. Yes, you can use a non-polarized cap.

11th February 2006, 05:47 PM	#6
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	If chassis permits also consider a polyprop and oil motor run cap. Relatively cheap and excellent quality: http://cgi.ebay.ca/100-uF-Oil-Run-Ca...QQcmdZViewItem If you decide on this route and it's important to you, this version of ASC sold by the above E-bay dealer has non-magnetic electrode terminals. The terminals of the domestic ASCs I bought from Digikey are strongly magnetic.

15th February 2006, 01:46 AM	#10
refference diyAudio Member Join Date: Jan 2006 Location: SAO PAULO - SP	Hi andy2 , I saw the schematic diagram of your amplifier , and the value of cathode by-pass caps of output tubes is absolutely correct . You can try another brand to see if it results in the sound's improvement . but don't try to change the rating ( uf and WVDC ) . Try to use brands like Nichicon , Nipon Chemical , etc. Regards Carlos

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