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Old 11th February 2006, 04:55 AM   #1
andy2 is offline andy2  United States
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Default Need recommendation for cathode bypass cap

The current value is 100uf/250V. Could someone recommend a good brand?
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Old 11th February 2006, 07:50 AM   #2
SHiFTY is offline SHiFTY  New Zealand
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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.
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Old 11th February 2006, 08:19 AM   #3
arnoldc is offline arnoldc  Philippines
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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.
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Old 11th February 2006, 02:17 PM   #4
andy2 is offline andy2  United States
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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.
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Old 11th February 2006, 05:18 PM   #5
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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.
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Old 11th February 2006, 05:47 PM   #6
rdf is offline rdf  Canada
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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.
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Old 11th February 2006, 05:54 PM   #7
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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"...
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Old 11th February 2006, 06:10 PM   #8
rdf is offline rdf  Canada
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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)
Attached Images
File Type: png 100 uf asc motor run in ultrapath circuit - noise.png (7.7 KB, 335 views)
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Old 12th February 2006, 07:47 AM   #9
andy2 is offline andy2  United States
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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.
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Old 15th February 2006, 01:46 AM   #10
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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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