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Old 9th October 2004, 04:17 PM   #1
james_b is offline james_b  United States
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Question Best place to use 2 Jupiter Bee caps in tube amp?

Which would be a better place to utilize 2 Jupiter Beeswax capacitors in a tube amp?

Choice one: one each in the location between the right & left
RCA inputs and the dual volume control,

or choice two: one each between the plate of the driver tube and the grid of the output tube.

This is in a 4 tube pushpull pentode amp. Thanks for your opinions.
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Old 9th October 2004, 05:10 PM   #2
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Default Re: Best place to use 2 Jupiter Bee caps in tube amp?

Quote:
Originally posted by james_b
Which would be a better place to utilize 2 Jupiter Beeswax capacitors in a tube amp?

Choice one: one each in the location between the right & left
RCA inputs and the dual volume control,

or choice two: one each between the plate of the driver tube and the grid of the output tube.

This is in a 4 tube pushpull pentode amp. Thanks for your opinions.

James,
I'll go for 2nd option,because if you don't have DC at the output of your previous stage you can ommit input cap.Especially if you use attn. rather than pot!
Regards,
Yugovitz
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Old 10th October 2004, 01:02 AM   #3
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Hmmm...sounds expensive and dubious (think of all those leaky wax caps from old radios......). I say #3, e-Bay 'em for some 715P's.

Tim
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Old 10th October 2004, 04:20 AM   #4
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I'm with Tim. Ebay those snake oil capacitors. If you absolutely HAVE to use them. Put 'em in the input circuit so that when they fail they won't degrade the circuit or cause catastrophic damage.
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Old 10th October 2004, 07:09 AM   #5
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Quote:
Ebay those snake oil capacitors
Not so fast. These caps contain harmful substances (snake oils)that need to be disposed of in responsible manner. I am willing to do this for free as i already have experience with this vile brand. Pls send a pvt mail to arrange collection.

If you still feel brave to use them keep in mind their transparency is highly addictive and likely to cause long term dent in your audio budget.
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Old 10th October 2004, 06:00 PM   #6
james_b is offline james_b  United States
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Default caps

Its easy to ignore dimwits who post negative comments about a product they have no experience with, you know what they say about opinions (of the uninformed). Personally I have in the past upgraded to Jensen PIO caps and they were a definite improvement, so I am looking forward to trying the Jupiters.
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Old 10th October 2004, 08:51 PM   #7
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Default Leaky wax caps!

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Originally posted by Sch3mat1c
Hmmm...sounds expensive and dubious (think of all those leaky wax caps from old radios......). I say #3, e-Bay 'em for some 715P's.

Tim

It is interesting that many people claim wax caps(along with oil caps) can be leaky after long time of exploatation.How it is possible when,as far as I know,beeswax has dielectric constant close to that of PTFE!?

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Old 10th October 2004, 09:39 PM   #8
kevinkr is offline kevinkr  United States
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I haven't tried the jupiters myself yet, but I have listened to an amplifier that used them, and I will say it was a pretty darn good sounding amplifier. I have been using the Jensen copper pio caps for some years now and haven't seen one fail yet. I think the Jupiters are worth trying, and bear in mind that all those "unreliable" wax/paper caps were usually decades old in most cases by the time they failed. Modern electrolytics often don't do a whole lot better... Just be careful not to overheat the leads when installing, and check dc leakage after installation.
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Old 10th October 2004, 10:53 PM   #9
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The prob with the Jupiters is they appear to be very temperature sensitive and will become leaky if exposed to high temp over extended period of time. I have always been careful and never had a problem but realise that with a new brand, obviously not following the traditional technologies, long term reliabilty is unknown and probably much inferior than film types. The Jensen/Audionote seem to show a lot of reliabily problems after 5-6 years of use.

So, if you would like to treat your caps as a long term investment, buying russian teflons is probably a smarter move - no doubt they were designed to withstand atomic blast temperatures
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Old 10th October 2004, 11:42 PM   #10
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Default Re: Leaky wax caps!

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Originally posted by Yugo
It is interesting that many people claim wax caps(along with oil caps) can be leaky after long time of exploatation.How it is possible when,as far as I know,beeswax has dielectric constant close to that of PTFE!?
Ok, so WTH does K have to do with anything? Is glass then as bad as an electrolytic, simply because their K's are similar?

You sir clearly know nothing about capacitive materials.

Tim
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