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Old 20th September 2012, 02:06 PM   #7351
Joachim Gerhard is offline Joachim Gerhard  Germany
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Here are new teflon caps. They are for high voltage and 2000pF is the highest value.
I assume they are expensive.Fixed Capacitors - Non-Magnetic from Polyflon Company - a Crane Co. Company
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Old 20th September 2012, 03:14 PM   #7352
Joachim Gerhard is offline Joachim Gerhard  Germany
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Here are alternative transformers to the Selectronic R-Core from Hammond. They are spit bobbin and specked for low capacitive coupling. I can get them more easy from Digikey and they are economical priced. What do you think ?
http://www.hammondmfg.com/pdf/5c0013.pdf
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Old 20th September 2012, 03:18 PM   #7353
Joachim Gerhard is offline Joachim Gerhard  Germany
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This one is good :229C56 Hammond Manufacturing | 229C56-ND | DigiKey
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Old 20th September 2012, 03:40 PM   #7354
Joachim Gerhard is offline Joachim Gerhard  Germany
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I have ordered Hammond 229C56 but they are not in stock so i have to wait a bit.
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Old 20th September 2012, 04:25 PM   #7355
oncle_tom is offline oncle_tom  Germany
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Hi Joachim,

do you know this site?
http://www.selectronic-kondensatoren...n_audiocap.pdf

Peter
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Old 20th September 2012, 04:28 PM   #7356
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
I like it
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Old 20th September 2012, 05:22 PM   #7357
Joachim Gerhard is offline Joachim Gerhard  Germany
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Yes, i know the Gad-Vida. I called up Selectronic and they said that they made this caps for a customer in Hongkong and do not have them in stock. I called the guy in Hongkong and he was out of stock too.
I have my own preference in caps. Between my preamp and power amp i have a cap in line that filters with 6dB octave under 80Hz because i do the bass active. I can bypass that cap when i do not play the system so loud that my midranges bottom. I can simply not hear if the cap is in line or not. With the cap inserted the system just plays louder because it is relieved somewhat from the lowest frequencies. I do not say that caps do not matter at that place but i found a combination that is under my auditory threshold and it is not an expensive boutique cap. It is a combination of MKP´s shunted with a small value low inductance Styroflex. Both from well known, major manufacturers and economic priced.
Thanks Frans, yes, that trafo is a good choice.
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Old 20th September 2012, 07:58 PM   #7358
Joachim Gerhard is offline Joachim Gerhard  Germany
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The transformers are delayed until december, sorry.
I will use Block transformers for the prototype so that i can cary on.
Later the Hammonds can be fitted and i will listen if they make any difference.
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File Type: png Transformer delivery.png (33.7 KB, 280 views)
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Old 20th September 2012, 08:27 PM   #7359
le´flu is offline le´flu  Germany
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Joachim,
would you please be so kind and disclose the secret which MKP and
Styroflex you use als coupling cap?
Could you also give a hint, what cap / combination you recommend
just before the tweeter in speakers?

Greetings ulf
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Old 20th September 2012, 09:09 PM   #7360
Joachim Gerhard is offline Joachim Gerhard  Germany
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You have to find out yourself. Sorry, no spoon feeding. You find it on this thread somewhere. It is not a secret, just a lot of listening and measurements. One Tip : the rule to bypass the main cap with a cap that is 1/10nth the value does not work. The bypass cap is much smaller.
Study the spec sheet and look where the main cap has it´s minimum impedance and blend in the bypass where the main cap starts to be inductive.
For speakers it it different because of the high currents that flow and the immense shaking. What matters most here is to suppress mechanical resonances.
A densely wound MKT can sound better then a teflon cap with loose windings.
Dielectric absorption is a minor problem in speakers because the cap can not build up much energy. The low impedance of the speaker short circuits the cap mostly all of the time.
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