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Old 27th August 2012, 10:27 AM   #1
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Default morgan Jones HT caps & Anode Loads

If I am not wrong,the great Morgan Jones, who I have read from back to front and back again several times espouses "Polypropylene HT Capacitors and Wire Wound Aluminum Cased Anode Loads", in his EL84 amplifiers (my favorites)
I have a deep respect for MJ but rocking horse poo looks common compared to the above. I have only the entire WWW to look in but i cant find either in the values that would seem desired for the stated purpose. What gives
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Old 27th August 2012, 11:56 AM   #2
SY is offline SY  United States
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Don't know about Oz, but here in the US, they're common as can be- standard and inexpensive items at places like Mouser and Digikey.
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Old 27th August 2012, 01:55 PM   #3
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Polypropylene caps are common everywhere - just look for motor run. Not motor start by the way.

Wirewound resistors sound great. I prefer the sound of the vitreous enamel types e.g. Welwyn green types to the aluminium clad ones. Depends on the wattage, but I'd avoid aluminium clad if I had an alternative.
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Old 27th August 2012, 04:25 PM   #4
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Aluminum clad are OK as bypassed cathode resistors and in power supplies, but as has been suggested perhaps best avoided in the audio path proper. I like both Mills non-inductive types and the green Welwyns mentioned.
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Old 27th August 2012, 04:51 PM   #5
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My vote for the capacitors. Save the motor runs for when you need high capacitance values. For that first small cap after the rectifier, or the ones he recommends around DC chokes, these can't be beat. They are shown in stock at Mouser's Australian store.

http://www.cde.com/catalogs/940C.pdf
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Old 28th August 2012, 05:05 PM   #6
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Quote:
Originally Posted by kevinkr View Post
Aluminum clad are OK as bypassed cathode resistors and in power supplies, but as has been suggested perhaps best avoided in the audio path proper. I like both Mills non-inductive types and the green Welwyns mentioned.
So, a cathode resistor in not in the audio path?
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Old 28th August 2012, 05:18 PM   #7
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by costis_n View Post
So, a cathode resistor in not in the audio path?
Note the operative word "bypassed" The AC signal current in this instance flows through the bypass capacitor until Xc is appreciable compared to the cathode resistor.

Note I'm more than likely to use fixed bias in a situation where this sort of cathode bias resistor might be used.
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