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Old 13th May 2012, 02:04 PM   #1
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Default Darling 1626

I know that changing coupling caps can make/break the sound. What resistors/caps can i upgrade to improve the sound on this circuit. Thanks.
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Old 13th May 2012, 04:41 PM   #2
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It's a simple circuit, just use Solen or Orangedrops for C1 and 2, and Nichicon Muse for C3 - C6. Tom has made many, you can see what he used at Tom McNally's Amps
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Old 13th May 2012, 04:59 PM   #3
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replace C1 and C2 with 1Uf 630V Solen or 1uf 400V Musicap. Stay away from Wima's.

Heater supply is very important to adress. take the heater supply, do not directly ground it. instead, take a .1uf cap and go from heater ground to dc ground. never use a laptop power supply as this will induce its noise on the heater which in turn will be amplified in all tube stages. I never really use the dc heater method other than circuits that are battery powered. of course it wouldn't be hard to make a charging circuit for a battery then the unit is off and then run the heaters off of a battery.
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Old 13th May 2012, 05:33 PM   #4
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Heater circuits should always have a DC reference. Nothing inside a valve envelope should be left floating. Why do you keep peddling this wrong idea in so many threads?
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Old 13th May 2012, 05:59 PM   #5
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they dont need dc reference, just AC, as Rfk is resistance in AC. sometimes DC referencing doesn't work as well
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Old 13th May 2012, 06:48 PM   #6
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Quote:
Originally Posted by DavesNotHere View Post
Stay away from Wima's.
I'm curious, exactly and precisely why?
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Old 13th May 2012, 08:21 PM   #7
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Quote:
Originally Posted by Originally Posted by DavesNotHere:
"Stay away from Wima's."

HollowState;3022023
I'm curious, exactly and precisely why?
I remember years ago using some nice Wima coupling caps I found in a surplus store in a Bogen PP 6V6 amp. It was driving a Stromberg Carlson red cone coax in a 3cu ft box using a Sherwood tuner as source. I was listening to a live broadcast on PBS in San Diego and was just stunned by the sound in my living room through this mono setup.

It was like being on stage at the event, with the sound of footsteps on the stage and the slight hum from an amp; people chatting offstage and a guitar being tuned. When the music started it was just like like live. Sometimes all the stars align and the electrons are all spinning together and the sound is real on even the most humble sound system.
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Old 13th May 2012, 09:44 PM   #8
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The 10uf wimas I have all sound very nice - a tad rolled off on the top end - but absolutely nothing nasty.

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Old 14th May 2012, 12:31 PM   #9
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I myself love wima, especially the least expensive mks type - i use them wherever i can.
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Old 14th May 2012, 10:03 PM   #10
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Originally Posted by HollowState View Post
I'm curious, exactly and precisely why?
Personal preference. He just didn't like 'em. Others probably won't agree. Personal preferences vary widely, and there will be very little consensus as to which are the best components, topologies, VT types, etc, etc, etc.
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