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Old 25th June 2005, 04:50 AM   #1
kmtang is offline kmtang  Canada
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Default Power supply for Single Ended Amplifier

I tried to use different types of capacitors in the power supply for the Single Ended Amplifers that I built. I noticed that the capacitors used and different circuitry would have different results.

With use of Black Gate electrolytic, Solen polypropylene, ASC oil capacitors, they would result with different sound characteristics. I still have not come up decision which one is the best. I believe it is just fun to try them all.

Johnny
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Old 25th June 2005, 06:11 AM   #2
karma is offline karma  Canada
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yes i have noticed the same still playing around with mine
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Old 25th June 2005, 03:01 PM   #3
jlsem is offline jlsem  United States
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Quote:
I tried to use different types of capacitors in the power supply for the Single Ended Amplifers that I built. I noticed that the capacitors used and different circuitry would have different results.
The last capacitor before the output transformer is the most critical in a single ended amp. Unlike in a push-pull amp, it is directly in the signal path (the AC return path). I use a smallish (8 - 10uF) cap of the highest quality in this position. You can get away with a small value if you use an LCLC power supply.

John
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Old 25th June 2005, 06:20 PM   #4
Sherman is offline Sherman  United States
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I recently used ASC caps around an 8H choke in the PS of my SE monoblocks. They have been excellent with virtually no ripple on the HT. I haven't tried low priced electrolytics but Blackgates are outstanding also. The ASC caps were less expensive though much larger.

I'm working on the design of a new SE EL84 amp (not monoblocks this time) and am leaning toward ASC caps again.
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Old 25th June 2005, 06:48 PM   #5
sklimek is offline sklimek  United States
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Hi, I'm starting a 300B as well. It took awhile to try and figure Duncans PSUD but I think I am starting to get a handle on it. The one thing I discovered in my practise was the a double choke showed an substantial smoothing of the ripple when I compared it to a CLCLC configueration. I attached the file of both CLCLC and CLC configuerations if anyone would like to put keen eye on them and make some reccomendations. The zips are .psd files for Duncan PSUD2 Freeware.

http://www.duncanamps.com/psud2/index.html



Stan
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File Type: zip clclc.zip (262 Bytes, 54 views)
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Old 25th June 2005, 06:49 PM   #6
sklimek is offline sklimek  United States
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Here is the CLC zip.
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File Type: zip clc.zip (253 Bytes, 38 views)
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Old 25th June 2005, 08:30 PM   #7
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Speaking from my own experience I've found that haing the second LC stage in the PSU makes a big difference.My latest SE2A3 has a CLCLC for the output stage followed by an LC stage and shunt regulator(half a 6SN7)for each of the 6SN7 input tubes.The sound is incredibly clean and detailed.DC heaters for the 6SN7's and AC for the 2A3's.Hum on the output is 1.7mV per channel.I also use big (60uF) ASC oil caps in my HT supplies.
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Old 25th June 2005, 08:31 PM   #8
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The chokes for the output stage are under the chassis.Split rail HT supplies throughout as is my preamp.
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Old 25th June 2005, 08:49 PM   #9
sklimek is offline sklimek  United States
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I added PSUD2 screenshots at 6X magnification on the driver tube from both simulations in a 'Word' file. I hope it opens... I'm wondering if this smoother ripple in the CLCLC will have an advantage or it is just a point of diminishing return...

Stan
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File Type: zip 6xclclc.zip (53.8 KB, 35 views)
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Old 25th June 2005, 08:50 PM   #10
sklimek is offline sklimek  United States
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And the CLC...
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File Type: zip 6xclc.zip (53.6 KB, 16 views)
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