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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 14th March 2017, 10:54 PM   #11
waltroman is offline waltroman  United States
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Quote:
Originally Posted by Osvaldo de Banfield View Post
I don't find any relation between two facts. Output transformers doesn't give any heaters supply. Noise is electrical or acoustic?

Also, 10% variation in heater's voltage is tolerable.
I believe the noise to be electrical. The reason for mentioning the voltage on the 6.3 volt tap was that is seemed higher than when I first checked it.

So I am left with 2 issues. the voltage I believe I can fix with a higher ohm rated resistor on C3.
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Old 15th March 2017, 01:26 AM   #12
waltroman is offline waltroman  United States
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I found this thread and am interested in the 2.2uF caps for the output transformer. Can someone verify the B+ tap for the output transformer. I believe they are T3-2 and T2-2
click to follow down to #5

TSE buzz and PSU
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Old 15th March 2017, 02:45 PM   #13
mkane77g is offline mkane77g  United States
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Noise at output transformers
post #6

terminal input/output for SE Board

Last edited by mkane77g; 15th March 2017 at 02:49 PM.
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Old 15th March 2017, 03:00 PM   #14
waltroman is offline waltroman  United States
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Thanks for the help but that is the power transformer not output transformer.
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Old 15th March 2017, 03:13 PM   #15
mkane77g is offline mkane77g  United States
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Noise at output transformers
Then you have it correct in your post #12. Don't think it makes a difference if it's T3-2/T2-2 or the other way around. The difference I have noticed is the soundstage, the way it's presented. One way it's a real centered image. The other way the image is more right left or way outside of speaker placement and my preference. sort of 3D if you will.
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Old 15th March 2017, 04:00 PM   #16
waltroman is offline waltroman  United States
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I am a little confused. T2 and T3 are the two output transformers. The output transformers fit between the 10 ohm resistor on one side and the plate of the 45 tube on the other. Do I understand you correctly saying installing the 2.2uF cap in either position to ground will change the soundstage dimension?

If so what would give the large soundstage?

Thank for the reply.
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Old 15th March 2017, 08:42 PM   #17
mkane77g is offline mkane77g  United States
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Noise at output transformers
No. Your post, #12 asking to verify B+ tap is all I am alluding to.
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Old 16th March 2017, 01:52 AM   #18
waltroman is offline waltroman  United States
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Got it, either side of output transformer is OK just different presentation.
Are you doing this to get rid of noise?
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Old 16th March 2017, 02:18 AM   #19
mkane77g is offline mkane77g  United States
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Noise at output transformers
I have no noise.
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Old 28th March 2017, 12:14 AM   #20
waltroman is offline waltroman  United States
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A friend with a scope found cold solder joint on C1. Amp runs dead Quiet now!
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