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EL84 Amp - Baby Huey
EL84 Amp - Baby Huey
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Old 13th April 2018, 02:47 PM   #2031
e_fortier is offline e_fortier  Canada
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EL84 Amp - Baby Huey
Your feedback terminal is not connected to anything.

Apply your feedback.
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Old 13th April 2018, 03:14 PM   #2032
jcastellano is offline jcastellano  Spain
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EL84 Amp - Baby Huey
Ok.

From speaker output plus to terminal right or left? Or is one side of this terminal tied to ground?

Regards,

Jorge
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Old 13th April 2018, 10:57 PM   #2033
jcastellano is offline jcastellano  Spain
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EL84 Amp - Baby Huey
Default Hum

Hi,

After a successful test, I installed the amp in the main system, with 92dB speakers, but the hum is quite noticeable. I tried to lower the gain with the input pots but it isn’t sufficient. I have connected the ground to only one point and I tried also to no connecting it at all. In both cases behave the same way.

The amp now is very tidy with al cables routed. See photos.

Any clue?

Jorge
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Old 14th April 2018, 12:45 AM   #2034
anatech is offline anatech  Canada
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EL84 Amp - Baby Huey
You do know that your circuit is really close to the transformers - right? Does the hum level drop if you move the PCBs away from the transformers? The power transformer at the very least.

-Chris
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Old 14th April 2018, 06:02 AM   #2035
vgeorge is online now vgeorge  Greece
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EL84 Amp - Baby Huey
You could also try to use a coaxial cable for the input signal.
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Old 14th April 2018, 01:13 PM   #2036
jcastellano is offline jcastellano  Spain
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EL84 Amp - Baby Huey
Thumbs up Ok. I will try

Quote:
Originally Posted by anatech View Post
You do know that your circuit is really close to the transformers - right? Does the hum level drop if you move the PCBs away from the transformers? The power transformer at the very least.

-Chris
Hi Chris,

Thanks for your input. I’m waiting for a new power supply for the heaters, this will give some real estate to move down the amp boards because the little dc-dc power supplies at the bottom will be taken out. As soon as it arrives from France I will install it and make the movements required.

Regards,

Jorge
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Old 19th April 2018, 05:44 PM   #2037
mctavish is offline mctavish  Austria
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Progress! Should be finished by the weekend and then the testing phase...

But I am optimistic!

Outputs are from an AA-100 heathkit, ~7k to 4-8-16 ohm

Power trans are from Sony reel to reel , good quality shielded.

Two Hammond chokes and off we go!
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