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November 26, 2021, 03:51:46 PM

Author Topic: Eros 2 questions [resolved]  (Read 1458 times)

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Offline Paul Birkeland

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Re: Eros 2 questions
« Reply #15 on: September 11, 2021, 12:19:02 PM »
If you play a record, is this noise super present?  If you cable up an Eros to a turntable and crack your preamp up all the way, you'd probably hear some hum, but you'd never listen at this level, so it's a good idea to be sure that isn't what's going on.

Beyond that, the Rega TTs send the earth connection down one of the RCA cables and combine it with signal ground.  This should work just fine with the Eros and only will cause potential problems with a moving coil cartridge and step-up transformers. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline tmills

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Re: Eros 2 questions
« Reply #16 on: September 11, 2021, 12:31:07 PM »
I can't play a record because the hum is super present. That is all you hear. It isn't noise or a hiss. It is 60hz hum and the more level I give the preamp the louder it gets. This is disappointing. I will figure it out. I have been working all day on it and I think I need to just walk away for a bit.

Thanks for your help'

Offline Paul Birkeland

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Re: Eros 2 questions
« Reply #17 on: September 11, 2021, 01:40:22 PM »
Yes, I would take a break. If you have a phone with a headphone jack, you can turn the phone all the way down, then up one click, then use that to feed signal into the Eros to be sure it's all working properly.

Hum issues like this are grounding related, and they are generally pretty simple but they can be tough to find. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline tmills

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Re: Eros 2 questions
« Reply #18 on: September 11, 2021, 01:48:01 PM »
I played a record again just to see what would happen. It turns out that the hum is in the right channel only. The left channel is fine. It was just so loud I assumed it was coming from both channels. I will retest tomorrow and check all wiring in the right channel.
I would think it would be on the input side since there is no hum when the input is not connected. It sounded good on the left channel although I couldn't turn it up very loud.

Offline Paul Birkeland

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Re: Eros 2 questions
« Reply #19 on: September 11, 2021, 02:32:01 PM »
What happens with the Eros if you only have the left channel plugged in from the TT?
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline tmills

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Re: Eros 2 questions
« Reply #20 on: September 12, 2021, 12:28:16 PM »
If I just have the left channel hooked up the Eros plays fine on the left channel with no hum. I switched tubes to see if I had a bad tube. I don't. I will just have to go through all the wiring on the right channel to find the source of the hum. I will have to wait until next weekend to sort this out.

Thanks again for your help Paul.

Offline Paul Birkeland

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Re: Eros 2 questions
« Reply #21 on: September 12, 2021, 01:42:47 PM »
How about if you plug just the left RCA into the right channel?
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline tmills

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Re: Eros 2 questions
« Reply #22 on: September 19, 2021, 01:28:20 PM »
After a lengthy inspection, I found another loose connection. That is two newbie mistakes. Now the Eros is firing on all cylinders and it sounds amazing!!!
It will just get better as it runs in and those big Mundorf Supreme silver/oil caps burn in.
Thank you Paul for all your help. This is a solid bit of kit but it takes some time and patience to avoid the mistakes that I made.


Todd

Offline Paul Birkeland

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Re: Eros 2 questions
« Reply #23 on: September 19, 2021, 01:37:43 PM »
Waiting a day or two and having a second look is a very good way to approach these kinds of problems.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline tmills

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Re: Eros 2 questions [resolved]
« Reply #24 on: October 03, 2021, 06:16:40 AM »
Here are some pics of the unit. It sounds really good and will only get better as the caps burn in. The finish is straight out of the videos with black hammertone and high gloss clear coat on the alder. The mods were the resistors suggested by Paul and the Mundorf 1.5uf Mcap Supreme Silver and oil caps which just fit. The leads on the Mundorfs were too thick so I had to solder them on the upper tab instead of the lower tab. Other than that it is pretty much straight from the manual.

Offline tmills

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Re: Eros 2 questions [resolved]
« Reply #25 on: October 03, 2021, 11:20:11 AM »
Just put together the Bottlehead power cord kit. My Eros is still burning in but the new power cord seems to make certain things a little clearer. Especially drum hits, cymbals etc.
Nice cord. Recommended.