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January 21, 2020, 04:17:45 PM

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11
Crack-a-two-a / Re: Possible Channel Imbalance
« Last post by XforceVesa2 on Today at 10:52:44 AM »
I would measure this next Time.

Should I check all Solder joints in the Amp or only these near the Input and Power Tube?

During the Build I've checked almost all Solder Joint with my eyes and my multimeter(checked the connections from one solder joint to another with the Impedance check that its always shows 0.00 Ohms).

In the Input socket both leds are lit bright if the amp is On, only on the Larger PC Board I've noticed that the Leds on it doesn't lit so brightly like the Others Leds did.
12
BeePre / Re: Attenuators at output instead of input?
« Last post by Paul Birkeland on Today at 10:02:45 AM »
You could do that.  In order to do it properly, you would have to do a lot of head scratching to prevent overdriving the inputs as well as what impedance of attenuator you'd want to use at the outputs to be able to drive cables without making the circuit distort from poor loading.  It's a very complicated question!
13
Reduction / Re: Dropped my Reduction :(
« Last post by Paul Birkeland on Today at 10:01:10 AM »
Integration changes the voltages at 4 and 29 (that's the high voltage regulator at work).

The lower voltages at the other terminals reflect some extra current being drawn by the Integration to perform the regulation.
14
BeePre / Attenuators at output instead of input?
« Last post by Deke609 on Today at 09:10:00 AM »
Apologies if this idea is completely stupid and a no-go, but could there be any SNR benefit to putting the Beepre attenuators after amplification (after the 300Bs), instead of before?  I ask only out of curiousity. I'm not trying to troubleshoot anything (my former hum problem has disappeared on its own and the Beepre rebuild prototype with the giant copper foil caps sounds superb).

MTIA, Derek
15
Reduction / Re: Dropped my Reduction :(
« Last post by Mesz77 on Today at 06:55:37 AM »
That's very good news to hear! I just want to double check though because some of the voltages are off from the manual:

Terminals 4 and 29 are around 108V but it says it should be around 145-155V
And Terminals 50,51,56,57,59,60 are all about 10V lower than the manual says


16
Reduction / Re: Dropped my Reduction :(
« Last post by Paul Birkeland on Today at 05:02:52 AM »
So it looks like you've resolved your issue.
17
Crack-a-two-a / Re: Possible Channel Imbalance
« Last post by Paul Birkeland on Today at 05:01:34 AM »
When the 12AU7 has amplified the signal, there is DC in the presence of the AC voltage.  You could try measuring the AC voltage at pins 1 and 4 on the octal socket, but your meter may not resolve the AC on top of the DC all that well.
18
Eros Phono / Re: Warming up Eros sound signature
« Last post by maryc27182 on Today at 04:21:23 AM »
Aaron, those are the Solen S3Q, right? I'm pretty sure I read a post of yours back in 2017, then followed your lead, and put those in my Eros.

As for tubes, I'm currently running the G.E.C. CV4085 and Amperex 7308. I had to do some shopping around to find the G.E.C. at a not-insane price (but they were still way more expensive than the Russian EF86, which are very good, imo.)

Mary
19
Eros Phono / Re: Warming up Eros sound signature
« Last post by DesignTaylor on Today at 04:17:09 AM »
@Deluk - Wise words indeed. With any new tweak to my system, I always take the time to do some listening test comparing before and after. As you noted, not every new addition works out (even if it is good on paper AND you are really excited about it). Sometimes the best move it to return it or sell it on to someone else. In this case, I'm excited by the newfound detail and clarity that the cart and SUT are extracting. Just a matter of balancing it back out.

@johnsonad - Thanks for the capacitor tips! Always helpful to hear where people have ended up with their own configurations.
20
Eros Phono / Re: Warming up Eros sound signature
« Last post by johnsonad on Today at 03:31:09 AM »
The only capacitors that you can adjust are the output. Try some paper in oil and then try Teflon film and foil. Between these and the tubes you should be able to find a combo that works well for your taste.

I use a pressed plate Amperex Bugle Boy 6922 and Tele EF86’s with Teflon film and foil outputs.
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