Smashup Voltage [resolved]

1026mind · 140004

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Offline 1026mind

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Reply #15 on: February 19, 2022, 08:36:05 AM
OB to +reg to Breg
-reg to bA
so if I disconnect the power source and measure voltage at !50V L and !50V R I get 212V, after I connect to the rest I get 107.5 and 208.5?????
I really appreciate your help


Offline Paul Birkeland

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Reply #16 on: February 19, 2022, 09:03:27 AM
The presence of a high Kreg voltage on one side of the regulator suggests that side should work.  The low Kreg on the other regulator suggest that side would not.

Do your jumpers leaving OB go to Breg and +Reg on the B side or the A side?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline 1026mind

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Reply #17 on: February 19, 2022, 09:19:19 AM
The Ob jumpers where wrong, they where going from left side to right, rewired and the voltages are in line now.
THANK YOU VERY MUCH!!!


Offline 1026mind

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Reply #18 on: February 19, 2022, 12:25:38 PM
So it's working but is still very noisy. (:


Offline Paul Birkeland

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Reply #19 on: February 19, 2022, 12:56:14 PM
What kind of noise?

Paul "PB" Birkeland

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Offline 1026mind

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Reply #20 on: February 19, 2022, 01:49:16 PM
floor noise


Offline Paul Birkeland

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Reply #21 on: February 19, 2022, 01:56:40 PM
What amplifier are you using and what speakers are you using? (or alternatively how much gain does your power amp have any how sensitive are your speakers?)

Paul "PB" Birkeland

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Offline 1026mind

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Reply #22 on: February 19, 2022, 02:01:34 PM
Cambridge Audio 851N one per channel and Klipsch La Scala clones that I build.


Offline Paul Birkeland

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Reply #23 on: February 19, 2022, 02:22:41 PM
Yeah, I figured you either had a ton of amplifier gain (20+dB) or highly sensitive speakers, and you have both!  I would use some Harrison Labs -12dB attenuators at the input of each amplifier to reduce sensitivity a bit, or consider a lower gain/lower power amplifier.

Paul "PB" Birkeland

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Offline 1026mind

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Reply #24 on: February 19, 2022, 02:40:30 PM
Long time ago I purchased the last two suductor amps kits that you sold, would this work along with a Thorens turntable and the Eros that I build already?
t


Offline Paul Birkeland

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Reply #25 on: February 19, 2022, 02:54:42 PM
The Seductor will knock the noise down by about 12dB.  You may prefer the Seductor and some -12dB attenuators to really knock things down. 


Paul "PB" Birkeland

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Offline 1026mind

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Reply #26 on: February 19, 2022, 03:33:42 PM
Got it, parts express have the atenuators they are 12db not -12db


Offline 1026mind

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Reply #27 on: February 22, 2022, 06:54:00 AM
I went from 2 amps to 1 and the noise went down a little but I noticed that there is noise even without the smash powered up. its that normal?


Offline Paul Birkeland

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Reply #28 on: February 22, 2022, 08:26:44 AM
That is a bit abnormal.  You could try this mod:

https://forum.bottlehead.com/index.php?topic=11676.0


Paul "PB" Birkeland

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Offline 1026mind

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Reply #29 on: February 22, 2022, 11:01:57 AM
Huge improvement, about 75% of the noise gone, the La Scala's really came to life!!!
Thank you very much!


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