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Kerry

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Posts posted by Kerry

  8. goldenreference high voltage power supply (GRHV)

    in Do It Yourself

    Posted

    Sounds good. 

    For the first test (10M90S / DN2540), I run these with a little less current these days (you don't need to).  I don't have the schematic for this board in front of me, but I thought the set resistor for this was around 3K.  Is that R1?

    On the second test, you could also put the (-) on ground and then check the voltage at pin 6 of the reference from ground to pin 6.  As long as the voltage reference is in the right orientation and functioning, this will work.  I don't do this test unless it's not regulating (low voltage test above).  That being said, if the reference is in backwards, things will pop.

  9. goldenreference high voltage power supply (GRHV)

    in Do It Yourself

    Posted

    If you want to test at full load for the Carbon, it would be around 6K at the full 450V.  I would parallel at least two resistors and mount them on a nice big heat sink...

    Here's a test load I use for the T2 supplies.  

    20220319_203000156_iOS.thumb.jpg.12a101a0efb268d43ba8bdb95f217e73.jpg

    Even with a very large heatsink it will get hot pretty fast.  You can certainly test with less current (recommended), which should expose any issues with the power supply.  

    Also, I agree with James on testing first with low voltage.  I typically do 30V - 60V on the input of the HV supply and then put a temporary resistor across the set string (excluding the first 20K or 14K resistor - depending on the vref used).  This way you know the power supply is regulating (figure on about 15V - 20V of dropout in order to regulate).  After that, it's unlikely that there will be any issues.

    Good luck :) 

    • Like 2

  16. Kerry's got a new Co... Eksonic

    in Headphone Amplification

    Posted · Edited by Kerry

    Some people have been asking for specs on the Aeras, so here they are...

    • Input: XLR – Accepts balanced or single-ended (with grounded RCA to XLR cable)
    • Input Impedance: 50K x2
    • Gain: 1000x
    • Frequency Response: 1Hz – 60KHz
    • Max P-P Voltage: 1500VAC
    • Max RMS Voltage: 1000VAC
    • Output: Stax Pro-Bias x1
    • Vacuum Tubes: 6S4A x4
    • Power Consumption: 100W
    • External Dimensions: 19 cm x 34.3 cm x 14.2 cm (7.5” x 13.5” x 5.6”) – W x D x H
    • Weight: 5.5 Kg (12 lbs)
    • Mains AC: 115/230VAC Switchable
    • Like 11
    • Thanks 2
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