Amp Build: Ceriatone Kraken 50

Discussion in 'Building the Classics' started by FourT6and2, Jun 25, 2017.

  1. FourT6and2

    FourT6and2 Active Member

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    From ValveWizard
     
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  2. FourT6and2

    FourT6and2 Active Member

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    It's time for everybody's favorite part of building an amp—heaters!

    JK, it's the worst.

    Decided to run DC on V1 and V2; regular AC on V3-V6.

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  3. jensvonbustenskjol

    jensvonbustenskjol Active Member

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  4. neikeel

    neikeel Well-Known Member

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    Looking great, but I only see 3 preamp and 2 power valves - where is V6?
     
  5. FourT6and2

    FourT6and2 Active Member

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    It's a ghost valve
     
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  6. maxxi

    maxxi Active Member

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    very clean work :agreed:
     
  7. FourT6and2

    FourT6and2 Active Member

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    More progress today. Finished up the power section and did the power tube sockets, bias test points, impedance switch, and a few other things here and there.

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  8. Ghostman

    Ghostman Well-Known Member

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    That is one clean looking build. Pure circuit porn. Nicely done.
     
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  9. FourT6and2

    FourT6and2 Active Member

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    A bit more today. Having routed a bunch of stuff now, I'm making some notes about how to do it better the next time around. And by better, I mean more OCD lol.

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  10. FourT6and2

    FourT6and2 Active Member

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    Preamp tubes all done. In the home stretch now.

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  11. FourT6and2

    FourT6and2 Active Member

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    All done!

    Just doing some testing now. I'm using a 47K 5W pot wired as a variable dropping resistor. This way, I just clip it to the filter cap and I can tune all the voltages in the amp. Typical value is 10K. I set it to 18K, which is what the Yeti uses (higher voltages). And my B+ is a whopping 515vdc! That's without power tubes though. Once I stick some in, it'll probably come down a bit. I don't really have a set goal in mind. But I'll play it with a few of the resistor values I have on hand and figure out which one to use.

    I also got some new Tefzel hookup wire in some fancy colors for the next build. And I'm going to try to make the lead dress a little better next time around. I wanted to get this one done so I can start testing a few things first, tone wise.

    Current voltages with no power tubes and 18K dropping resistor:

    MAINS: 124.4VAC
    AC FILAMENTS: 3.47VAC
    DC FILAMENTS: 6.09VDC
    BIAS/PI SPLITTERS: -50 to -36VDC
    PT SECONDARY: 375VAC

    V1:
    1: 151VDC
    2: SIGNAL
    3: 1.47VDC
    4: FILAMENT
    5: FILAMENT
    6: 274VDC
    7: SIGNAL
    8: 2.47VDC
    9: FILAMENT

    V2:
    1: 226.1VDC
    2: SIGNAL
    3: 1.26VDC
    4: FILAMENT
    5: FILAMENT
    6: 381.5VDC
    7: 226.1
    8: 228VDC
    9: FILAMENT

    V3:
    1: 257.3VDC
    2: 26.2VDC
    3: 42.24VDC
    4: FILAMENT
    5: FILAMENT
    6: 245.2VDC
    7: 27.6VDC
    8: 42.24VDC
    9: FILAMENT

    V4/V5:
    1: 0
    2: FILAMENT
    3: 511VDC - 515VDC
    4: 509VDC
    5: -50VDC
    6: 509VDC
    7: FILAMENT
    8: 0

    B+: 515VDC
    SECOND CAP AFTER DROPPER (18K): 381VDC
    BOARD CAP AFTER DROPPER: 366.8VDC
    V1a: 151.7VDC
    V1b: 274VDC

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  12. wakjob

    wakjob Well-Known Member

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    Man, that turned out great.
    Can't wait to hear your thoughts after final tuning.

    What kind of wire is that, and where did you get it?

    I'm fixing to redo my 5e3 with a turret-board and some mods, and I don't think I'm gonna use the original cloth covered wire this time.
     
  13. FourT6and2

    FourT6and2 Active Member

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    Here's a clip. This is with a 10K dropping resistor. Probably my favorite value so far. The volume is as loud as I can get it without clipping the mic on my laptop, sorry lol. I'm working to upload the other clips with different voltages too. But it takes a long time for YT to process 'em. I'm still toying with a few parts here and there.

     
  14. jensvonbustenskjol

    jensvonbustenskjol Active Member

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    Nice tone!
    Black dog is such a rich song. Nailed very well :)
     
  15. FourT6and2

    FourT6and2 Active Member

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    I just love that rhythm riff lol. I always use it to test an amp, even high-gain ones.
     
  16. FourT6and2

    FourT6and2 Active Member

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    Some cleans-ish

     
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  17. Marshee

    Marshee New Member

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    I'm amazed
     
  18. ampmadscientist

    ampmadscientist Well-Known Member

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    In your bathtub.
    If you change the filament wire layout....there is no need for DC heaters.

    It is possible to get 100% of the noise out by re- positioning the filament wires.

    B+ voltage:
    Means nothing with the tubes out. There is no load on the power supply.

    The more the supply is loaded: the lower the voltage will drop.

    Bias setting: will literally control the B+ voltage.
    The hotter the bias is...the lower the B+ will drop.....because the B+ is loaded more.
     
    Last edited: Sep 17, 2017

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