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18 whatt - “paint by numbers”

Discussion in 'Shock Brother's DIY Amps' started by RollingBender, Feb 5, 2019.

  1. RollingBender

    RollingBender Tele-Holic Vendor Member

    774
    May 14, 2011
    SW Minnesota
    Warm glow on a very cold night. 72EFBA54-5F8F-4681-B735-EECEC53369C5.jpeg
    At idle, this amp is dead quiet.
     
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  2. RollingBender

    RollingBender Tele-Holic Vendor Member

    774
    May 14, 2011
    SW Minnesota
    Finally got a chance to really run this thing through the paces. I used it Sunday at band rehearsal and was really able to let loose with it a few times since. I absolutely love the normal channel, both clean and wound out. The TMB channel is not getting my love... the lows are farty and it does not have much brilliance either. I ordered all new components for the front panel, maybe that will help. The pots in the recycled chassis don’t seem very healthy.
     
  3. Michael A.

    Michael A. Tele-Afflicted

    Jan 12, 2013
    Virginia Beach, VA
    Wow, you brought an AK-47 to a knife fight!
     
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  4. RollingBender

    RollingBender Tele-Holic Vendor Member

    774
    May 14, 2011
    SW Minnesota
    resistors.jpg

    So, I see grid resistors on some variants of the 18 watt TMB and not on others? Is this contributing to the "darkness" of this amp?
     
  5. Tom Kamphuys

    Tom Kamphuys Tele-Meister

    Age:
    39
    154
    Sep 18, 2018
    The Netherlands
    Depends on their value and I can read almost nothing in the image.

    Post a high res version and I'm willing to do some calculations/simulations.
     
  6. SacDAve

    SacDAve Poster Extraordinaire

    Age:
    67
    Dec 23, 2009
    Rocklin Ca.
  7. RollingBender

    RollingBender Tele-Holic Vendor Member

    774
    May 14, 2011
    SW Minnesota
    They are 10K. I took them out last night so test the difference. I "think" it is a little brighter and I "think" it is a bit noisier without them...hard to tell not being able to A/B them on the fly.

    I've never played through any 18watt variant before so have no frame of reference but a lot of people say that it can sometimes get too ice-pick-esqe, especially with single coils. I've been playing a Strat and Tele through it. On the bridge pickup, it's OK but not as bright as I want. With any other pickup combination, it’s VERY dark sounding and the bass is flabby.
     

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  8. SacDAve

    SacDAve Poster Extraordinaire

    Age:
    67
    Dec 23, 2009
    Rocklin Ca.
    Yeah 10K and people laughed at my clear back panel....... who’s laughing now:twisted:

    18w 2.jpeg 18 w1.jpeg
     
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  9. SacDAve

    SacDAve Poster Extraordinaire

    Age:
    67
    Dec 23, 2009
    Rocklin Ca.
    Interesting to see where this goes. I've never cranked mine up all the way. I always seem to be plugged in channel 2. I'm going to Crank it up monday neighbors are gone
     
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  10. jtcnj

    jtcnj Tele-Meister

    Age:
    54
    488
    Feb 2, 2015
    Brick, N.J. USA
    I mostly use the TMB channel 2 as well.
     
  11. Tom Kamphuys

    Tom Kamphuys Tele-Meister

    Age:
    39
    154
    Sep 18, 2018
    The Netherlands
    Blencowe says 10k is the minimum input resistance that consumer audio gear expect to see. So I guess you should not remove it from the TMB input.

    The high input on the other channel has a cutoff frequency of 20.4kHz with and 23.4kHz without the 10k grid stoppers.

    I believe the low input will have an even higher cutoff frequency.

    However... the 470k grid stopper of the second stage of the TMB gives a cutoff frequency of 3.4kHz.
     
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