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1981 Boogie disassembled - more pics to come

Discussion in 'Amp Input - Normal or Bright' started by StratoMutt, May 13, 2019.

  1. StratoMutt

    StratoMutt Strat-Talker

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    Mark II-B combo, 60 / 100 watt. For you amp heads: reduced resolution to 1280 wide. It is all original including tubes.

    If there is something in particular you'd like to see up close let me know. It is still disassembled. I plan on taking images outside tomorrow for better lighting.

    Hopefully what it looks like (old images) when I'm all finished: https://www.flickr.com/photos/100052744@N02/albums/72157688499146264
     
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  2. Silvercrow

    Silvercrow Senior Stratmaster

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    I'd love to see some general "guts" shots. Curious now that I own one (not that model) how components are mounted, leads to pots and transformers. Whatever you'd be willing to shoot, I'd love to look at! THANKS!

    Brian
     
  3. StratoMutt

    StratoMutt Strat-Talker

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    Oh, I forgot to post them. :oops: Big scary caps, eh?

    More tomorrow - I am taking requests too.

    IMG8445s.jpg

    IMG8453s.jpg

    IMG8462s.jpg
     
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  4. Silvercrow

    Silvercrow Senior Stratmaster

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    THANKS! Man I love looking at this stuff!

    Big caps..yeah. But on the Ben Fargen Blackbird 20 I swear I never saw any so big. More like a coke can than your typical "can" found in a Fender amp. Dunno who made ';em but they looked like they could kill ya from a distance...LOL!

    Brian
     
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  5. Sarnodude

    Sarnodude Senior Stratmaster

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    I wonder what is that finned heat sink is for?
     
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  6. 3bolt79

    3bolt79 Senior Stratmaster

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    Original tubes since 1981? That's awesome! I wouldn't expect new tubes to last that long. And your amp is in lovely condition. Tell me, what did it cost in 1981 dollars?
     
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  7. Robins

    Robins Dr. von Loudster Strat-Talk Supporter

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    The heat sink does make it look cooler xD
    Some of them had the problem heating up the chassis. Was that a real problem? well, I don´t know but what Randall needed, he did anyway.
    To me that amp looks superclean. I would, most probably just change the wire at the speaker jacks/fb loop. It looks cooked - there comes the heatsink into play. Those caps are crap but it really is hard work replacing them. Ask me how I know xD

    Thanks for pics,
    Robin
     
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  8. Miotch

    Miotch Senior Stratmaster

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    Yes. And if they are like mine, they are secured to the board with silicone. As Robins said, hard to get out of my Mesa.

    Heat !!! (gotta put in the smart-ass comment ocassionally).
     
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  9. Stevem

    Stevem Senior Stratmaster

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    It's a classic example of stuffing 10 lbs of **** in a 6 lb bag!
    I never liked the overall tonal range of these amps with every circuit reacting to one another in a negative way, and the extream difficulty such a build makes on servicing them!
     
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  10. tstone2

    tstone2 Strat-Talker

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    Super nice shape for age. I'm partial to Mesa even if some of them are "difficult".
     
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  11. carver

    carver The East Coast Strangler Strat-Talk Supporter

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    I love Mesa gut shots..

    So clean.
     
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  12. Nick-O

    Nick-O Strat-O-Master

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    I've the MkIIb as well with a 15" EV in rosewood, ordered new in 1977. Such a rich tone. Heavy though, bit of a back breaker.
     
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  13. AxemanVR

    AxemanVR I appreciate, therefore I am... Strat-Talk Supporter

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    Grateful Dead Ad.jpg
     
    Last edited: May 14, 2019
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  14. AxemanVR

    AxemanVR I appreciate, therefore I am... Strat-Talk Supporter

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    `
    Yeah, try servicing this b**ch!...

    My Mesa Boogie TA30 TransAtlantic head:

    IMG_4754edit.JPG
    IMG_4755.JPG
    IMG_4757.JPG
    c1.JPG
    IMG_4748.JPG
    y.JPG
    6753C0D0-99D4-4CB5-AA4D-47EF6891D7B5.jpeg
     
    Last edited: May 14, 2019
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  15. StratoMutt

    StratoMutt Strat-Talker

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    To dissipate chassis heat. The 100 watt chassis came with the heat sink and a substantial 120 volt cooling fan.

    It has sat unused with it felt lined vinyl cover for the majority of its life. I'd be surprised if it has a total of two years worth of higher volume use. Has had more lower volume service using master volume. The power tubes will outlast me at this rate.

    It was $875 plus maybe $21 in FedEx. They were all custom ordered with the exception of two music stores that carried a small stock of them. I think Manny's in NYC was one, the other was a west coast store.

    Yep, just above this post:

    upload_2019-5-14_13-23-11.png

    You might like these too. Most of these are my own scans.

    http://www.flickr.com/photos/100052744@N02/albums/72157690639382380

    http://www.flickr.com/photos/100052744@N02/albums/72157695740566854

    http://www.flickr.com/photos/100052744@N02/albums/72157697660996941

    http://www.flickr.com/photos/100052744@N02/albums/72157698880973914

    http://www.flickr.com/photos/100052744@N02/albums/72157698881106634
     
    Last edited: May 14, 2019
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  16. StratoMutt

    StratoMutt Strat-Talker

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  17. StratoMutt

    StratoMutt Strat-Talker

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    I always wondered if there was a component attached to the chassis on the other side of the heat sink. Nope.

    I played it hard the first several months I had it. Loud.

    Crap caps? Mallory, made in the US? This a time capsule of sorts as so many of the do dads read made in USA.

    I fairly certain the power tubes are Sylvania. The 12AX7 are Positron. The amp came with two spare preamp tubes, still in their clips.

    A close up is the speaker leads. They look OK to me. I'd guess the wax yellowed due to many heat cycles.

    upload_2019-5-14_13-1-39.png
     
    Last edited: May 14, 2019
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  18. AxemanVR

    AxemanVR I appreciate, therefore I am... Strat-Talk Supporter

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    `
    Transistors in the EQ circuit?:

    MII EQ.JPG
    MII EQ 2.JPG

    ...interesting... for the optional graphic EQ?




    `
     
    Last edited: May 14, 2019
  19. StratoMutt

    StratoMutt Strat-Talker

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    Yep. The only options I ordered was the 100 watt chassis and the EVM-12L speaker. I already had an MXR graphic EQ at the time. Did not find it especially useful on this amp. There is a lot of baked in tone control already.

    I took more images. I'll post them up at some point. I have a reassembly job ahead of me now.
     
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  20. StratoMutt

    StratoMutt Strat-Talker

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    Why the down time for the amp? Over the years I lost interest in playing - started around '84. I was listening to more complex music than I could play. Frustrating. Took it up again in '86 / '87. Down again until the late 90's when I played bass and dabbled with electric guitar again. By 2001 dead again.

    In 2003 I bought my first acoustic guitar - a Martin D-16GT. Always wanted a Martin - this was a compromise model. A few years with that - dead again. No electric playing since 2000-ish. In 2015 I finally bought the Martin of my dreams - an HD-28. A year later the 12 string version a D12-28. Still 100% unplugged.

    In 2017 I got the itch to play electric again. I'm still at it with rising and falling levels of interest. I might actually be good if I kept at it for the entire time.
     
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