How to fix Noise + add Master Volume Fender Bassman 6L6 tube guitar amp

24 Comments

  1. Buddysimo Simonetta

    Better would be a mid control that works for both channels and the bass channel tone stack turned into narshall.

  2. Super Het

    Excellent job, Terry, as usual. This has inspired me to finally take a look at the “yard sale find” black face Bassman that’s been in my basement for years. I always enjoy your videos, and always learn something. Thanks for sharing.

  3. Darkstar

    Was something getting microphonic at 1:301:50ish. Your audio was a little reverby.
    Or was that a different mic?

  4. John Templeton

    While your in there, have you thought about replacing the 100k CC plate resistors with 1 watt metal film? That will give you a big drop in hiss and intermittent popping caused by the breakdown of the CC resistors.

  5. Jason Kirkham

    I loved seeing that amp. but, more so.. I enjoyed learning a few new things. Thanks Terry.

  6. Randall Yeager

    I’m surprised no one has chimed in about the master volume mod yet. I’ll explain why I added that. I should preface this by saying I’m a purist, when it comes to gear and tones, but there are realities to deal with, and Fender wasn’t perfect. I play with mostly dirt boxes that like to see the amp at the verge of breakup, what the post inverter mod allows me to do is get that at any volume, whether I’m practicing alone, with a band, or at a gig. Power tube saturation is a HUGE part of a killer recorded sound, that’s why guys like Jimmy Page used small amps for recording, so they could run it full bore. For recording, I’d run this amp as loud as I could before the preamp over saturates, but for cleaner sounds, I can definitely use the master volume to record a more pristine tone that doesn’t need that power tube saturation.

  7. Ben Prevo

    Hi from Dublin — love your vids — 2 things I find — sometimes those carbon screen and grid resistors get baked and cracked and make noise — also may I respectfully suggest to solder the grounds directly to the chassis — I has seen bias failures etc die to bad continuity on those lugs bolted on the transformers — peace

  8. DeadKoby

    If I recall, correct me is I'm wrong. 8:10, ceramic disc caps are essentially made like a piezo transducer, and WILL generate power when moved, pinched or tapped on…. thus the noise on that is expected… at a modest level

    at 16:25, the older style caps had a higher ESR than the newer stuff does/did. I know ESR can climb with age, but in reproducing vintage circuits, it seems some of our new components perform better.

  9. bbmade

    Excellent video! I have two of these heads and the work on the first one is almost done so it was good to see this video. Did you check the filter caps at some point or know they had been replaced with the other electrolytic’s? Really enjoy your videos, always learn!

  10. Angelo J Richetti

    This Amp saw the inside of a home and a Studio..it never saw a Club or any type of hall ..its been only home and studio used..another great video Terry always learn something from you

  11. The Radio Shop

    Very clean amp. Also nice troubleshooting and modification. Excellent work as always Terry.

  12. jobyregrets

    Great Video! I love the thorough ones. It does make me sad tho because I owned a 67 that was just as clean… in fact I think I traded it to a guy in Indiana… Crap… lol…

  13. tphoenix69

    Question for you Terry: Why didn't you examine the filter caps topside? I would think that would be the first place to look for noise complaints and are a common fault area ripe for leakage. Keep the videos rolling my friend. Great job as always!

  14. Ron C

    Terry, I have worked on many of these and that one is pristine.If that had the Drip Edge it would really be a relic. I had that crackle problem Many times, and it was the disc cap as well. One had a hairline fracture. After replacing the amp was quiet as can be. I use the same soldering station – its awesome. I also noticed you added an electrolytic cap on the center of the Bias Pot to ground. Was that to eliminate noise or to ensure the negative bias was not affected ? I did notice the master volume slightly changed your negative bias.. very slightly. Nicely done Terry, as usual !!! P.S. I notice you are not using the Hakko Lockout Key on your unit – Be careful…. Dick from the Internet may come and change the temps on you… LOL Seriously, really quality video again.. well done – THANKS RON

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