Monitor 7B upgrades

F1nutF1nut Posts: 40,831
edited March 2017 in DIY, Mods & Tweaks
Since I decided to keep these of course I had to upgrade them. Pretty much the standard crossover mods, but with all point to point wiring. I removed the fuse and used a 4.7uf in place of the 4.5uf to compensate. I also upgraded the chassis wire and terminated them with gold plated copper fastons. In addition, I installed new binding post plates from Trey, hence the fuse removal, along with new binding posts and a full set of Larry's rings.

I noticed afer I drilled out the rivet attaching the fuse holders to the plate and removed them that the two wires coming off the holders has serious oxidation, which has to affect the performance. If you are considering upgrading your binding posts you should address this issue.

The new stuff.


Close up.


New plates and posts.


This is one of the fuse holders. Pretty bad oxidation.


I forgot to mention......I love the smell of solder at midnight.

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  • vmaxervmaxer Posts: 4,335
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  • Pretty boards. Uncle Jesse once again impresses with clean and professional work.
  • K_MK_M Posts: 1,134
    Great looking work!
    Lsi15, Lsi9, LsiC,Rta11t,M5jr+,M4,SDA 3.1TL, SDA SRS 2.3TL, Rti6....Still listing stuff, a work in progress.

  • heiney9heiney9 Posts: 23,921
    Very clean, very nice!
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30 | EE Avant Pre | EE Mini Max Plus DAC | MIT Shotgun S3 | MIT Z P/C's | updated SDA 1C| SQ Box Touch/Welbourne Labs P/S- Tubes add soul!
  • msgmsg Posts: 4,370
    Nice, Jesse.
    What kind of wire do you like for the chassis wire upgrades?
    I disabled signatures.
  • pitdogg2pitdogg2 Posts: 12,069
    K_M wrote: »
    Great looking work!

    This guy has no idea what mediocrity is. It all been stellar that I have seen.
  • gudnoyezgudnoyez Posts: 6,491
    I will buy them, what no longer for sale? They look good nice work definitely keepers enjoy the fruits of your labor!
    Home Theater
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  • xschopxschop Posts: 880
    I agree, well executed F1. I 2nd the question on wires. Also any wall foam or extra dacron that you prefer?
  • westmassguywestmassguy Posts: 6,217
    Very nice Jesse. I've recommended removing the old fuse blocks for some time. I don't compensate downstream however.
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  • HzTweakerHzTweaker Posts: 457
    See! What you've done there is make me want these fab speakers even more. They look great Jesse.
    2ch rig:
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  • FaustinFaustin Posts: 804
    Very nice work!
  • tonyp063tonyp063 Posts: 497
    Nicely done Jesse.
    Clean. Elegant.
  • machonemachone Posts: 1,048
    Nice work Jessie :)
    Mojo Audio Joule v5>>Quantum Byte w/JRiver 24 and Fidelizer>> Starlight 7 USB >> Mojo Audio Mystique v2 SE>>ModWright SWL 9.0 SE Signature>>Hafler DH-500 Amp+ (Musical Concepts PA-6 Elite Mod)>>
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  • VR3VR3 Posts: 22,478
    Looking good
    - Not Tom /////

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  • RicardoRicardo Posts: 10,509
    Nice I miss mine. Is @cincycat13 still around? Maybe he will sell them back to me....
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  • george danielgeorge daniel Posts: 11,952
    Just reading this thread makes me wanna go dig out mine
    JC approves....he told me so. (F-1 nut)
  • la2vegasla2vegas Posts: 3,100
    @cincycat13 hasn't been here in a month and a half.

    Everybody who passed on these 7's when they were offered for sale is surely regretting it now.
    2.3TL, 3.1TL, SRS 2, SDA 2B, SDA II,SDA 1C, 7B, 7C, 7 series 2, 10B, 5JR+, 5JR, 5A, 4.5, 4, RTA 11TL, RTA 8TL, RTA 8T, LSI9 Ebony, LSI7 EBONY, LSI7 CHERRY, LSIC, RTI A7, RTI A3, CSI A4, CSI A6, F/XI A4, RTI4. That's all for now.
  • KilgoreKilgore Posts: 4
    Nice! Very clean.

    I'm thinking about upgrading my Monitor 7C's with new tweeters and a crossover rebuild. They still sound pretty good, but are around 30 years old so I figure it's time.

    Can any of you who have upgraded tell me what improvement I should expect? Compared to some nice systems I've listened to, my modest system has a bit less separation and more sibilance. Some recordings can sound a bit harsh; I think the tweeter replacement should help that by balancing out the treble.

  • ConradiclesConradicles Posts: 5,767
    Great job...A classic all around nice sounding speaker. I bet the mods paid off. Enjoy.
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