B&k st2140

BKphoto
BKphoto Posts: 409
edited August 2014 in DIY, Mods & Tweaks
Hey everyone....I have a blown internal fuse, its never "for no reason" what should i be looking for outside of the obvious...?

there wasn't any drama, i just unpacked it and hooked it up and no left channel...

thanks, Brent
Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • Dennis Gardner
    Dennis Gardner Posts: 4,861
    edited August 2014
    It sounds like the previous owner blew it. Those blow when speaker cables get crossed when hooking up with the amp on. I would replace the fuse with exact replacement and power up without a speaker on it to see if it will hold. If it holds, power it down, hook up a speaker and try it out. I blew a rail fuse on one of my Odyssey amps doing just what I explained, it happens.

    If it blows when replaced, you got a faulty amp.
    HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable

    2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
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  • BKphoto
    BKphoto Posts: 409
    edited August 2014
    sounds good thanks...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • agfrost
    agfrost Posts: 2,430
    edited August 2014
    Forgive me if this is too obvious: Be extra sure to get the correct fuse replacement value and type (slow or fast blow).

    http://www.bkcomp.com/fileadmin/content/bk_support/FAQ/fuse%20listing.pdf

    Hope it's just a fuse and nothing deeper!
    Jay
    SDA 2BTL * Musical Fidelity A5cr amp * Oppo BDP-93 * Modded Adcom GDA-600 DAC * Rythmik F8 (x2)
    Micro Seiki DQ-50 * Hagerman Cornet 2 Phono * A hodgepodge of cabling * Belkin PF60
    Preamp rotation: Krell KSL (SCompRacer recapped) * Manley Shrimp * PS Audio 5.0
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  • BKphoto
    BKphoto Posts: 409
    edited August 2014
    4 amp slow blow is what the manual says
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • BKphoto
    BKphoto Posts: 409
    edited August 2014
    OK....so new fuse in turned on let it run for about 15 mins and fuse held....So next step put it back in the system and see what happens...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • Dennis Gardner
    Dennis Gardner Posts: 4,861
    edited August 2014
    I will bet you are okay to go. I think the seller, touched the speaker cable +&- together on that channel with the amp on before he turned it off. They put that fuse in for times like this.
    HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable

    2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
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  • BKphoto
    BKphoto Posts: 409
    edited August 2014
    I hope so.... nervous...

    although its quite nice on the inside...blew out the dust (wasn't a lot)...

    I have to hang the new front door before i can put it back (wife knows she will lose me if I do the stereo first)
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • BKphoto
    BKphoto Posts: 409
    edited August 2014
    New front door looks great...Amp, not so much...

    still no left channel....

    mother ............!
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • Dennis Gardner
    Dennis Gardner Posts: 4,861
    edited August 2014
    Sorry to hear that. Hope you can get it worked out as that is a really nice amp!
    HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable

    2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
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  • BKphoto
    BKphoto Posts: 409
    its now sitting at Bristol Electronics in Jersey....

    My patience is running a tad thin...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
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  • msg
    msg Posts: 10,121
    How did this turn out? I have some older B&K gear myself, and wonder about repairs if it ever goes bad. Hope you got it repaired without much bother or cost. Doubly hope the previous owner didn't knowingly take you for ride.
    I disabled signatures.
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  • EndersShadow
    EndersShadow Posts: 17,593
    msg wrote: »
    How did this turn out? I have some older B&K gear myself, and wonder about repairs if it ever goes bad. Hope you got it repaired without much bother or cost. Doubly hope the previous owner didn't knowingly take you for ride.

    I am not the OP obviously but I have some insight here...

    If I had B&K gear I'd do the following:

    1. Contact B&K for the service manuals for your gear. The B&K website lists a contact for that stuff. I recently used it to get both an Owners Manual and a Service Schematic for my B&K 200.5. The guy was very responsive to my inquiries and very helpful.

    2. I'd also look at the schematic (or have someone who knows what it means) and have them see what parts are hard to find.

    3. Once I had that list, I'd contact that same person to get contact info for places to look for those parts and buy as many as you can extra. I dont have the companies name in front of me, but he gave me a company name and phone number to contact (which I passed along to my tech).

    I say this because my 200.5 had an issue and blew a channel as well. I have a local tech whose quite skilled at repairs and with the contact info and the schematic he was able to repair the blown output transistors on that one channel. He didn't seem to think there was anything super tricky about the way the amp was put together, just time consuming taking it apart for the fix.

    For me the total cost was 140 including parts. So its NOT super expensive to repair (provided its just one channel), but my tech also let me know that some of the parts were becoming harder to find (because of the large quantity of fakes on the eBay market) so he had to pay a nice markup to get legit transistors and have them shipped from Cali. The parts cost was 40 bucks for 2 transistors and JFet's (IIRC).

    I plan to stock up on some as a just in case so I have them.

    Anyway thought I'd weigh in since I recently had a B&K repair experience.
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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  • msg
    msg Posts: 10,121
    that is EXCELLENT information and a great recommendation. I have a couple of pieces of B&K gear. probably need to find a good local repair guy. how does one determine whether a repair shop is good? guess that's tricky.
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  • EndersShadow
    EndersShadow Posts: 17,593
    msg wrote: »
    how does one determine whether a repair shop is good? guess that's tricky.

    I worked through my local trusted contacts to find one. Thankfully a couple guys I know and trust had used this person before for some stuff and his name was one I had heard a couple different times.

    This guy builds custom tube amps and repairs a lot of vintage hi fi (tube radio's, keyboards, turntable's, etc). It is nice he's in my backyard basically otherwise not sure what I would do.

    I am sure you can send it back to them to look at repair, but since my 200.5 is 78 lbs and quite a monster that would be VERY expensive to ship it, let alone a total overhaul on it.
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
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