• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

b&k

  1. dlucy

    BK Precision 2830 3 1/2 digit DMM multimeter restoration

    I've set up a tiny work bench to keep me sane and my first project is restoring a "looks like a 70's blender" DMM from B&K Precision. The BK 2830 DMM is pretty simple, based around a temperature compensated Zener diode, and will give me enough work to remember what all Test Equipment I must...
    • dlucy
    • Thread
    • 2830 dmm b&k b&k precision b&k precision dmm
    • Replies: 9
    • Forum: Test Equipment
  2. G

    Looking for B&K ST-2140 Power Amplifier Service Manual

    Hello - I am looking for service manual of B&K ST-2140 Mosfet Power Amplifier. In 2020 I contacted ATI who owned B&K then and I got this reply: "Thank you for contacting us. Did a search of our legacy B&K database and could not find a service manual or any schematics for the ST2140. Sorry...
    • gramafone
    • Thread
    • 2140 amplifier b&k mosfet service manual st-2140
    • Replies: 2
    • Forum: Solid State
  3. code46

    B&K EX-442 Recap Project

    A couple of years ago my B&K EX-442 started having some channel cutting issues and I stored it away. Now I'm hoping to recap it, set the bias and put it back into rotation.
  4. R

    B&K EX-442 Disaster

    Hi I own an older version of the B&K EX-442 with the golden handles, no blue front panel lines and Toshiba outputs. Recently I put it back into service after it having sat for 10 years. Fired right up with no issues. I carefully readjusted the DCOffset and Bias though it was difficult with the...
    • Ramatam
    • Thread
    • 2sj-115 2sk-405 b&k ex-442 matched pairs repair
    • Replies: 6
    • Forum: Solid State
  5. groucho69

    b&k st-120 power amplifier

    One side is out. Suggestions on where to start looking? My guess is mosfet. What do you think?
  6. richersounds

    B&K AVR307 supports current Dolby?

    B&K AVR307 One of these is for sale near me I want to use it for my pc. If I use the dolby app from windows store will the AVR support the modern format? I also see this avr is upgradable. What exactly can be upgraded?
  7. crazy-in-az

    B&K ST1400 II with distorted left channel

    I bought this amp about three weeks ago, and until last night it has been flawless. Last night I turned it on following the proper order of pre-amp first, then power amp. As soon as a I tried playing a record I could hear a fuzzy sound coming from the left speaker, and the volume was...
  8. rickb119

    Please help me to understand

    I recently purchased a B&K ex4420 online, and quickly discovered that it has a problem. With everything connected (correctly) the volume is very low. To the point that the volume on the pre (tried 2 different ones) needs to be at max to get a low normal listening level. I took it to my tech...
  9. klamsoss

    B&K ST125.2 power-off thump

    Please forgive me if this is a noob question, but I'm relatively new to DIY repairs on audio gear, and most of my experience s basic cap replacements on tube amps. I have a B&K ST125.2 amplifier, which I think sounds very nice indeed, especially with my current-hungry Thiel CS2 speakers. I...
  10. SmartPDX

    I am new to this site I am in Portland, Oregon need help with optimal set up of a music only sytem?

    Hello, I am in Portland, Oregon (east side area) zip 97086 I am new to this site. I am a not an audiophile. I am looking for advise on the optimal hook up of my components in a music only system. I am willing to pay (reasonable) for expert guidance. Looking for someone in Portland area for help...
  11. SmartPDX

    New to this site. Need help with optimal hook up of music only system components?

    Hello, I am new to this site. I am a not an audiophile. I am looking for advise on the optimal hook up of my components in a music only system. I am willing to pay (reasonable) for expert guidance. I have collected these components: B&K PT3 Preamp/Tuner B&K ST1400ii (series 2) I have two (2) of...
  12. ChrisP2

    B&K ST-140 RECAP BOM

    Just finished updating an ST-140, thought the attached BOM would help others as this was a bit of a journey.... 1988 Unit with TO-3 MOSFETs - Which were luckily in good shape Unit had issues on left channel with Offset & BIAS - All Fuses Blown on that channel. Full Recap including 22mF Filter...
  13. Dave451

    uTracer Tube Tester Build

    I've been building again. I had just re-built and calibrated my B&K 707 Dyna Jet tester, which I've been very happy with. I had been looking around, though, for a reasonably priced instrument to do more in-depth tube analysis and matching and found Ronald Decker's uTracer and decided to give...
    • Dave451
    • Thread
    • b&k b&k 707 curve tracer tube tester utracer
    • Replies: 57
    • Forum: Tube Audio
  14. TheBrownNote

    B&K ST-140 Service Manual and/or advice needed (low bias adjustment problem)

    I'm looking for a service manual and/or circuit description for the B&K ST-140 or ST-140M. I already have a few low resolution versions of the schematic, the minimalist owner's manual, and a one-pager on adjusting bias that applies to multiple amps. I'm not sure if they ever produced a model...
    • TheBrownNote
    • Thread
    • b&k bias adjustment st-140
    • Replies: 22
    • Forum: DIY
  15. bimasta

    PLUG-IN VS DIRECT SOLDER CONNECTIONS

    I picked up a B&K ST-1400/II power amp at a GW for $40. A score, in very good shape, 125W into 8 ohms, 165W into 4 ohms, good quality parts. Works fine, has a very good basic sound— but not great. I’d describe it as warm, musical, and “mushy” — smoothed off like a very old tube amp: lack of...
  16. Bigboi33

    Decisions......Thiel CS1.2?.....Vandersteen 1C? 2CE?....or Paradigm?

    I'm having a hard time here.....Unsure which way to go. I really need the expertise of Audiokarma's finest. I have a choice on a pair of : 1) Thiel CS1.2 in Piano Black, still packed away in original boxes 2) Vandersteen 1C's in Black with original boxes 3) Vandersteen 2CE with sound anchor...
    • Bigboi33
    • Thread
    • b&k energy paradigm pioneer spec thiel vandersteen
    • Replies: 13
    • Forum: Speakers
  17. mars_volta

    Picked up BK ST-140 amp and Pro-5 preamp

    Picked up a nice B&K Pro-5 preamp and B&K ST-140 power amp. Can't wait to hook them up and listen! Is this B&K company related to the BK Butler Tubeworks Mosvalve guitar amp company? Both use mosfets to get a tube sound. I love my BK Tubeworks 962 power amp.
  18. recycler27

    B&K EX-442 Sonata Power Amplifier - Power Switch

    It took some time to identify and locate a replacement switch for this amplifier. I hope I can spare the trouble for someone else. This amp requires an illuminated 16A 125V-AC panel mount rocker switch and I tried the usual vendors, Digikey, Mouser, Parts Express, even fleabay. My best option...
  19. Magnavox combo, Hitachi Solid State, B&K TV Analyst

    Magnavox combo, Hitachi Solid State, B&K TV Analyst

    Magnavox combo w/AM-FM tuner and phono from 1968. The screen is burned, someone must have left a pong-type game on the screen for a long time. CRT is somewhat weak but is OK once it warms up a while. $5.00. Also Hitachi Solid state, it allows you to pre-set 8 UHF channels on the UHF knob...
    • Chad Hauris
    • Media item
    • analyst astro-sonic b&k hitatchi magnavox solid state stereo tube tv
    • Comments: 0
    • Category: Horizontal Hold
Back
Top Bottom