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dim bulb tester

  1. C

    Another Dim Bulb Tester Question

    I have a fully functional DBT and recently tested it with a small Lafayette LA-224T solid-state amplifier. The amp is rated at a 30-watt power draw and has a relatively low output. When I connect the DBT, there’s no light at all, regardless of which bulb I use — I’ve tried 25W, 40W, and 75W...
  2. A

    Dim Bulb Tester for 230V?

    I've read a lot of info about dim bulb testers and it seems that a 100W bulb would fit most cases. I'm planning to build one to help when I recap my SX-850. The thing is that all the info is from people in the US where 120V is used and I live in the Netherlands where we have 230V. Should I still...
  3. FRANKPIETTE

    Dim bulb tester reactions

    Hi everyone, I got a Kenwood KR-4600 receiver. First i just tested it on my dim bulb tester (60w) to power it On, and a slim dimmed of the DBT remains. Since on DBT i hooked a CD player to Aux., then Tape In for the same CD player. On both case the dim bulb tester reacts/follows to the volume...
  4. dlucy

    dlucy's guide to Dim bulb testers, Variacs and autotransformers

    Following is a convenient collection or compendium of information and posts from elsewhere on AK and therefore from many different members. Where possible, the posting member has been credited and the source thread or post has been linked. Corrections and additions (and updates to modern info)...
    • dlucy
    • Thread
    • autotransformer dbt dim bulb tester dimmer variac
    • Replies: 20
    • Forum: Test Equipment
  5. Refugee

    Another dim bulb tester build

    Dim Bulb Tester Build First, What is a dim bulb tester? It is a current limiting device. It is used to protect a device that is in unknown condition or suspected of not working for any reason. If the device under test (DUT) has a short, the device will be protected from drawing too much...
    • Refugee
    • Thread
    • bulb cigar box current limiter dbt dim bulb test dim bulb tester project box safety test test eqipment
    • Replies: 5
    • Forum: DIY
  6. FireGuruMN

    Bucking Transformer in a Box

    I have a variac on my bench and a bucking transformer also on my bench for when I am listening to a tube amplifier while restoring another project. I don't like to use the variac all the time because it buzzes and I use it too often on whatever I am restoring at the time. So I wanted to build...
    • FireGuruMN
    • Thread
    • bucking transformer dbt dim bulb tester variac
    • Replies: 8
    • Forum: Tube Audio
  7. klamsoss

    Variac powered, fused, dim bulbed, and metered, switched bench power?

    Good morning race fans! Relative newbie looking for some input on a DIY bench power monitoring station... I have been working on tube gear for a year or so and the variac is a great tool. I have a 15A staco unit that weighs enough to use it for home defense. I also put together a DIY AC meter...
    • klamsoss
    • Thread
    • bench dbt dim bulb tester meters testing variac
    • Replies: 26
    • Forum: DIY
  8. Brivan

    Retro-Style Dim Bulb Tester

    This is my newly-completed retro-style dim bulb tester. Made from an old decade resistance box, it has three new retro-style 60-watt bulbs, sockets and switches and new cloth-covered cords. The top is made from 1/4-inch-thick black HDPE. Shown off; two bulbs on with a 60-watt load; and three...
  9. H

    VARIAC DIM BULB TEST and HARMON KARDON 930 REBUILD

    This is mainly a question re: Dim Bulb Tester. I was running a fully rebuilt HK 930 thru my Variac and Dim Bulb setup and all was fine at 120V and I was listening to a perfect receiver. After about 15 minutes the bulb flared and I quickly turned off the receiver. I can find no faults now or...
    • HankM
    • Thread
    • dim bulb tester solid state
    • Replies: 1
    • Forum: Solid State
  10. Stink Bear

    What went wrong?

    Recently I acquired a Fisher RS-2004A integrated receiver / amp. It had two burned fuses on the power board, both 6 amp if I remember correctly. I replaced them and powered it up on a dim bulb tester with a 60W bulb. It turned on and I got a music out of it for a short time and then a resistor...
    • Stink Bear
    • Thread
    • dim bulb tester
    • Replies: 7
    • Forum: DIY
  11. PastTechFan

    Harman/Kardon HK730 Problems -Help!

    Well, my Dad's HK730 crapped out in mid-song last week. I think I've narrowed it to the preamp section (no signal out to another amp), but the amp section (when fed from another pre) only seems to have one channel. (I've forgotten which, but could check if that helps.) I checked all the...
  12. jdg123

    Sansui Blues - 5000A and AU-919

    OK guys, I'm just a parts changer. I'm a very careful parts changer. I read up all I can, make extensive lists, maps if you will, to the completion of recapping and up dating of transistors and I go in with the idea that I'll do no harm. Most times I hit the mark and I get a working receiver...
  13. c.coyle

    Dim Bulb Tester Saves My Dupa

    Fixing up a friend's Marantz 2252B. I pulled and tested the output transistors, then re-installed them with fresh mica and grease. Before pulling them, I had carefully noted their position - NPN PNP PNP NPN - and even made a diagram on my bench. Embarrassingly, I completely forgot the diagram...
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