• 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

bogen

  1. F

    New to Tube amp conversions

    Hi I’m new here, and new to working on tube amps. I recently acquired some amps from the 50s and 60s that have been successfully converted to great guitar amps by other folks. I am going to need all the help I can get, so if anyone knows people on here that are good resources for these kind of...
    • FloydianTrip
    • Thread
    • bogen guitar amps midland tube amp conversion webster chicago
    • Replies: 17
    • Forum: Introductions
  2. A

    A pair of Bogen DB130's sing again

    Just finished a trio of Bogen DB130 amplifiers. I did a full restoration on these. While I'm not a body and paint person, I think I did OK. Two of them were in decent shape the other needed quite a bit of work done. After several cleanings, they all received a full recap, some getting new...
  3. A

    Question on Bogen DB130 damping

    I recently picked up 3 Bogen DB130 amplifiers. Two will go back into service replacing the Heathkit A7s I rebuilt. They work fine but don’t match the room. Besides the usual questionable wiring practices by previous owners that I’m fixing I came across this. There is a 100ohm pot, 0.47 ohm...
  4. Carbsandcaps

    Bogen voltage problems.

    Bear with me this may be a long one. Working in a bogen srb-20 with some strange biasing and voltages. It uses 6BM8 outputs. Pin 9 (the plate of the triode) has 90v instead of 120v. Pin 1 (the grid of the triode) has 20v on it. The biasing has a weird setup. I’m supposed to have 20v on the...
  5. Carbsandcaps

    Biasing a bogen srb-40

    Working on a bogen stereo receiver and I’m trying to set the output bias. It has a weird current monitor setup where normally the cathode goes straight to ground but then you open these connectors and that puts a 15ohm resistor into the circuit. I’m assuming you then set the bias through the...
  6. GrandDesigns

    Bogen AP-60 found in the dust

    I found a Bogen AP-60 integrated amplifer that's been in storage for a while. It's filthy and I've been cleaning off the accumulated dust and grit. I have not attempted to plug it in or turn it on. I saw this post about another AP-60 and what steps to take to see if it had any life, and it...
  7. H

    Just grabbed a Bogen AP-60 from estate sale. What next?

    Just grabbed a Bogen AP-60 in the original Bogen cardboard box from an estate sale. The "kids" said Dad still used it up until 2016, but it was mothballed when he passed away. As far as I can tell, it is complete and in very good, used condition. I have not applied power. Any suggestions how...
  8. D

    Where to find Bogen receiver from early 70s?

    OK, so you would never accuse this of being a post on high-performance audio, but for reasons that defy explanation I'm looking for a Bogen DB240 receiver, which has been nominated in AudioKarma discussions as one of the worst pieces of gear ever. Maybe it is. I'm trying to find out if it's...
  9. davstev

    Bogen BR-360 - A curious GW find

    Picked this unit up last night for $15.75 at the Goodwill. It was a diamond in the rough, covered with 50 years’ worth of fingerprints, grime and dust. I could tell that it was in decent shape, It powered up, with dial lights, and it was heavy and mega solid so I bought it. First thoughts...
    • davstev
    • Thread
    • bogen br-360 receiver reciever sansui solid state tuner vintage
    • Replies: 17
    • Forum: Solid State
  10. Versa81

    Anyone ever hear of these LSI Bogen EP-10 Headphones?

    Have of pair of these, they seem pretty decent and sound nice but nothing comes up online when I search for them. Wondering if anyone has ever heard of these or knows anything about them.
    • Versa81
    • Thread
    • bogen headphones lsi rare vintage
    • Replies: 3
    • Forum: Headphones
  11. guinypig

    Bogen RP60 Distortion

    Hi, I'm currently working on a Bogen RP60. - All tubes test OK - All PSU caps have been replaced Yet, the amp suffers heavy distortion, and I'm not certain where to look from here. One thing I noticed is that when I turn it off, It starts to sound good while the caps are draining. Ideas...
  12. guinypig

    Bogen RP60 Power supply resistors

    Hi, I am currently working on a Bogen RP60. I just noticed that 2 resistors in the power supply do not have the value indicated in the schematics. R84 and R87 are supposed to be 33K but have apparently been replaced with 10K like R85 and R88. Can anyone confirm that the value of the factory...
  13. sean sweeney

    Anyone know what some of these Bogen preamp modules are for? Oddball modules for oddball amps!

    This thing sucks! deletes entire posts if you take to long and type A LOT and put a TON of pics... Anyway... sorry, I was curious about these preamp modules that came along with these Bogen amps I got today... What was the reason for these things? They don't seem to do much that the amp isn't...
  14. BigBogner

    JBL P30’s making harsh “clipping” sound

    Hi friends, please excuse me if this is the incorrect format as it is my first post here. Over the years I’ve developed a humble rig and a mild obsession for vintage audio gear. Along my way I encountered a pair of JBL P30’s which were oddly enough made in Denmark. Lately, the tweeter on one...
  15. nickdinatale

    Bogen E75 - anyone ever seen/heard/worked on one of these?

    I recently got one of these from a lighting and sound company that was cleaning out their warehouse. Allegedly, it was used in the old Boston Garden for PA purposes. I did a Bogen DB20DF a few years ago and was really impressed with the sound, so I'm eager to see what this one can do. This amp...
  16. vaathi

    Went to pick up Bogen Presto Stereo Mono and ended up with Thorens :)

    CL ad was a day old and it was for Bogen Presto stereo mono turntable for half a Benjamin and when I went there the gentleman said he got a turntable he pulled from the console and it had two tonearms. One of his associates has taken the other tonearm and he still has the turntable. I went and...
    • vaathi
    • Thread
    • bogen fairchild 235 fairchild transformer lenco
    • Replies: 6
    • Forum: Turntables
  17. gdmoore28

    Hey, Bub - Ya Want These Things? Why, Yes, Thank You.

    Just another of those speaker find tales. A friend makes very good money cleaning out foreclosed houses, storage buildings, and old estates. He'd just finished up one of the latter when he sent word that there were some "old speakers" on the trash trailer he was about to dump. "If you want them...
    • gdmoore28
    • Thread
    • bogen ev 15trxb pioneer pax-30b
    • Replies: 15
    • Forum: Speakers
  18. ETQuall

    Bogen PAs to home stereo

    Uh, long time listener, first time caller... Bought two of the Bogen CHB-35a PAs off of a popular auction site (schematic attached). Took awhile to get two of the same at decent prices, but I DO love when churches decide to upgrade their audio systems. End-goal is to have a nice home stereo for...
    • ETQuall
    • Thread
    • bogen hi-fi monoblock amplifier parallel triode tube amplifier
    • Replies: 4
    • Forum: Tube Audio
  19. whittington

    Bogen DB20 project with my son

    Hello! This is my first post. I am new to tubes somewhat. I recapped a Fisher 500c recently and my ears have been blessed. More on that later. I have had two old Bogen DB20 s sitting in the garage for about ten years waiting to be worked on. Given to me when I did not own a soldering iron if you...
    • whittington
    • Thread
    • bogen bogen db20 bogendb20 brass faceplate new to tubes tube amp
    • Replies: 5
    • Forum: Tube Audio
  20. moschops

    Bogen RR-501

    Hello all, I've come upon a 1956 Bogen RR-501 mono receiver in decent shape and was thinking of giving it a little restoration but I cannot find schematics anywhere. The Radio Museum lists one, but it turns out to be for the RR-501-B, which is a bit different. Nothing at Hifi Engine or in...
  21. bfotk

    Getting to the front panel switches Bogen DB114

    The speaker selector slide switch on my Bogen DB114 has crapped out. I don't want to replace it with a new slide switch (unless I can find one with a white plastic slider). So my plan is to get to the switch and jump the terminals so it feeds the A speaker only. Should be simple...once I...
    • bfotk
    • Thread
    • bogen db114 dissassemble speaker switch
    • Replies: 10
    • Forum: Tube Audio
  22. nickdinatale

    Wake up early and try to get a Bogen DB-20?

    There's an estate sale in my area tomorrow AM and I happened to notice this Bogen (DB-20 if I'm not mistaken?). I'm getting ready to go to bed and I'm trying to decide whether I should set my alarm nice and early to beat out the pro estate sale goers. Any thoughts?
  23. RSMRecording

    Turntable Repair in the Boston Area

    Hope this is the right place to ask this question, I am looking for a reliable and recommended turntable / HiFi gear service shop in the Boston area. I have been using a repair shop on the North Shore but lately I have been getting turned away because they "can't fix it" which I think it is...
    • RSMRecording
    • Thread
    • bogen lenco reapir service service recommendation turntable
    • Replies: 3
    • Forum: Turntables
  24. R

    Bogen CHB 35a - Guitar Amp Conversion - I have questions (of course)!

    I got a Bogen CHB 35a. A 6C4 phase inverter is on the way from Triode USA. The OT and 7868 tubes are working. I'm reading the schematic (attached) and I'm a bit baffled on a few points. To start with, the OT. So many secondary windings! I'm not too concerned about the 24v but I'd still like to...
    • ryanpg
    • Thread
    • bogen bogen guitar amp chb chb 35a
    • Replies: 19
    • Forum: Tube Audio
  25. Johnny_Law

    Bogen DB212 Hot Chassis!

    My first tube amp. :banana: Very excited. Problem: chassis is hot. Intermittently. If I hold my finger on the faceplate while it's plugged in, I'll get a nice sizzle up my arm from time to time but not constantly. Has anyone seen this before? Know what to check? I have the circuit...
Back
Top Bottom