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poweramp

  1. James Cox

    Early Mcintosh MC250 restoration

    Hi everyone! I recently found a great deal on an MC250 poweramp with an MX110z preamp. My initial plan was to restore the MX110z first but unfortunately it was very badly damaged in shipping (broken glass, broken tip of the power knob, broken panloc button, etc) so I've decided to start with the...
  2. OFrank

    Marantz 2325 Transistor Substitutions.

    Hello Everyone, I need some help from all the Marantz guru’s. I have read in another post that the possible cause to an intermittent loud popping in the 2325 power amp might be the H706 - 2SA818 and H707 - 2SC1628 transistors. I see that the recommended replacement transistors are KSA1381for...
  3. J

    McIntosh MC2505 Bulb Specifications??

    Does anyone know the exact bulbs required to make a MC2505 glow like new? I’m looking to replace all of them. thank you!
    • jgduck
    • Thread
    • bulbs mcinstosh power amp poweramp
    • Replies: 1
    • Forum: Solid State
  4. T

    technics se-9200 bias adjustment?

    I am currently working on a se-9200 power amp that really does not need that much work. I adjusted the dc offset on the speaker leads to 0.00 volts however I also wanted to adjust the bias but I couldn't really find anything about this in the service manual. I was expecting maybe a target...
  5. Ren_

    JVC M-L10 protection above 10 watts with same but shorter speaker cable

    Hello, now I encountered a problem with my poweramp, recently I reterminated my 4.5m Naim Naca5 speaker cables and cut it down to around 2.6m. It was working entirely fine until I decided to increase the volume more to 10watts on the meters. Then, it decided to go red on me until the volume knob...
    • Ren_
    • Thread
    • jvc poweramp victor
    • Replies: 0
    • Forum: Solid State
  6. D

    Where did they all go?

    Just spent days trying to find resources for a detailed evaluation/recap/rebuild of some very persnickety power amplifiers. Gobs of Marantz bench experts but SAE, not one was found. No mention of GAS or SUMO either. Do any of you guys know any deep bench guys that understand these amps and...
  7. KNielsen

    Amplifier build

    Hey AK I'm starting this thread to share this build, and hopefully get some feedback while doing so. It's gonna be an expensive build, so slow process is suspected :) The chassis that'll suit the 8pnp/npn will be from Modushop; 5U/400mm There are some adjustments to the old schematic I'm posting...
    • KNielsen
    • Thread
    • amplifier diy diyamplifier diypoweramp diypoweramplifier poweramp poweramplifier schematic
    • Replies: 30
    • Forum: DIY
  8. K

    Need help identifying missing tubes for mystery amp

    Hello, I'm working on restoring this small power amp. It looks like it came form some sort of turntable console or something since it has plugs to switch the power, an extra a/c plug, and maybe power delivery for an a/c motor. It appears to be stereo and single ended for each side. The power...
    • kanurys
    • Thread
    • amp power poweramp stereo tube
    • Replies: 21
    • Forum: Tube Audio
  9. quadmatrix82

    Marantz 250 restoration query

    Hi Marantz gurus, I’ve started restoring my Marantz 250 - have been reading up on the numerous threads here how people go about it and wondering is the fly back diode mod detailed in the service bulletin mandatory for any Marantz 250? or is it for certain ones pending their serial number? My...
  10. T

    Audiotech Massachusetts USA Audio Manufacturer -- anyone know them?

    Hello, I have a couple of Acoustech components: a power amplifier and preamp. The power amp uses 1/4" jacks for input (perhaps progear?) The knobs look McIntosh-like but not a match. It isn't Stereotech. The power-plug looks almost Fisher-like in shape but has an "AT" in the recessed circle...
  11. Rotel Power Amp Specs

    Rotel Power Amp Specs

    From Rotel '80/'81 catalog page 35.
    • House de Kris
    • Media item
    • poweramp rotel specifications
    • Comments: 0
    • Category: Component Gallery
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