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power amp

  1. D

    Sansui AU101 distortion

    Hi Sansui lovers, My right channel of my Sansui AU101 has a problem. Any help is welcome. When I turn up the volume (not so loud), the right channel only manages to drive the speakers for a few seconds and then jumps (instantaneously) to a distorted sound (right channel only). If I turn the...
  2. terminalVolt

    Surround Processor & separate amps

    What are peoples thoughts, experience, and/or recommendations on surround preamps/processors and separate power amps? I have 4 dual-mono power amps that I would really like to use in my theater setup. My reasoning is primarily because I would much rather replace the head unit when I want an...
  3. terminalVolt

    LF Transducers & Crown D150a

    Hello all, long story short I am needing a way to properly produce 16hz, most woofers simply don't seem to be able to respond at that low a frequency. I plan to purchase a low frequency transducer and either mount it to a stud in my house or to the raised floor and power it off of a d150a II...
    • terminalVolt
    • Thread
    • crown d150a low frequency ohms peak power amp rms transducer wattage
    • Replies: 19
    • Forum: Introductions
  4. PZimm

    Guidance DIY SS Power Amp

    I want to build a solid state power amp class a or ab utilizing DIY amp boards on EBay or other sources. I’m trying to not go too expensive on this as a lot of the purpose is to learn but ultimately have a respectable component for my system. Is there any guidance on matching a power supply and...
    • PZimm
    • Thread
    • diy power amp power amp power amplifier
    • Replies: 0
    • Forum: DIY
  5. lattiboy

    Anybody else hop aboard the Hype(x) train?

    Hey all, I’m about two weeks into owning the Audiophonics MPA-S252NC Hypex Ncore amp (based on the 252MP module) and I’m wondering who else has tried out a hypex power amp? I’m going to write up a proper review next month, but so far I’m incredibly impressed and cannot imagine any power amp...
  6. M

    Choosing a silent power amp for control room

    I always loved my HAFLER P5000. What a powerful clean sound. One day a channel went out (the cooling design isn't so great). So I bought a crap alesis amp to get something quickly, but I hate it with a passion. So I'm looking now to find an amp, but I'd love to find something without a fan...
    • morganomega
    • Thread
    • choosing a power amp hafler power amp pro5000 silent power amps that sound great
    • Replies: 59
    • Forum: Solid State
  7. lattiboy

    Crown Amps, the hype is real!

    I’ve been hearing about using “pro” amps in favor of more expensive consumer amps for a while now. On a lark, I picked up a crown XTI 2000 about a year ago. I hadn’t really needed it in then, but it was too good a deal to pass up and it promptly entered my stack of unused audio equipment. “Mount...
  8. V

    SX-850 very low level hum, right channel only

    This is my first post as I haven't been able to find any clues on this excellent forum but somebody may have had this problem before, which is a hum in right channel only with or without the pre-power jumpers fitted so it is the power amp only at fault, not the power supply as only one channel...
  9. Andyrlb

    Alchemist kraken pre and power

    Love this pair . You either love the design or you hate it , me I love it , and it sounds great through my Tannoys.
  10. J

    JBL L100t power

    Hello, I recently came into some JBL L100t's. I replaced the tweeters and refoamed the woofers and they sound great...one at a time. The problem is, I have a Marantz 1070, which I believe is only 35 wpc. From what I've researched, the JBL's should have at least 100wpc or up to 400. Can I hook...
    • janeej22
    • Thread
    • jbl jbl l100t marantz marantz 1070 power amp vintage jbl
    • Replies: 10
    • Forum: Speakers
  11. rickl

    Citation 22 output transistors needed

    I'm trying to bring back a dead 22. I've narrowed down the problem to the outputs and drivers. I need: Q439 2SC3298A, NPN Q437 2SA1306A, PNP Q441,Q443 2sc3907, NPN Q449,Q451 2SA1516, PNP a search suggested 2SA1516 / 2SC3907 can be replaced with 2SA1962 / 2SC5242 for a big yamaha. Is this...
    • rickl
    • Thread
    • blown output transistors citation 22 harman kardon power amp
    • Replies: 5
    • Forum: Solid State
  12. scootsity5

    Sansui 5000X channel mismatch

    Hello all I just recapped my Sansui 5000X and at the end noticed a massive channel unbalance. The right channel is outputting about 10-20V (peak-to-trough: when the left channel was at -20 to 20, the right was at - 10 to 10 using a 1khz sine) less than the left channel. I hadn't noticed because...
  13. musichal

    NuForce STA200 Power Amp

    First, I want to make it clear that I have not heard, do not own, nor am I considering a purchase of this amp because I simply have no need for it. However, it looks like it could be a winner, and I failed to find any threads about it. So if you show me one (or five) such threads, then, well...
  14. M

    No sound from the left channel of my receiver

    I have a Harman Kardon AVS 25II and there is no sund comming from the left channel, I'm sure it has something to do with the pre-amp. When I remove the bridges in the back and plug in an audio interface to the power amp it sounds great so the power amp is good so are the output transformers. I...
  15. S

    Preamp out to power amp question

    Hello, longtime lurker here. Hope I'm posting my receiver pre-out and power amp questions in the right place. I want to hear the sound of the power amp, and use a receiver as a volume control for incoming computer audio, and possible hook up two sets of speakers at once. the power amp has...
  16. M

    Onkyo M506RS ... “servo”??

    I picked up an Onkyo M506RS. What the heck is the servo?
  17. Andrew Heck

    Bridging Parasounds

    In my present system I’m driving 150w speakers with a 100wpc power amp. I run my power amp wide open and control volume with my preamp. When I am really pushing the volume, the preamp potentiometer sits at 1 or 2 o’clock and I’m worried about inaudible clipping damaging my speakers. What I...
    • Andrew Heck
    • Thread
    • bridged bridging amps clipping parasound power power amp
    • Replies: 27
    • Forum: Solid State
  18. Kreshna

    Sansui integrated as preamp? Sansui integrated as power amp? Please share your experience.

    A friend of mine has both Sansui AU-9900 and NAD 3020. He actually prefers the NAD to drive his JBL 4425. However, out of curiosity, I ask him "cross" both amplifiers with each other. When he connected the NAD 3020 pre-out to the Sansui AU-7900 pre-in, using the NAD as preamp, he said the system...
  19. C

    Line Direct on Sansui Integrated amps?

    Hi again folks. I have discovered that I have been in error thinking that the "direct" inputs on Sansui Integrated amps (specifically the Alpha 907NRA but I suspect this will apply much more broadly) were meant to be used as a "power amp direct" input in that they bypass the pre section and...
  20. W

    Power Amp for Rogers Studio 1?

    I recently purchased a pair of Rogers Studio 1s that a local hi-fi nut had restored to the tune of $1k and was selling complete with custom stands for under $500 just so he'd have room for his next project. Right now I'm driving them with a 35w NAD receiver that I bought somewhere around 1995...
  21. thought91

    DAS E20 power amp?

    I have the opportunity to buy one of these for 300 bucks locally, but I'm not finding much on them online. Anyone have any info on the amp? Thanks in advance!
  22. TheBrownNote

    How critical is Mosfet matching in power amp output stages?

    I have one and a half B&K ST-140 amps, and I'd like to convert them to a dual mono amp that would be similar in design (but not identical) to the older versions of the B&K EX-442. One of the amps I have now is the regular stereo model which I've already done some parts replacements and...
  23. T

    Marantz 4240 left channel sounds fuzzy and muffled - video link in posting

    Hi Gang! First time posting here, let me start by saying ahead of time that I respect and appreciate everyone's expertise here on AK. I have a wonderful old Marantz 4240 that has served me well over the years. Recently a friend came over to listen to a mix of some recordings he recently made...
    • the retro la
    • Thread
    • 4240 amplifier diagnosis left channel distortion marantz marantz 4240 muffled power amp problem
    • Replies: 5
    • Forum: Solid State
  24. QSilver

    Pioneer SM-700 - Quite impressive little thing!

    Picked one of these up a while ago just as a curiosity. I got round to re-capping it today seeing as it days from 1970 I figured it would be best. Most caps measured 70% over what they should. Only strange thing was how they had used one capacitors terminals to bridge two sections of circuitry...
  25. lattiboy

    Is this the Bose 1801 that will burn down my house?

    Hey all, In an incredibly spontaneous and stupid act of self-sabotage I picked up Bose 1801 that isn't producing sound. As I understand it, there are three versions. The later ones do not produce fires as often. How can I tell which is which? This one appears to have LEDs, which I believe is...
    • lattiboy
    • Thread
    • amplifier bose 1801 fire heat mistakes power amp
    • Replies: 17
    • Forum: Solid State
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