power amplifier

Hi everyone, I'm hoping someone here has run across this before because I'm starting to think my Model 140 is a production revision that doesn't match the commonly available service manual. I've been troubleshooting it methodically and trying to avoid replacing parts without evidence, but...

Doe's anyone know if pages 25 The power amplifier assembly pages is correct in regards to the emmitter side of Q425-Q431 .I have a conflict. Thanks in advance l am getting the wrong voltages on channel 1. I thought it would be the same configuration as channel 3. Thanks in advance.

Hello all. I've finally started a JVC M-7050 restoration, and have decided to document the process here because I anticipate a long and challenging journey. The unit came from eBay and, luckily, was not damaged during shipping (in contrast to a JVC P-3030 received some weeks ago that was badly...

hi all first post here so please dont judge :) So im trying to convert a motherboard failed yamaha avr to a power amp just by using its transformer, amp boards and speaker terminal board ?( dont know the name of this board) all advise comes in handy . First question can i connect line in signal...

I made a post a few hours ago about getting the bias correct on my ta-n80 amplifier. I ended up setting the bias after the amp had fully warmed up and everything seemed fine, it kept the bias well and didn't do anything weird. So after this I turn it off, go to test it and get no sound. I tried...

Hi everyone! I completely recapped the Accuphase P-266. Once the amplifier is on, it runs great! But charging 4x 22,000uF filter capacitors causes a high inrush current. Every time I first start it, the circuit breaker is trips because the inrush current is too high. This also happened before...

Hi all, so I have been doing some preventative maintenance on my Marantz 250M which seems to work well however I have noticed the left channel has many resistors that test low in circuit compared with the right channel - when tested out of circuit all these resistors measure fine. what could be...

I'm looking to hear about other enthusiasts' experience with hooking up amps and preamps from different series or different manufacturers etc, as opposed to the matching designated pair. I've heard good things about putting a tube preamp with a powerful solid state amplifier for instance...

I am using a Marantz 1060 as a preamp and a Niles 2100 (2 channel) power amplifier to power 2 Elac DBR-62 speakers (100w 8 ohms). I'm adding 2 more Elac speakers and running them into my kitchen which is adjacent to the den where the Marantz/Niles are located. The Niles 2 channel power amp will...

I have used a NAD 3020i as my amp the latest 10 years. I have not found any amp that can match its details and treble. Though, since trying a NAD 319 dedicated power amp in my system I realise that the 3020i lacks definition and power in the lower frequencies. I wonder if anyone has a...

New user and first time poster here so go easy on me... ;) So, I have just bought some Altec A6's second hand in good condition. They came without a crossover so I am going to be using the Behringer CX3400 as an external crossover and horizontally bi-amp them, as I have heard people had good...

HI, I have dozens and dozens of switches laying around of all different ratings and I was wondering what the ideal rating would be for voltage/amps for a on off power switch for a marantz model 32 power amplifier. Thanks

Hi all, I just bought a Hitachi HMA-7500 mkI power amp, have looked on the usual sites, have downloaded the service manual but can't seem to track down the user manual. I know it's probably not really needed but I'd still like to have it. Does anyone have a PDF of one I could maybe get a copy...

I have the chance to get one or two of these for free from an old movie theater. https://www.qsc.com/resource-files/productresources/amp/discontinued/mxa/mx_1500a/q_amp_mxa_mx1500a_sepcs.pdf Just looking to add some dynamic range to my current setup. I currently have two integrated AVR's. A...

Ever since restoring and listening to the Harman Kardon hk770, I have been an extremely avid proponent of them. I can't recommend them enough to people looking for a relatively cheap power amplifier that can drive efficient tower speakers, bookshelf speakers, and even headphones with ease...

Hi all, I'm trying to repair a Luxman L510, I've found that two of the four power transistors for one channel are damaged (short between B and C), it uses the 2SA1075 and 2SC2525 complementary pair, can someone suggest a recommended complementary pair, even in a different package? I can find...

Hi, Iam trying to build an amplifier came across Stochino amplifier (attached circuit, improvised version and related documentation). Want to know if anyone has tried this earlier, if so how is the sound signature and overall performance. Also DIY gurus kindly analyze the circuit and suggest...

Hi I'd appreciate some suggestions on an amp I'm working on. Works well, sounds good but there's some DC offset and no manual or schematics available. Background: The amp is made by an Australian business called Audio Assemblers Pty Ltd. Some of their stuff is reputed to be PA-grade but...

Anyone have experience with this power amp? Have the opportunity to pick one up for what seems like a good deal - about a buck fifty. Was told it was serviced a couple years ago, come to find that means a fuse was replaced, it was cleaned, and tested. In addition the description says one of...

Hi all - I’ve been looking for a power amp upgrade for my ELAC B6s for a stereo listening setup and have come across and Adcom GFA 5500 for $150. I don’t have pictures yet but the seller says it works well, just a couple front panel bulbs burned out. Is this a good deal? He’s selling other...

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...

Hello fellow AK'ers. I need help with this resistor value please. My eyes cant distinguish the color on one of the bands therefore I cant order the resistor. Any help would be greatly appreciated. I do have a picture of how to look up resistor values but I the problem is my eyes wont cooperate...

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...

Title pretty much says it all. I purchased a nikko alpha 230 power amp off marketplace as is since it seemed to be in very good shape and not abused but when I tried to turn it on at home instantly the protect light went on. I checked visually if there were any burnt resistors and fuses but no...

I have a pair of Cerwin Vegas 12", they're rated for 300 watts max and I am considering getting a Yamaha A-S500 to drive them. The Yamaha s500 is only rated for 85 watts x2 unfortunately. I'm looking for something below $500 in order to get decent sound quality and volume, ideally a Yamaha since...