amp

  1. sean sweeney

    Question on 1959 Crown SXA tube amp power supply, switching noise from half wave rectifiers?? 120hz hum.

    So I got this amp in a trade deal a few weeks ago, and after one issue of basically building it back from scratch, from a blurry schematic from 1960, I still am getting some 120hz hum when the unit is idling, with the inputs shorted. I just replaced the selenium rectifier, and that seemed to...
  2. Racingh11

    Soundcraftsmen MTX S800 battery charger

    I needed a battery charger for a 144V hybrid tractor project I'm working on. I also have a MTX Soundcraftsmen S800 amp for parts. It is the same style as the old Soundcraftsmen PCR800, PM840/860 with regulated power supply. I needed the amp section to repair an S860, so I had everything else...
  3. R

    SAE MARK XXXIB distorted channel, then loud buzzing.

    Hey what's going on? so when I play music through the amp the left channel is distorted the right channel is clear. when I moved the amp, both channels went completely distorted and I had to unplug it, loud buzzing through the speakers and buzzing around the bad darlington area. I pulled the...
  4. J

    Peavey PVi 10 value and amp

    Hey there! I'm Jonathan, currently spending a year abroad in Canada working in a thrift store. I love music, especially loud and with good sound quality, I'm just not in touch with the technical sound of it... which is why I'm here. I wanted to upgrade our living room sound system a little bit...
  5. richardg0n

    Why Does 2325 Amp Have Full Voltage Readings W/O PWR Supply?

    I am troubleshooting a possible short on one of the 2325 amps connected to a DBT and only having one amp in the receiver. I have the RCA connected to the amp only. Can someone explain why I can take full voltage readings with my multimeter on the components without the amp power ribbon...
  6. 3.5mmjack

    WHAT AM I DOING??

    Okay so I'm currently running the following setup (follow me here): Echo dot 3rd generation 2018→ aux cable→ Fiio A1→ 2 way headphone splitter (everything from here forward is on both ways)→ 3.5mm to raw wire→DCM KX-6 The Fiio is a great amp, but it doesn't generate enough power (I think, idk...
  7. O

    Technics su-vx820 , improving sound ?

    Good evening, I have a Technics SU-VX820 amplifier, which I currently use in power amp direct mode, as it seems to sound the best this way, but I still feel like something is missing. I also own a Nikko TRM 750, but I'm not sure if it needs servicing (changing capacitors, etc.). The speakers I'm...
  8. D

    how to connect subwoofers to this audio setup

    hello i hope im at the right place here but im a bit stuck im planning to buy a schiit gjallarhorn and a pair of pro-ject speaker box 5 s2 to add to my setup but the gjallarhorn only has 2 speaker connections latter down the line i wanna add a subwoofer to the setup but im not sure how to do...
  9. M

    Information assistance for A Technics ST-K806

    Got this amp pre-amp combo, Technics ST-K806 pre-amp and SE-A808 AMP. looking into them the pre-amp is hard to find info or even listed for sale. I do see the amp, however, mine has no power button and most others do that I'm seeing online. Does anyone have info on these at all, have or ever had...
  10. redondo2018

    SAE Mark III / Mark Three meters fixable?

    So I recently got a one-previous-owner silver Mark III (with 2 meters and 4 knobs on the front) that cosmetically and audibly is pretty much as good as can be (all original), with the main issue that the meters seem to be completely dead (obviously any 50 year old piece of gear needs a recap /...
  11. M-Hassel

    Harman Kardon P725 | M770 Technical manual

    Good afternoon, I have a question regarding harman kardon models 725 and 770 for 100v. In the technical manual I could find, there are two versions only for 120v and for multi-voltage. Question, is there a technical manual for the 100v version of the P725 (HK725) and for the M770 (HK770)? If...
  12. Roman68

    I ask for help with the Technics SA DX850 receiver!

    Hallo . I recently purchased a Technics SA DX850 receiver. All functions work, the sound is clear, without distortion. But during operation, the receiver heats up significantly, and the fan does not turn on. Yesterday the receiver worked for about two hours, the radiator was hot, but the fan did...
  13. michaelm101

    Continuous Vintage Failure: Please Recommend New "Modern" Amp

    I still have my old Kenwood KA-5700 I was awarded for straight "A"s in the fifth grade and I have fond recollections of going to the Federated Group and Cal Stereo dreaming about other gear. I've since collected several other amps/receivers of the 1970s era of Japanese crafted stereo gear. BUT...
  14. I

    Recently acquired NAD C270. Recap suggestions/help? Want to extract its full potential.

    Hi everyone. I just bought a NAD c270 on Ebay. Seller says it's in good condition all good blablabla. Will get it here in a few days. I think it'll be necessary to recap the amp, plus maybe other components. Can somebody who has done this in the past share the list of the necessary caps? It's a...
  15. maskof

    Onkyo A-8450?

    Hello friends, I would like to hear your feedback regarding the Onkyo A8450 amplifier. Is it a good choice for peak performance, or should I consider alternative options?
  16. J

    Bookshelf Speaker Stands Necessary?

    Curious what you guys think about whether or not my set up would benefit from some short speaker stands. I have Kef Q350’s sitting on a very sturdy credenza. I also have a small space so very little/no room for tall stands on the side of the credenza. Curious if short desktop stands would...
  17. dswann01

    Marantz SM-7 Problem

    Hoping that some of you guys may be able to help with a recent problem. I have a Marantz SM-7 amp that I use with a Yamaha CA-810 integrated amp as preamp. While listening at very moderate volume this weekend there was a pop thru the speakers and an immediate drop in volume in both channels to...
  18. outrun

    First vintage system

    Hello all, I am currently building my first vintage system out of various parts I managed to acquire locally. I am a complete newbie to all of this, since this is almost my birth year hardware although I do have nostalgia towards these from my child hood. If anyone has any experience any of...
  19. J

    Old Rega Elicit vs new Brio

    Dear all, I'm looking for an integrated amp (to pair with new Rega Planar 3 Exact), and in my budget range I can choose between a new Rega Brio for around 700 euros, or there is someone living near me selling an older Rega Elicit for around the same price (incl. MM preamp) and that is claimed...
  20. Racingh11

    Soundcraftsmen PM860 / PCR800 power-amp restoration

    I bought this amp in rough shape as a project to match my other PM860 beater amp. I should have taken before pictures. The inside was coated in heavy dust that was also oily. And all of the black sheet metal parts had the paint pealing off. I opted to fully disassemble the amp. Ultrasonic...
  21. B

    Need to find VU meters for Marantz 500

    They say fs.. 200uA on the back.
  22. M

    Carvin V3 Hissing Issue

    Hello, I have a Carvin V3 stack. For months now it has a problem where it starts hissing out of nowhere, and it will do this whenever it feels like it. I've opened up the amp and tried fiddling with wires to see if I can get it to stop when it happens, with no luck. The only way I can get it to...
  23. R

    100-200watt Green-faced amps?

    Ok, I admit it, I am a sucker for the look of the green face Altec gear. Does anyone know if there is a 100-200watt version of the 1593B? Or know of a definitive list/site for these models. Just trying to put off Googling every model number/letter combo. Thanks. - Rob
  24. popeco

    Powering a Japanese Amp with a Stepdown + AC Outlet usage

    Apologies if this has been covered already, I tried searching but it's a tricky query. I've been looking at some older / vintage Yamaha amps from Japan, which are 100V / 50-60 Hz. I live in the US, so I understand that to power them here I'd need a 120V > 100V stepdown transformer. Which...
  25. J

    Is the preamp in Sony TA-F555ES any good?

    I use Sony TA-F555ES amp, which I think was once a very good amp, and which I love myself as well. It's time to send it in for some revisions (the wheel to choose between A or B speakers needs to be checked), but there is another issue that I'm not sure I should have the guy look at: the phono...
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