power amp

  1. D

    Pairing a NAD 3020 with a NAD 214

    Hello, anyone tried to pair a Nad 3020 with Nad 214? I would like to get a bit more punch from my setup and was wondering if this would be a working combination or if it will be more or less waste of money? I tried a Marantz 2252b in my room and it did alter the sound towards "fuller" but also...
  2. F

    Accuphase P-266 bias adjustment

    Hi everyone! I have changed all of the capacitors in this power amplifier, including the filter capacitors, as the old Elna's were very swollen. In addition, I've replaced all relays as well. I am very happy with the results! Now, I need to adjust the bias in the "Normal mode" (class AB) and...
  3. Myvinyl333

    Music Hurts My Ears

    I've been experiencing discomfort in my ears after a few minutes of listening at level 3 (going right) on my NAD 356 CBEE integrated amp paired with Triad Gold LCR speakers. The Triads are rated to handle 450 watts 4 ohms while the NAD provides 60 watts at 8 ohms. I've had various upgrades done...
  4. J

    McIntosh MC2505 or MC2002?

    I currently have a MC 2505 Power Amp paired with a C26 Pre Amp and a MR 74 Tuner. I recently saw a MC 2002 pop up for sale where I live. Curious if you guys have heard both the 2002 and 2505 and if so which did you prefer? Kind of curious if it’s worth trading for the 2002. If I did trade...
  5. khileman

    Sony TA-3200F Crackling Noises

    I recently got a Sony TA-3200F Power Amplifier. It is in great cosmetic condition but seems very original in terms of internals. I am having a few issues with it, and I have some experience with electronics and soldering, but not much, so I'd really appreciate some pointers. I have done testing...
  6. J

    McIntosh MR74 bulbs and MC2505 bulbs??

    Can anyone confirm which bulbs are needed for a MR74 tuner and a MC 2505 power amplifier? Would love to swap in new lights for both.
  7. 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!
  8. C

    Pioneer sx-737 bias issue max 1mV in one channel

    Hello, I found some really valuable info and help here, but I suppose it's time to start my own thread. I'm stuck for 3 days straight and frustrated to the moon. I got a SX-737 unit with fried transformer (secondary for full wave rectifier, pins 3&4 on the ps board). It's repaired now, but I...
  9. H

    Yamaha P2200 power amp - meter and lights cut out

    Yamaha P2200 power amplifier. The right channel’s huge meter and its lights cut out occasionally. A tap or two on top of the amp fixes things. I’d like to enjoy a more permanent fix; can anybody pinpoint where to look for a poor (solder) connection? Also, I remember hearing that the black...
  10. S

    Adcom GFA5800 Power Switch LED is out

    Power LED on Adcom GFA5800 is out. How to replace, what part, etc. Thanks a million to anyone who can help!!
  11. Schmurpy

    Hitachi HMA 7500/8500MKII power meters needed.

    Hello, Hitachi HMA 7500/8500MKII power meters needed.
  12. W

    Carver PM-350

    I am working on a Carver PM-350. The only schematic I can find online is low res and hardly readable. Does any generous soul out there have a better schematic, and will share it with me? The board layout drawing would help too. A ledgeable trace side drawing would be great too. I want to fix...
  13. Kim Beneteau

    SX-950 Low output amps

    I've recapped all boards except for the tuner. On the bench I'm running a couple of mini JBL surround speakers to check for sound L/R operation. All seemed good, dragged it upstairs and hooked up to a pair of Infinity P363's and good clear sound. However, it seemed odd that as I turned up the...
  14. Engel

    What to pair with an old Mosfet power amp?

    Lucky enough to pick up an old power amp for only $30. Guy said it was used for parties, events, etc. He said it turns on but he hasn't tried it with speakers so who knows. It's a Mosfet amp rated at 300 watts (per channel?) according to the label on it. Made by an Australian company called...
  15. James Cox

    Marantz 240 possibly blown

    So my friend called me up today and was very distraught. He purchased a Marantz 240 and 7t preamp a few months ago and was experimenting with some separate phone preamps he had. The problem came when he was switching around the phono preamps with the amp and stuff on and accidentally hit the RCA...
  16. James Cox

    Scott LK-150 restoration thread

    Hey everyone! Ive finally decided to do a full restoration thread from start to finish after scoring a good deal on a Scott LK-150. I've ordered the parts and have most of them on hand but still waiting for some stuff from Jim Mcshane. The amp came without any tubes but I've got some lined up...
  17. James Cox

    Kt-120 compatibility with Scott LK-150 tube amp

    Hey everyone, I'm in the process of picking up a Scott LK-150 but unfortunately it has no tubes. I was wondering if anyone here has tried KT120 tubes on this amp or of they draw too much current to be safely used here. When it gets here this piece is going to need a decent amount of work before...
  18. Racingh11

    Adcom GFA-565 service

    I finished restoring a pair of these amps. They both had DC offset issues among other things. After messing around with the original board on the first one, I found it had current leaking into the DC servo opamp ground reference. I removed everything from the trace and it was still there around...
  19. D

    Capacitor diameter to small for socket

    Hi, I ordered caps for recapping my Sansui AU555a and based my order on a list here: https://audiokarma.org/forums/index.php?threads/au-555a-recap-list.622667/ Now, the caps for the power amp do not fit the sockets/fittings (see photo), the ordered elco's are slightly smaller. As these caps...
  20. MarmotDavid

    What to drive new Magnepan 3.7i's

    I've got a new pair of Magnepan 3.7i's. Currently I'm using my older, unrestored Counterpoint SA-1000 tube/hybrid preamp and and old solid-state Conrad Johnson Sonograph SA-250 power amp. The setup sounds pretty good but I'm sure it could be improved with some newer preamp and power amp, so...
  21. N

    Looking for amp to power JBL B460

    I recently acquired the monstrous JBL B460 18" passive subwoofer. This thing is the size of a small refrigerator and can take up to 800W. I do have the accompanying BX63A active crossover. I'm looking for recommendations on what to power this beast with. New or vintage is fine. Budget about $1k...
  22. H

    Yamaha P2200 hum

    My P2200 was recapped by me and has been performing beautifully but has just developed a hum. Diagnostics listed below. Please can anyone suggest the most likely cause and likely location? All input sources disconnected, the hum is present. Hum can be made louder or even disappear, by rotating...
  23. H

    Help!! Old stereo equipment value/appraisal

    Hi Everyone! Please bear with me as I have no audio experience at all. My uncle died recently and left me a ton of old electronics. I am looking for help in trying to figure out what these pieces are worth. If anyone has any idea I would greatly appreciate any insight you can give me! I have...
  24. Racingh11

    Soundcraftsmen input board

    I designed an input board for the Soundcraftsmen PCR800, PM840/860, and similar amps. It will also work on the A5002 or most amps in general with the correct power source. It uses the built in +/- 15V supply in the PCR style amps. It provides a buffer for the input to the amp and will accept...
  25. A

    upgrade amp for Sopra 2's

    I just acquired a pair of Focal Sopra 2's. Awesome speakers. I'm currently using a new Rotel 1590MKII preamp and an Anthem MCA power amp. I'm looking for advice on upgrading the amp. Since I just got the preamp, I really don't want to replace it. I've been looking at the mac 312 and Parasound...
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