Recapped amplifier circuit
Recapping Meridian Hi, I'm starting on a recapping project on my Meridian However, I haven't done that much work on hifi amplifiers and I've never tried to remove an amplifier board from a 5 pound heat sink. On the , the main circuit board similar to the Alex MM circuit board in "The Very Best Amplifier I Have Ever Heard" thread has 4 power transistors Toshiba 2SA on the top and 4 on the bottom configured to lay flat on a heat sink that the board is attached to. Each of these power devices has a very thin custom square of heat tape attaching it to the heat sink along with a single hex screw. There are other devices on the heat sink, some with heat tape, some with thermal compound but the power devices are the only problematic ones.
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The full story on “re-capping” a Naim power amp
Messages: 4, Likes Received: I have a Lab Series L11 solid state amp I picked up over the summer. I love how it sounds, but, beyond the power cord having been replaced with a 3 pronged cord, I don't know if it has been serviced in the past and it is at least 33 years old.
Necris , Jan 8, Messages: 5, Likes Received: A tube amplifier getting "recapped" is typically to replace the power filtering caps. When those got old, hum gets bad. Honestly, I'm not sure if SS amps have a similar filter cap setup.
Any eloctrolytic cap has a finite shelf life though. Tho the usable life can be pretty long, their optimum life is only about ten years. Mordacain , Jan 8, Messages: 1, Likes Received: Technically, you don't recap anything unless the ripple is bad enough to warrant it. But this is not really the case or followed. The cap life really depends on the type, when it was installed, how long of it shelf life it was stored ahead of installation, and is more about performance characteristics.
Generally bad caps are going to sound bad regardless of their age. Older caps present worse performance which is a different ballgame - you're re-capping not for the sound but for proper operation. Normally when a circuit is recapped, you're SUPPOSED to check every single electrolytic used at the time of manufacture and check for proper operation. Not just filter caps - all electrolytic caps exposed to some form of voltage ripple reduction - as solid state or tube applications doesn't matter.
If the original caps are still in the amplifier after 33 years and the amplifier sat for many years without being played, I can guarantee they will need replacement. If it was played regularly and at OK volumes, they may still be fine once checked. If they were abused with heavy low notes and loud volumes at all times, then they will also need replaced.
There is no sure date - it is something that is beyond service dating and more for stability. Quality of sound improvement is just an added benefit or byproduct. But I will say that for added assurance it would not hurt to replace them regardless. Preventative maintenance is always a wise decision and where the original assumptions of "after X years" comes from.
Messages: 8, Likes Received: Take it to a good amp tech for some peace of mind. Harry , Jan 8, Messages: 3, Likes Received: If there's not a lot of background hiss, noises, or lack of omph, then it's your call.
You can go on with the 20 year suggested recap that most people give, or roll the dice and keep on truckin'. But to answer your question, yes. Solid state amps will benefit just as much from a filter cap job as a tube amp. Like glpg80 said, look at all the electro's in the amp. This includes the signal path especially.
Thanks for the info guys. I'm going to go ahead and have it recapped. You must log in or sign up to reply here. Show Ignored Content. Share This Page Tweet. Your name or email address: Do you already have an account? No, create an account now. Yes, my password is: Forgot your password? Search Media New Media.
Capacitor Replacement
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To Recap or not Recap?
LOG IN. I have a Musical Fidelity Acr power amp that I bought new in It has been an excellent performer. I was thinking it might be time for a recap and was wondering what you all might suggest. I opened the top and none of the Jamicon caps are bulging or leaking. So, I'm not sure a recap is even needed. However, if it is, should I upgrade as opposed to a stock replacement both the output and power supply caps? If so, what brand should be used? Edit Delete. Hi OP, I think you are a little early for a recap, and by the time your amp was made capacitor quality i.
Recap My Plexi?
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Nad 7020 recap
I ain't gonna lie. You won't be a master troubleshooter after reading a couple pages here. Hopefully, what I can do is give you the ability to form a logical plan of attack. From that comes self confidence, knowing that there is a deterministic way to solve problems, without a lot of trial and error and without resorting to the dreaded scattergun approach of random part swapping. Troubleshooting is done mostly with the mind, not with the soldering iron.
Recapping Rotel RB-850s
Log in or Sign up. Marshall Amp Forum. Recap My Plexi? Trapland , Mar 7, Joined: Mar 5, Messages: Likes Received: Kats , Mar 14, Trapland likes this. Joined: Mar 23, Messages: 9 Likes Received: 0.
Solid State Amplifier Recapping
In recent months I got back into just listening to music, no distractions, just enjoying it. I settled on a NAD receiver I found in the local ads. I had the e version years ago and liked it and these amps have an excellent reputation for their power amp, the highly acclaimed and their phono preamps. The is basically a with a tuner added to it.
Mail-In Service - Janus / Peterson Rhodes Preamp
November 17, , PM Welcome, Guest. Please login or register. Member Offline Location: Australia Posts: Is recapping a must do.
What's Available for Repairs Unfortunately, the selection of high voltage electrolytic capacitors today is both smaller and different from the past, so chances are you won't find an exact replacement for your original equipment electrolytics. For low voltage applications, like cathode bypass capacitors, most vintage types have an axial configuration, which is less common today but still available. The more modern radial configuration can also be used if their leads are long enough and they don't violate your notion of aesthetics. More problematic are the high voltage power supply capacitors, usually multi-sectioned aluminum can types mounted on the chassis top plate. By combining small size and very low cost per unit capacitance, electrolytic capacitors hereafter called electrolytics are the only cost-effective choice for high-value applications like power supply filtering in most consumer gear. However, electrolytics cannot be used for AC voltages that is, no polarity changes allowed , and compared to other types of capacitors, their electrical characteristics are abysmally bad.
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