Recap old amplifier connections
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Maintenance of an old but very good Amplifier
My real old Adcom did that and my has started doing too. From the sound quality perspective, both amplifiers have much softer bass now as compared to when they were new which makes the overall sound rather flat and lifeless. Both have been used actually abused on a daily basis since by me and friends who still borrow the for parties.
LOG IN. I was wondering how you would know its time for a recap on your amp. Even when it sounds fine and the caps are not bulging or leaking. Edit Delete. Depends on age and thermal stressing. Ie, how hot the capacitors have been throughout their time on this planet. Capacitor wear is primarily a time and temperature issue. When used in pulse power supplies, the max ratings on current or amperage of the given capacitors, then those can come into play in the issue of aging.
Capacitors have specs, like a max rating, and then age related data under those max conditions. Capacitors in pulse power supplies, or in class d amps, are 'hit hard' continuously. Kinda like running a engine that has a 7, rpm 'red line'..
Maybe a day or two, for the engine. If it makes it that far. Kinda like beer storage. Generally, anything over approx years of age needs to be assessed. Depends on the specific example. Ie, digital or class d amps, which are always over stressing their capacitors in their power supplies. How many horror stories are there of year old subwoofer amps that are broken?
Those are built to last, in design and execution of the build. Modern pulse power supplies are junk, in the realm of longevity. Note that It's a case of quality drift being fast and high and a short lifespan. Which is perfect for the big corporate game, the end point and short lifespan is built right in, so you can get on to buying a new model in fairly short order. Pulse power supplies have crept into so called 'high end' gear, and I'm not sure it's a good idea at all.
If you start hearing a hz hum when only the amplifier is on, then it is time for power supply caps to be replaced. Prior to that, you may hear a softening of the sound transients and mid to lower bass.
If the amp is running and sounds normal, leave it alone. I agree I recapped some old speakers and never felt they sounded quite the same. Recapping loudspeakers is a thing that must be individually assessed in how it is done.
Small bypass caps of a film type sometimes works across electrolytic types , but if the crossover is originally all electrolytic, then the new should also be all electrolytic - unless one wants to get down to redesigning the crossover.
Let's assume; You have a family car with timing belt, that according to the owners manual is supposed to be changed every 7 years or , miles. Your car is 6 years 10 months old and has 70, miles. It was not a taxi, was cared for, and was not abused.
Timing belts give no warning signs before they go. Are you going to get the timing belt changed in two months? Sounds like you are indeed close to that timing belt failure moment.
The point of my references was, that electrolytic capacitors do. Of course: to many, " One's course of action, will depend on how much they value performance different strokes As with timing belt, replace before it goes. Before that, you will have lost some dynamics, of course.
Teo - Regarding my speaker recap, the capacitors and resistors were approved by the original desiger. Sonic caps and mills reisistors superior to originals used in the 80's and 90's but it did change the character of the sound for the worse for me anyway. Log in to respond. Naim Recapping. D-Sonic M3a
The Amp Garage
The operation requires a bare minimum of knowledge and tools. Disclaimer: be carefull when servicing audio equipment, always unplug from mains and discharge capacitors after opening the device. Example on the famous bad batch in some Technics gear. What will be covered: Why capacitors age What are the risks presented by old caps Which capacitors we need to replace When we need to replace them Tools required Knowledge required What parts to use and where to source them Disclaimer: be carefull when servicing audio equipment, always unplug from mains and discharge capacitors after opening the device.
Yamaha MX 1000 Recap Kit. All top quality electrolytic Capacitors
Second only to power cords, capacitors are the most failure-prone components in old radios and televisions. In a professional overhaul, it is common to replace all of a set's large electrolytic capacitors and small paper capacitors. This article explains how to do that. Often, this "recapping" is all that the radio or TV needs to be restored to health. Incidentally, tubes are much more reliable than capacitors. Many tubes will last for decades. Professional restorers replace a tube only if it is defective. These photos show the underside of a Grundig W radio before and after recapping. The second photo shows the capacitors that were replaced.
Recap and Restore
Thoughts on Atom vs Nova? I assume a unit without HDMI could still be rigged up with an adaptor? I guess they may not be as bomb proof as the classic line but pretty reliable still I think. Well, I generally build my own gear, so always take my advise with a big grain of salt.
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Moderator: Alan Voorhees. Users browsing this forum: dabcckoq, Google [Bot] and 3 guests. Magnavox recap Discussions of phonographs, records, jukeboxes and related topics. Ads are not permitted. Magnavox recap by electra » Jul Thu 28, pm I have decided to change all the capacitors, check for out of value resistors, etc. The stereo seems to work okay, so I don't have any specific concerns.
Re-capping older amplifiers
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My real old Adcom did that and my has started doing too. From the sound quality perspective, both amplifiers have much softer bass now as compared to when they were new which makes the overall sound rather flat and lifeless. Both have been used actually abused on a daily basis since by me and friends who still borrow the for parties.
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When the re-capping service was initially established in the s it was a relatively simple job, comprising a mere ten electrolytic and tantalum type capacitors caps. The amplifiers that came in for service then were around five years old, so no other work appeared to be needed. These days, those same amplifiers can be up to thirty years older! Needless to say, they require extensive reconditioning throughout. The current rebuild service involves up to eighty 80 key parts. The picture below shows a set of NAP boards stripped of those parts visible in the white container. The new parts, inclusive of a variety of capacitors, resistors, transistors, and diodes can be seen in the black tray, before being fitted to the rebuilt boards as seen in the bottom picture.
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