recapping

I have a rack consisting of a marantz 3250b and 300dc, and the left channel cuts out. It goes silent while the right continues to play music, until I turn off the speakers, max out the volume until the vu meter starts showing something, lower it again, and turn the speakers back on. Doing this...

HI Everyone, I am new to this group and new to the world of vintage audio upgrade and repair. Not an EE but strong technical background in other disciplines so I can usually figure things out with some reading and support. I have gotten reasonably comfortable with speaker crossover upgrades...

I received such great advice on my last post, I figured I’d try this on y’all. Can anyone identify what this is? It’s feels like ceramic but the markings show are all it has. This place is great. I owe you guys a beer.

Hello AK, This has been discussed before by other members in similar situations, but I felt that due to the rarity of these speakers and the number of differences between varying serial numbers, a separate post might better help others in the future. BACKGROUND: *Feel free to skip if you’re...

So I've been thinking of doing a a recap for my AU-D11, it sounds amazing but is full of black flags and has an electrical smell (for other D11 owners: is that normal? My D9 produces no smell whatsoever). Anyways as the date of parting with the amp approaches I've found myself having second...

I'm restoring a Kenwood KR-5600 that was in working condition, at least I know the FM and the Tape inputs were working, and I started with the power supply. The KR-5600 has a history of heat problems with its design, so I boosted the clumped resistors to 3 watts and the caps to UPW 100/50v...

I'm restoring a Kenwood KR-5600 that was in working condition, at least I know the FM and the Tape inputs were working, and I started with the power supply. The KR-5600 has a history of heat problems with its design, so I boosted the clumped resistors to 3 watts and the caps to UPW 100/50v...

I have a Pioneer SX-880. It was bought a year ago for $125. It needed some repairs which cost about $225. There was no recapping of any sort, just a bad channel. I also have a Luxman R-115 a friend will sell me for $200 with remote. I have been using the Luxman for over a year (nice friend) and...

Good Afternoon. I am looking for recommendations on a rebuild/restore service for my AU-717 amp. I bought this system when I was in the Air Force back in the late 70’s. I did a short tour in Korea and like a lot of other service guys back then, we all got big stereos for our rooms. I picked up...

Trying to find a replacement tweeter for these guys, and decided it was a good time to re-cap. Problem is the circuit board (on which I assume the caps are located) is inside the front baffle, and for the life of me, I can't figure out how to access it. There must be a trick, right? Anyone have...

So I have a headphone tube amp I've been tweaking and noticed 4 of the 6 larger electrolytic caps were bloating. It's about 12 years old now and comes stock with Rubycon 470uF 250Vs. While I'm sure I can get away with just leaving it a few more years, many recommend recapping after 10 years or...

A good friend has lost his mind and decided to try his hand at restoring vintage stereos... and this is what I showed him what to do... to recap and restore the Kenwood KR-5030 stereo receiver he found, for cheap, at the local used record store. And his pictures after he cleaned it up and...

The full question is, "do Darlington Power Packs Age like dedicated output sections"? I have a JVC JR-S201 with dual darlington power packs in the output stage (one per channel). I've owned the S-201 since new (1978) and it was doing yeoman duty with one of my sons in his stereo set-up. Went...

I'm currently rocking a Pioneer SX-50, which works and sounds great. It's almost 40 years old, and I'm wanting to replace the filter caps just for reliability reasons. I have a pair of Nichicon's coming in next week, and I've heard about AK'ers adjusting their bias after a recap. Should I be...

Please excuse my ignorance, I'm new to the world of recapping vintage receivers. I have an original Pioneer SX-50 that's getting up there in age, and I'd like to start by replacing the main filter caps for good measure. They're a pair of Nichicon 8200uf 50v caps with an 85c rating. What would be...

Just to keep everyone guessing, I only replaced the electrolytic caps in this Harman Kardon 330A instead of replacing everything I could desolder. ;) For those of you who just want to do a minimal recap and you have the matching 330A, then this thread should help find the right parts to return...

One of our outstanding local AK'ers, @nj pheonix , asked me to recap and restore his monster-of-a-receiver Heathkit AR-1515. It is quite a beast, lots of power, an unusual design (on the inside), has the rare Dolby FM card, and was a lot of fun (read as "learning experience") to work on. This...

@sfox52 asked me to recap his hk 730 twin series and since finishing that last week, someone else is asking for the recap BOM, so I'm posting that part quickly here and I'll fill in the details and the input-panel-repair and ps-for-LED-pointer-replacement goodies when I have more time. Index to...

@BillWojo has this really smart perspective on his favorite vintage gear: "if it has proprietary or unobtanium parts, insure it by recapping as quick as possible"... or something like that. He asked me to do a quick recap on his Yamaha PX-3 linear turntable and it went pretty well... with only...

So I got my hands on a DP-47f back in september as a birthday present. I had to chase it down since turntables are very expensive here in Argentina, and, since this is a somewhat hifi and rare model, more so. The deck itself has only cosmetic damage (ie: Some minor scratches here and there, and...

Hello Fellow McIntosh fanatics! I am currently working on Restoring my first MC240. I have already gone through the PS Section and am currently measuring all of the Carbon Comp resistors and Capacitors. There is some debate o whether to leave the Red Lettered .22uf 600V Black Beauties in or not...

I am recapping a pair of MC60 amps for a friend and the serial numbers are 3XXX and 7XXX there are lots of differences between these two amps. The board layout is completely different and the bias section is different as well. The first amp I replaced the selenium rectifier with silicon and...

Hi folks - I'm preparing to do my first recap and I would appreciate any tips on desoldering the old caps from the pcb boards - I'll be working on an old magnavox solid state receiver. questions: When removing the caps, will I just heat each lead and wiggle it out of the pcb hole? Does it take...

So, recapping. It's often advised for old gear, for obvious reasons. I've done it before, to varying results, mostly good. I am good with the careful selection and replacement of caps, but I lack the knowledge of the principles of electrical circuitry and amplification that will ensure that I...

Dear All, I have a recently required 2270 that has been "almost entirely recapped" by it's previous owner, who claimed to be an electronic tech. Certainly the main power caps are indeed new, I didn't take it apart in detail to find out more.... On line and tape inputs (incl digital sources) it...