hk

I recently picked up a Harman Kardon A401 to use in a stereo console project I am working on. I have some background with soldering and repairing things if I have clear instruction but have not gone deep enough into stereo gear to know how to diagnose/ trace down trouble spots. I replaced the...

Hi Gang, I grew up cutting my chops on HK, so now I'm acquiring some older pieces to enjoy. I bought a HK 825 preamp. I have a great vintage repair guy in my locale. But-- we keep hitting glitches. I told him I would help to find a Technical manual, but...he's wanting the real printer paper one...

Hi, I'm very new to tube audio and I'm feeling like I'm in over my head. I learned how to swim with my father throwing me into the deep end of the pool, and that's stuck with me ever since. Anyway, I can't find anything about this issue even after extensive Googling (probably not using the...

Hi everyone, Recently got a new to me Harman Kardon HK 450 that works pretty well except for problems with the bass. It essentially has no bass response at all, and turning the bass up does nothing but give a big pop at about 80% of max. This unit did get pretty beat up in shipping thanks to...

I recapped the tuner on my HK 730 Twin - I was careful to ensure every cap was oriented correctly the right value. What's the best course of action to track down the issue?

I picked up this 630 Twin Powered receiver about a week ago, along with the Concept 4.5D pictured with it (not pictured is the non-functional 4.5D that was also included). The HK is in near mint condition cosmetically, other than needing a little cleaning. Functionally, it's also good, other...

Hi guys, this is a list of transistor I have in HK CD-401 deck It suffers from low record/playback level I have found and replaced leaked caps ( 10mFx16V and 1mFx50V ) I also found that 2x2SC2878(B) in rec-mute circuit were partially opened all the time regardless of button ( at the moment they...

Noticed subpar FF / RW performance of the deck. Took apart the tape mech and this is how idler tires looks like, is this salvageable or I have to order new ones? If I have to order new ones what are dimension I have to look for? Or course I can remove then and measure, but I prefer not to tear...

I was more or less looking for a vintage tuner, because I like the look. So I came across a harman kardon F500X that went a got for a song, is missing tubes and is going to be a project for sure but I'm up to the task. I have 50 % of the tubes here already. So I hope I can get it fired up next...

The fourth era of Harman Kardon's solid state stereo receivers were the Twin Powered series: This thread is a guide to those models, their specs, and pointers to schematics and restoration threads for each. Note: If you have additional information on any of these models or have a great...

The third era of solid state stereo receivers from Harman Kardon centered around the 330A and 330B and the clones made by Roland and Soundcraftman: This thread is a guide to those models, their specs, and pointers to schematics and restoration threads for each. If you have additional...

The second era of solid state receivers from Harman Kardon were (what I call) the Nocturne series. This thread is a guide to those models, their specs, and pointers to schematics and restoration threads for each. If you have additional information on any of these models, send me a private...

Hello! A few years ago I got bitten by the linear tracking turntable bug. There's something exciting to me about seeing all the different ways that various companies solved the problem of tonearm movement. The HK/Rabco design is one of the most interesting to me, in all of its low-tech glory. I...

I have two ST-7 Turntables and may have made a mistake. I removed the Tracking Rollers from both of them to realize the rollers are not symmetrical. Upon measuring them I discovered one side (axel) is longer than the other. One axel measures approx. 6.6 mm and the other axel 6.8 mm, so there's...

hey guys it seems like there is little information available on Harman Kardon turntables. I am specifically interested in what the differences are between the ST and the T series turntables. From what I could gather from the pricing on eBay, ST series seem to be more expensive than the T...

Hello. I bought a H/K PM660 not too long ago and I have been enjoying them ever since I got them fixed. Over the last few days though I noticed something peculiar. The right channel wouldn't work when it's set to stereo. When I set it to reverse, the right channel works, the left channel does...

Decided to grab a TA-230 yesterday for a decent price. It needs to be refurbished. Caps, tubes etc etc. Not a bad sounding or looking receiver. Though the phono preamp is nowhere near as nice sounding as my 340b. Maybe once fixed up that will change. Wish it had the third speaker output, but I...

Like many, I'm always looking for a new project to add to my others! Over the weekend, I found a local guy liquidating his 'collection' due to downsizing his living space. I picked up a couple integrated amps - HK A230 and A300 (A30K, actually). Both are very good to excellent cosmetically...

I must start this thread with a gracious thank you. I've gleaned so much from this forum that it seems fitting that I give back with a small post of success. Most of these solutions have been suggested by others on this forum and so have made this possible. I will simply post what I have done to...

Hello everyone, Someone near me is selling a Citation II for $750. Cosmetically, it's quite beat up, and it's not currently in working condition. However, the seller guarantees good transformers (and he's tested them properly with AC). It also comes with all tubes except the outputs...

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...

My new-to-me Citation 19 amp has the characteristic turn-on/turn-off 'pop.' It's only mildly annoying, but I'd like to see if there's an easy-peasy way to avoid this (short of dropping $300 on the Eminence D-fend.)

When I power the unit the am and fm has no sound initially. A couple minutes later the sounds starts to increase. Then after a couple power on/off's the sound is fine. All other functions/switches/inputs work fine. It is 70 degrees here now. The problem was worse during the winter. The...

Hi all, thanks to @dlucy 's many incredible threads on the topic, I have begun the process of restoring a non-functioning 330b that I purchased for cheap. I have replaced the majority of the components on the main amp board and gotten it working with one caveat: the chassis seems to be 'hot'...

I've recently purchased a Harman Kardon RABCO ST-7 and am looking to replace the belts. Are they both the same? If not, any suggestions for a good reliable vendor to purchase these from and know I'll get the correct size belts. I've purchased belts for other turntables and found that if I didn't...