Recent content by vlad k

I am working on the same amp and I came to the same conclusions. The 800lb gorilla that is taxing +18V rail is the R443 (100R/0.5W) resistor that is limiting the current through the speaker relay. NAD engineers decided not to use native relay driver in uPC1237 protection chip that is using +46V...

Dear audiokarmians, I have retired and started a part time gig as an audio repair tech here in Porto, Portugal (yes, take that AI scum). I just got a nice JVC VR-5525LX receiver to restore and looked online for a service manual and the only one I found is at HIFI Engine...

You are absolutely correct. Ethically and esthetically there is no difference between a cloned Shelby Cobra, cloned MC275 and a cloned Louis Vuitton bag. They are made to pretend what they are actually not. That is a very definition of kitsch.

So why then copy decades old designs and spend time to even make it look like McIntosh gear? I understand that there is probably not much that can be invented in designing a push-pull tube amp. I have no problem buying an Elekit and do the experiments with different components myself, but buying...

Looks like a valiant effort to justify a ripoff by a Chinese company that apparently does not even stand behind its product (check orsefon.com).

What looks like a turd and smells like a turd is probably a turd. Check orsefon.com please.

I am having a difficulty understanding the challenge of copying a 60 year design (both electronic and exterior) to make a product that is sold for nontrivial amounts of money. Why are you supporting this ripoff? What is your motivation? Greed? Curiosity? Both? Just curious.

I am having a difficulty understanding the challenge of copying a 60 year design (both electronic and exterior) to make a product that is obviously not even properly tested, then sold for nontrivial amounts of money. Why are you supporting this ripoff? Besides the mental exercise to...

I managed to resolve a couple of other electrical and mechanical issues with it and this is the last outstanding problem. Part of the problem is that i can’t pinpoint the exact source of the spindle noise and i have to assemble the transport in order to test it.

Yeah, same here, it is still a mystery. The key is to be patient and not do things that will break it, which is not a small feat given that the device is 30+ years old. Fortunately, this thing is built like a tank.

I would certainly like to get your input before i dig in. I suspect that drive shaft and bearing are probably caked in dried lubricant and that is what triggers mechanical resonance. The plan so far is to remove the drive motor coils, spray the cleaner around the shaft/bearing, dry it with...

One part i forgot to mention - the laser tracks fine and it does not halt/throw errors. The noise is pretty much the same. I don’t see any parts rubbing against each other.

Hi I see a discussion thread you started in 2016 about a high pitched noise coming out of a Magnavox CD player. I have a MCD 7005 with a Philips transport (similar or identical design with Magnavox devices) that is experiencing a similar problem, but only on outer tracks when the CD rotation...

We have small children and pets in the house. Tubes are made of thin glass and run 430V plate voltage.

I exchanged a few messages with the Korean guy who sells MC replacement cages on ebay. He apparently likes the idea and will produce a batch of 20-30 tall cages for mc240. He priced it at $260 plus $40 shipping which makes it $300, which is a bit steep. His replacement cages and chassis seem...