Richard, Mike and All, For those of you wishing to explore the testing and alignment of tuna's, I have some suggestions. For starters , there are some industry standards for testing audio products suc

Yeah, Sounds about right. I try to make a point of not throwing well intentioned but inexperienced techs under the bus. But then , there are the puffers and braggers who in reality don't care or know

Re T85 mods, The dollars sounds right to me. But two weeks turnaround time sounds like a man with no work. My business associates , and some are friends , are typically telling customers here in the n

To All, Yes aged germaniums can indeed get cranky, exhibiting a variety of less than ideal operation characteristics. I found a fellow on e bay selling AA118 in the original factory package. A good nu

Kevin, I have had conversations with a local station engineer due to a related experience. In my case the audio improved significantly. I first spoke to the station manager and then their engineer. Ma

Mike , I quite agree with Bob’s comments about test equipment. There are so many choices and sometimes a inappropriate purchase can lead to lots of disappointment and frustration . This hobby is suppo

Victor, The T-100 uses the Motorola mc1310 decoder as i recall. The Accuphase implementation of this very common MPX decoder IC is very well done. Past experience has shown that the typical T-100 ster

Hi Victor, A few comments having modded many tuners for Ed Hanlon and many customers of my own by virtue of owning two hi end audio shops in CT. Tantalums were frequently chosen by designers in the se

Mac, LOL ! very good ! I needed a good chuckle this morning. Cheers, HRW

Mike, YES ! Exactly. My comments are not meant to discourage enthusiasts from recapping, but rather to educate them. As a few others have pointed out, many of the electrolytic caps of the early and mi

Mike, Bob and I have been trading finds and observations for the test and measurement enthusiasts. I purchased one of these boards and sent along the enclosed paperwork to Bob. A copy for you is attac

Victor, Are the cap locations in question on the audio boards that you sent a picture of? As of late, I have been working with Ray Waters in the design and prototype measurement of tube amps and pream

Marc, At some point in time a few years ago, there were several sellers of various brands of Hi Fi snake oil and/or magic rocks that sold " break in devices " for a substantial chunk of green. Basical

Another comment re Tantalum caps.... One of my early mentors was an engineer at Norden Systems . He shared with me lots of info regarding component choices , the do’s and do nots. These guys built lot

Marc, Yes they do, and I had an interesting chat about tantalum caps with a Yamaha employee in the late seventies. The early natural sound series all had tants in the audio path. I was told that if th

I quite agree with Don. Dry beaded tantalums fail short. Period. About once every few years , one of the hundred or so PS rail decoupling caps aka 10uf 25v beaded tantalums in my 1985 Sound Tech 1500

Victor, It would seem that Q5 is open base - emitter , leaky collector - base. A NPN transistor will have it’s base lead at six tenths of a volt positive to its emitter. Conversely, a PNP transistor w

Victor, As you have stated that your T-100 came from Germany, I suspect your observation of " Bright " audio is due to the incorrect de-emphasis for use in the US ( if that is where you live ) I have

Victor, As is often the case with electronic equipment, multiple manufacturering runs are not always mentioned in the service manuals. As an example , Mcintosh would often issue two or three service m

To all, One would think , that over the years, the CE manufacturers would become aware that phenolic PCB boards substantially "crush" under the mounting screw pressure. A KT8300 that came my way recen