Recent content by Muckelroy

Sweetbeats, Are you sure the "~" button sends tone generator to the channel? Does that button not swap the phase of the signal? I seem to remember on an Otari console, that exact same symbol was on a button used to swap the signal phase.

Thanks. Yes I saw that too. It's not burned. It's a 0.045 ohm 3 watt resistor. It is likely metal oxide construction, and is painted black. I lifted one leg and that resistor tests fine. The transistor it is attached to also tested fine. I reattached the P901 ribbon cable (the one that goes to...

It's been a very long time since I made a new thread here. This isn't so much about analog recording gear, but about a piece of instrumentation you may need to use to service analog recording gear. I obtained a Tektronix R7603 oscilloscope recently. It has a NASA asset tag on it, so I am not...

You are right that this era of Teac is quite easy to work on. I don't know what your definition of "pro" is. Plenty of machines of that era were all solid-state discreet, mostly due to the non-existence, or high expense of integrated circuits during that time. Just because a circuit is made...

Memories. Capacitor dynamite It was kind of a piece. I traded it for a pair of Marantz speakers. At that time, I was not as skilled in audio circuit repair as I am now, so I didn't do much. I am sure it would have sounded much better with a full recap and cleanup, had I been older and wiser.

Slightly off-topic, but thought this build / kit was neat. I worked on a Pultec MEQ-5 once (the tube model.) It was one of the highest quality builds of point-to-point tube gear I've seen. I rarely go out of my way to buy carbon comp resistors, but for this one, I did, just so it would look...

I considered taking it to my brother for the work, but I ended up relying on a different luthier - Danny Shoemaker at Straight Frets. One reason being, I was working on Danny's Hammond M3, so we ended up trading work for each other. I may still take it to my brother to finish out some wood...

My only experience with these machines was a later Sony-era JH-110. It did not have red sockets but had its fair share of problems. Hitting play would spool out the tape. One of the capacitors on the torque board had failed, and was leaking too much voltage to one of the ICs, frying the IC...

Y'all will be happy to know that I finally (3 years later) have this in the hands of an accomplished luthier here in town. He built a saddle, installed it and re-strung it. It plays beautifully. He will now complete the body glue work, and some fret work. No truss rod in this thing, so it will...

You said Mark I, but did not specify if this is a stage piano or a suitcase piano. The stage piano does not have a preamp and is instrument level, so requires an instrument level preamp. The suitcase piano has a preamp, but most of this age are in serious need of servicing/overhaul. None can be...

Whoah. Yeah, the perf board is a dead giveaway to the "home brew" argument.

"bug-a-boo". That's a pretty Rated G term for what I would call this issue if I had to troubleshoot it! :eek: Happy to hear the progress was made!

So you... wait you fried the +- 35V rail, replaced the fuse, fixed the problem, then reproduced the problem again? And fixed it by directly soldering the aforementioned internal connector?

I know first-hand how frustrating it can be when power transformers are failing or doing wacky things. I've seen power transformers put out too much voltage in a Leslie 122 amplifier, and in a Peavey VMP-2. It was weird, because other people say PTs fail in such a way that there is less voltage...

Well, ask yourself how much you're willing to spend on this machine, then weigh that with finding an Otari authorized technician, or someone who regularly services these. As for going about it alone, if you were willing to go so far as to replace the Control P.C.B. PB-46Q, why not replace the...