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Hi Joseph, That is certainly a large task you have taken on. I would start by selecting good known caps from Panasonic, Nichicon or Wurth. I have had one selection of TDK caps. When you look at the schematics, you want to determine is there audio passing through the caps or are they used for...

The switches on those decks which I have worked on almost my entire professional life do not fail all that often. Being I was a Teac Lead Technician in Chicago I only had to change one Microswitch in the 47 years I have worked on these and I can tell you it was no fun. I have a better idea of...

Seems like a lot of work to just avoid buying the right item in the first place. Neutrik makes all kinds of connector as well as Switchcraft but the Neutrik I have used all worked well and were more to my liking. They can be had from Full Compass Systems or my favorite place in the radio...

I have used Weller irons for the better part of 47 years and I have used wet sponge cleaning method for many years with the tips lasting more than a couple to few years- I stock a lot of them and different sizes but that item from China will not be supported for very long and they do not care...

If the jack will fit, the wire connection will offer a level of isolation as to the continuous plugging in of products. In my years of experience the PCB mounted jack was done to save labor but the way they soldered them was ridiculous and why I always seem to have to resolder these jack due to...

I have used Weller products for many years and I do not often lift foils from boards. One must understand the thermodynamics of the iron as in when to us the broader section of the tip in comparison to the fine tip end. Using good solder like Kester 44 always helps. With a Weller I have changed...

Personally I would make the voltage higher as the gain of the mic would be better. Maybe not 48Vdc but closer up. Pin 1 being ground would be to the box case no? 9V batteries would have a limited length of run as they are too small- try using the 3.7V lithium cells that could be combined to make...

As Dave said this is an over simplification of the requirements. I could see the need first to determine if the 48V supply has enough current capability as it might be limited to only supply small current needed for FET amps in mics. After that a suitable sub regulator system could be done using...

I have also often seen the need to have an adjustment for the different directions on the X1000R or X10R. Well I said one day a guy will figure this out and offer a upgrade kit. The problem is why does it always have to be me. Well I took a signal off the direction control and isolated through a...

Power supplies due to electrolytic caps decay over time. I have seen Otari MX5050 21V supplies at 17Vdc. The Tascam product was still made for profit and they may have used caps that with time do not have what is needed to get the job done. I have seen some units that the the filter caps on...

I have had unit that other Technicians worked on and there were NOT in good shape. The wind at the end of this little machine using AC reel motors also slowed with good tape on it. Some think they know how to adjust machines but the results they get and do not even check really tell the...

Adjustments in these units can not be done abstractly but must be done by the book. Slowing tape wind is a condition of sticky tape but also can be cause by adjustments by amateurs without the Tentelometer gauge.

Click track is a high volume level with nasty waveforms. There is a switch on the deck to apply it to track 8. You are doing things wrong so this is one of the problems. The return signal from the deck goes into an input module and this can be assigned to an of the 4 busses but you need to know...

I deal with bad SMD parts all the time on Tascam servo cards- they get replaced with through hole types as SMD parts were never meant for 30-60 year old equipment. They are cheap and are used on cards that are throw away. This is why I can still fix some Tascam cards except the 238S and getting...

There are some decks like the 688 that have electronics switchers in them that feed the signal directly not through the fader of that channel. These can be hard to understand for most people as even an Engineer and person who has worked with these for years can make mistakes. I worked with...

A lot of power supplies can be had at Marlin P Jones and associates or MPJA.com as when I worked at Moody as Chief Engineer a person would often come into my office and ask me where to get one of these meaning a wall wort or DC power supply as they fail all the time. I would examine the specs...

You could play the tape on a 234 that had pitch control but how would you know the speed was off unless you had perfect pitch. Many people's machines were not exactly on speed when they used them. These were not production devices but for trying out an idea and then using a real studio to do the...

Regardless of current political and biological threats, these tape deck repairs continue to come in at fast rates. I have used DA513 many many times in all kinds of decks and the only one they don't work in is the Technics that use the DA403 for the 5V supply. DA513 Lamps...

To answer the actual question NO I have never had a 788 in my shop. In fact a 688 just came in. However, you are talking about a part called a tactile switch that is used in decks from the V900X to the Porta Studios and just about anything else- even my garage door remote has a tact switch in...

Professionals do not cut belts off nor do they replace them in such abstract methods. I can tell you I have replaced hundreds of belt on the 30 series and at least 10 on the TSR8. The head base is removed to get the flywheel off the main deck so as to get the belt around this. A more important...