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You can not use a Porta 2 manual for a Porta One as they are different. They were probably built in different years. Hi Fi Engine will pick up on your contribution and have it there. Not all their manuals are all that great but for the start of a repair maybe OK for that. Most people can not...

A lot of solder joints in decks are substandard and with some aggravation can break which is why I use sometimes 40-50 feet of .031 Kester 44 to correct a lot of this. A broken foil on the board is not a usual thing and often caused by mechanical stress given to the board by someone twisting and...

On the 58, there are DC reel motors that have brushes and a commutator. This with a lot of use fills with carbon causing a shunt across the fields of the motor. The solution is to take the motor out and apart and clean the carbon out of the commutator gaps. After that then regular motor torque...

There are a lot of steps in the setting of tensions. There are opto and springs and all that is associated with the mechanical operation. Those that get into these machines and read stuff on the internet about a problem are maybe only seeing one part of the system. A person can not get these to...

Maybe there are jumper missing on the accessory part of those two buses.

There are some guys that are progressing to the stage that they can take in equipment and have done repairs already. Jeff in SC and Gerhard in FL with Dan in northern IL. I got other guys like Dean in Canada but I don't hear from him often. Apparently he is working on cassette decks, amps and...

As some forums like TH and AK alienate their better Technicians and I leave, these places lose most of their good advice and then it leaves those members lacking. Well I mentioned this to one of my past Engineer clients and he created a FB page that we can better manage what is done there- the...

I have had supposed smart phone a long time and they never show me that they are smart but should be called what they really are is dumb ass chinese junk. The one I have now is changing modes while I talk to another technician and drops calls. I do not call this smart at all. Maybe they should...

So what did you find? Usually the play function is checked and if that is good then the mixer levels and then record levels. If the input levels seem correct then it could be record levels. Maybe someone adjusted the deck for some of the NAC chrome tape that had a 5-6 dB lower output. I had one...

Low end is one reason a 15 IPS deck is better than a 30 IPS. Unless you are recording pipe organs that can go below 50 Hz then there is not that much down that low. Some low end can be enhanced by larger coupling caps in the audio path. There is a reason that they made it this way and if it was...

Yes alignment tapes are expensive and kind of rare these days. Use them carefully. The MTT150 is a very often used tape the MTT114 is good for azimuth. Teac made a lot of tapes for different reasons like the MTT902 is a mirror tape to check the tape path. Porta Studios were generally made for...

I can start to train you by E mail but the better training comes when one on one. Trouble shooting is a method of going through a circuit and knowing what should be there and what is not. This is best done when you have a left channel out while the right is still working and you can compare one...

Hi Al, Well you really can not get into too much trouble with scopes and meters but the device you are working on should not be shorted with metal probes. The input impedance of the meter and probe is high and they are design for minimal insertion upset to a circuit. I went to college for about...

Most likely the play gain or record setting is all goofed up. A broken solder joint in a op amp feedback circuit can cause the gain to go up to 20,000 when it might have been designed for 100. Portable devices are made for profit and all of the Japanese wave solder manufactuing is sub grade...

There may be a new FB page for tape deck people to visit as well as here- It might be good to check it out as well. Sometimes you need all the help you can get. https://www.facebook.com/groups/819609535336117/posts/819620412001696 Yes I am there too.

Well was it ever fixed? Was the remote dummy plug in? That is the most common reason that the deck does not work.

It is never a good idea to take an erase head out of a unit that you expect to work normally. The erase head present a load to the oscillator and when that is removed the bias will be all over the place- probably too high and the unit will be useless for recording from that point on or erasing...

Walmart will never have the three terminal connector that this has on it. This was a custom made supply and as long as you have the plug in connector the power supply can be made to give out 7.2 Vdc at 800mA or 1 Amp if needed. A LM7805 regulator can be used in a circuit to get 7.2 Vdc out and...

This is the problem with computer related and digital devices- they may work well when set up but they can be a bear to set up initially as you need a lot of help with hardware interfacing and computer audio settings. One thing that sticks out is the setting to S/PDIF where the US-144 is a USB...

Well if you are happy then there is no arguing with that. I have no experience with E bay suppliers except that when clients bring me a unit in and it has the wrong belt in it I ask where did this come from and the answer is E bay or some belt kit that was not only wrong but terribly over...