bredgeo - 2009-01-07 10:16
Hey, Yeah!
Any one knows a brand name or a web sight that might have those on sell for pros or private parties (like us)..... a cassette speed adjuster...???
It is time I adjust ALL the Bboxes's tape speed to the same speed.... Some are a little faster than others or visa versa!!!!!!!!!
Thanks!!!!!!!!
I once saw a divice from Kenwood. This was a wow & flutter meter.
For the speed..... there are special cassetes (3150Hz) and then you have to connect an oscilloscope to the boombox.
Described in the service manual from the GF 9595 i sent you.
I use a very Scientific method.....
I just listen by ear,then have my wife listen to it too.
If she says it's good then the tapes speed has to be dead on.
Better than the factory......
And when it's louder than the wife it's a 100% perfect
quote:
Originally posted by Eddy:
And when it's louder than the wife it's a 100% perfect
Totally correct Eddy!!
Hey Eddy, hey Skippy.....
The cassette needing a an oscilloscope would not be my first choice!
The wife thing has been done many times.... I even have a Pro recorded cassette that I play (which I know the songs well) and adjust from that.... but even those adjustments are not 100%.... especially when the wife keeps on asking, "Are we done yet??? Are we done yet???!!!
Now, I know that such a Mechanical tape exists for I do believe I remember Frank, our once top ST2G repair guy from Cali, showing the M90 being worked on, and he had a pic posted showing that he was adjusting the speed with this device!
I WANT ONE!!!!!
Yes I agree I would love to have a proper adjustment technique ,besides my wife's ear.
ghettoboom777 - 2009-01-07 13:15
Hi everyone-My GF-9191X is a little slow-how do I adjust,is there a way or do I need to replace the motor?
The belts are all o.k. and I don't have an output issue(power supply) like my 9595 but the right channel is weaker on stereo but fine on mono.
This stereo is prasctically mint.
I'd really like to get the cassette to play at the right speed.
Any help on this would be greatly appreciated.
I'm having photos developed of the 9595 inards.
Thanks guys-GB.
I remember seeing these too, they worked similarly to those bumps on a the edges of a turntable platter so you could adjust by-eye.
Surely this is something that could be made? Using a clear cassette and some paper with the right timing information on it? I'm sure the genuine ones would be prohibitively expensive.
Just an idea anyway.
Rock On.
quote:
Originally posted by ghettoboom777:
Hi everyone-My GF-9191X is a little slow-how do I adjust,is there a way or do I need to replace the motor?
The belts are all o.k. and I don't have an output issue(power supply) like my 9595 but the right channel is weaker on stereo but fine on mono.
This stereo is prasctically mint.
I'd really like to get the cassette to play at the right speed.
Any help on this would be greatly appreciated.
I'm having photos developed of the 9595 inards.
Thanks guys-GB.
usually there is a small hole in the back of the motor to stick a small jewelers screwdriver in and adjust the speed control pot inside.If not Just follow the wires from the motor to the pc board and look for the adjustment pot near the wires.
ghettoboom777 - 2009-01-07 19:26
quote:
Originally posted by skippy1969:
quote:
Originally posted by ghettoboom777:
Hi everyone-My GF-9191X is a little slow-how do I adjust,is there a way or do I need to replace the motor?
The belts are all o.k. and I don't have an output issue(power supply) like my 9595 but the right channel is weaker on stereo but fine on mono.
This stereo is prasctically mint.
I'd really like to get the cassette to play at the right speed.
Any help on this would be greatly appreciated.
I'm having photos developed of the 9595 inards.
Thanks guys-GB.
usually there is a small hole in the back of the motor to stick a small jewelers screwdriver in and adjust the speed control pot inside.If not Just follow the wires from the motor to the pc board and look for the adjustment pot near the wires.
Hi Skippy1969-Thanks for that-I'll be doing that this weekend for sure on my GF-9191X-The sound doesn't distort or slow down on this cassette player so I'll bet this will work.I don't have a Power supply problem with this one.
Thanks again-GB.
Cool,good luck with it.
i will record a 1khz @ 1Vp.p sinewave from a good tape deck/new i.e Tascam and use it to adjust my target deck. i do not use scope but use a Fluke 179 to measure the frequency.
And NO, i will not ask my wife to hear it. Else she will say not another junk!
Hey guys, try this: "Tape Speed Checker" from
Proko maybe this will help with your problems about tape speed.
I already got a "capacitor checker" (just check the capacitors are is good or bad without disconnecting from the board) from this producer and I solved my problem.
Contact the seller and I hope that you will help you.
Little help with serbian language for the contact
:
Ime i prezime:/Name and surname
Broj telefona:/Telefon number
e-mail:/e-mail
Message:/mesagequote:
Originally posted by bredgeo:
especially when the wife keeps on asking, "Are we done yet??? Are we done yet???!!!
Is this still about servicing a boombox ?
quote:
Hey guys, try this: Proko maybe this will help with your problems about tape speed.
I already got a "capacitor checker" (just check the capacitors are is good or bad without disconnecting from the board) from this producer and I solved my problem.
Contact the seller and I hope that you will help you.
Hey... Thanks! I am going to try him and see what goes!
You can use an universal counter conected to the headphone jack to measure the freq of the signal that's being played.
You can record on a "perfect" tape deck from a CD and then play the tape the BBX and the CD in a CD player.
Start both in sync and change the speed adjust until the sync is achieved across a long time.
I used this method to adjust the speed of one recorder using another as the "reference"
I played the same record at the same time in both recorders (the tapes has been dubbed with a mechanical double deck with ONE MOTOR ... so speed variations between master and copy are near impossible).
As one delayed, I adjust a little an restart booth in sync. Process ended when sync has been achieved for a long time.
Almost important is to run the deck for some time (let one hour) before adjust.
Some motor tend to raise speed a little because the selfheating .. as long as the motor used in BBXs (electronic) hasn't any real feeback.
Pedro
quote:
You can use an universal counter conected to the headphone jack to measure the freq of the signal that's being played.
You can record on a "perfect" tape deck from a CD and then play the tape the BBX and the CD in a CD player.
Start both in sync and change the speed adjust until the sync is achieved across a long time.
I used this method to adjust the speed of one recorder using another as the "reference"
I played the same record at the same time in both recorders (the tapes has been dubbed with a mechanical double deck with ONE MOTOR ... so speed variations between master and copy are near impossible).
As one delayed, I adjust a little an restart booth in sync. Process ended when sync has been achieved for a long time.
Almost important is to run the deck for some time (let one hour) before adjust.
Some motor tend to raise speed a little because the selfheating .. as long as the motor used in BBXs (electronic) hasn't any real feeback.
Pedro
SUCCESS.... That sounds like Success!!!!!!!!!!!
Will HAVE TO TRY (one day
) !!!!!!
transwave5000 - 2009-01-09 13:28
You need a calibrated test tape and test equipment
to do a proper speed adjust.
There is no nuts-n-bolts method for this.
tht would be 100% positive to have the equipment if you dont then its hear fashion
Of course an universal counter well gated with the audio output from a 3Khz tone is the "professional aproach".
I don't have laboratory at home. Altough I have this instruments at work, I can't bring any eq there ... you see my boss arrrrggggggggg
So, alternative methods need to be found.
I guess that the sync. method is enough accurate ... if you have a good quality cassette deck to record the tape.
Figure that most BBX are build around motors without feedback. So even after a good calibration .. this won't remain perfect for long.
Only real feedback or quartz drive can assure that the adjusted speed will remain stable.
And I've only seen one Sony with some sort of feedback in the motor (a sine wave whose freq. is realted to the RPM).
Then you have the mechanical speed control, in early motors, which have better behavior under voltage and load variations .. since they are RPM feedbacked.
quote:
Originally posted by transwave5000:
You need a calibrated test tape and test equipment
to do a proper speed adjust.
There is no nuts-n-bolts method for this.
Never thought of 3khz
What is the thing that they use 3Khz, care anyone to enlighten me.
