There are many possibilities of implementing this, including a digital control loop with microcontroller. With this approach there are some...
You can go directly with 2000 grit yes, but if you're not getting the right result you may need to use 800-1000 grit first. Keep in mind unless...
There is also a Chinese board available, but you need to remove quite a few components from the board to install it. It's available here, you...
W&F is indeed high on REV side (especially flutter). FWD seems ok. Would check the RMS value (DIN in WFGUI). It is possible to sand the capstan...
You can also swap the rollers between FWD and REV in order to see if this is the problem. What W&F figures are you obtaining ? JX505...
The speed difference isn't caused by polished capstans unless the wear is extreme and tape is actually slipping, but in that case you will also...
Try to clean the record level potentiometer with contact cleaner (Kontakt 60) and turn it from min to max 20 times or so. However do keep in mind...
Those measurements on the LINE OUT (while playing back the recorded signals) are done with unit sitting normal or upside down ? How do they vary...
Means the audio part is fine, problem is either related to bias or the tape path somehow changes when upside down. Next thing to measure is the...
The levels at the output right before the bias trap (pin 16) are almost equal. The 11mV difference represents ~0.18dB, which is insignificant. A...
Those voltages are AC or DC ? We are only interested in the signal inputs and outputs (pins 11, 7, 14 and 16, in this order), can ignore the rest....
The levels I would check at the output of CX174 also, the line out measurements can be unreliable. There is a thread on tapeheads that says what...
Yes, for the most part the 10kHz azimuth and 400Hz Dolby level are enough, given you already have the 3kHz speed/W&F one. For the Dolby level,...
Doesn't seem this unit has a line in, so feeding a test sinewave would be more tricky: you have to either use an attenuator or an FM modulator to...
Head does have some wear, although I don't think the head is the problem given it works fine upside down. A head problem would manifest...
That's very interesting working upside down and its the clue that needs to be investigated. Wonder if it's something mechanical or the tape path...
In theory you could use the 3kHz, but this tape has 2 problems: frequency is a bit low and also it's not a full-track. In practice it's probably...
Simplest way to replace the roller is to just push the pins put without removing the carriage. However wouldn't recommend that. Otherwise you do...
Trimpot shouldn't need to be maxed out to obtain recorded levels at least close to the source. The important thing to determine is if this...
Normally the solder shouldn't need to run through to the other side to make a connection, assuming the hole is copper plated. In your case it's...
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