NEW Speed Calibration Test Tape For Cassette Players: Decks, Boomboxes, Walkmen

Description

Accurately made test tape: 3000 Hz signal test tape recorded on a brand new Sony HF blank tape from a 3000Hz digital signal source and checked with Sony Professional test tape WS-48B, so you are buying an accurate and stable test tape that has almost the stability of the sony professional test tape which was a 60+ dollar test tape when I bought it from Sony Service Center back in the day.
First photo shows the tape you will receive. The second and third photos are for illustration purposes only and those tapes not included in this sale.
As said above, the second and third photos are for illustration purposes only and show the sealed blank tape that was used for the recording and the Sony Professional test tape that was used to check the accuracy of the recorded tape after it was recorded. Every recorded tape is checked that deviation is no more than 4-5 hertz against the professional tape. I can't just trust a basic Sony HF cassette that it is good automatically after recording, for one thing the plastic shell could have become warped with age and giving some uneven friction, so I want to make sure that every single tape has been checked for accuracy and stability before mailing it.
I remember few years back when I bought a test tape on ebay from a seller, it had a 20-30 Hz deviation when compared with the Sony WS-48B test tape, not to mention the stability was pretty bad too, so now you have a chance to buy yourself a properly made, accurate and stable test tape. I chose this type of Sony HF blank tape to do the recording on because it rotates very lightly which is what was needed for the purpose of stability. As you can imagine, would Sony charge for a test tape if it was easy to make one by just recording a signal on any blank audio cassette? This version of Sony HF blanks were giving me a result that was very similar to the Sony WS-48B, I was surprised (at least when they are new, I don't know what happens if you use them a lot, but if you just use them occasionally as I do, they stay accurate and stable).