IIRC, the test record you're using is known for poor channel separation. Just couldn't see how a conclusion could be drawn as to how much was in the record and how much was due to the cartridge. I've not measured a 33, of any flavor. Owned a PTG/II better than a decade ago.
@JP I did it using their method, one channel, flip lp and measure the same channel. Did it twice, consistent. Used +/- 1 octave around 1000 Hz. Even more confused...if possible. Lol Measure at pre out -15 dB ~ unity gain Phono amp out = pre-out, ~170 mV 1000 Hz
The CBS test lp method: Measure right channel with right freq. tones. Use the 1000 Hz value as 0 dB. Convert the other frequencies to dB using the 1000 Hz base. They have a conversion chart when RIAA equalization is used. spec = chart value delta = difference between spec & measured Flip lp over to left tones and repeat, but do not change the measured channel (right) when playing the left channel tones. Use those values to compute crosstalk. If the right channel measured 166 mV when playing the right 1000 Hz tone and the right channel measured 23 mV when playing the left 1000 Hz tone, cross talk: = 20 log 23/166 = -17.2 dB Do that for each frequency. They have >20 frequencies. I only did +/- 1 octave around 1000 Hz since the AT33EV spec is rated at 1000 Hz. At unity gain it was ~170 mV and 23 mV, same as the phono amp output. Same ~ -18 dB Output ~ 0.3 mV x 40/(10 + 50) x 9 (SUT) x 80 (MM section) ~ 170 mV Either I'm missing something, the test lp is not good enough or the cartridge is bad?
BJC are nice cables for the 1200g but the connecting plug is big like a pen**. This is once instance where smaller might be better.
Thank you! CBS ~ -20.4 dB Ortofon ~ - 34.6 dB so if I'm at ~ -18 to -19 dB it appears I'm getting everything out of it? How did you measure those? Is it safe to say -18 on the CBS is ~ 32 dB the Ortofon?
Virtins Multi Instrument. If your cartridge crosstalk exceeds what the STR-100 can measure you've no way of knowing by how much. Ya
@patient_ot is the Ortofon the best current available for crosstalk? It's not been a measurement that's interested me so I've not validated any records.
Yep hypothetical If you measured a cartridge using the CBS and got -19 what would you expect using the Ortofon? Or is there no way of estimating/extrapolating? I guess you are saying the -18 might be real and be -18 on the Ortofon, no way to know until measured.
No way to know. Something close to the ceiling of -20 (my measurements) is likely real, but beyond that no way to extrapolate.
Is this the one you used? https://www.amazon.com/Ortofon-Test...ocphy=9006006&hvtargid=pla-356708300358&psc=1
Yes. I can't vouch for he other tracks on it. I know the sweep tracks are rather inaccurate. My want to wait for @patient_ot to chime in as I believe he may know which records are best for crosstalk. I've measured up to -38dB on my copy which will exceed most cartridge specs.
It is the best that I know of. I got the tip from Thomas A. I think he tried several test LPs that were currently in print. Obviously you have to make sure the record is flat and not warped or off-center. I only use the Ortofon LP for crosstalk and the tracking tests. It's not really good for anything else. I use the Ortofon LP with Audacity. I know some folks have used it with a Fogzometer or O-scope. I don't use the multimeter method for crosstalk as it's too much of a PITA. NOTE: FWIW all of the AT carts I tested (no MC though) were in-spec or exceeded spec with the Ortofon crosstalk tests. Obviously there could be some sample to sample variation and even things like temperature when you do the test do have an effect. @needlestein has tested a plethora of carts using crosstalk tests and could probably tell you more about how to optimize this sort of test or see whether a cart is meeting spec or not.