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In Reply to: RE: I never use frequency counter posted by ltman on May 13, 2024 at 16:25:13
I would have to add a balanced sound card, but that is not such big deal. Adds to the cost, though.
Follow Ups:
Will do. I will post my initial experience testing with the software within the next few days. Certainly there will be a learning curve for me since I have never before attempted such work with tape decks.
And I will go for a better spec'd sound card eventually, although the Z's circuitry likely far exceeds the specs of even a pro tape deck for distortion, frequency response, etc.
First testing after matching levels between deck and software.
I ran two dests, THD and Frequency response, using 7 1/2 ips, normal bias setting, Quantegy 456 tape.
THD hovered around .3% at 400hz which I believe is the only frequency the software can generate for THD test. I did not make a screen shot of that test.
The screen shot here shows frequency response sweep function plot, deck recording in forward direction, so this sums the distortion from recording through playback electronics of the deck. I do not have a calibrated tape yet so I cannot test playback seperately I guess.
Plot is about what I expected based on what I heard from listening to tapes on this unit (decent bass, rolled off highs) and prior to any recording/playback electronic work or head alighnment.
I will look at the SM and see how I can test the different recordng and playback electronics independantly to see where any problems might be. Certainly .3% distortion at 400hz would not be up to spec...
...did you get it plot two channels on the same screen?
I installed it but had problems with the sound card, doing it all in the background. The first card did not fit, even though it was supposed to. The second one had bad channel. This one is working but I only get one channel on the screen.
yes, the screen shot I posted of the plot shows two channels. I do recall in the help that if you are using a sound interface that has more than two channels in hardware there is some special configuration you may have to do of the interface.
"sums the frequency response error" would be more clear I guess than "distortion"
I ordered a PC and it should be here in a couple of days, then loading the program, and I am looking at this sound card:
I like it because it has balanced ins and outs, and the price is not bad either. Not sure about its compatibility yet.
By that time you will have gained plenty of experience, so be prepared to advise. :)
Looks like a great card for this work. The docs included with the T-100 software are quite good in my opinion.
Anyway for me the hard part is still to come: figuring out how to make adjustments and repairs to improve the performance of the Sonys so they are up to spec.
Would have been nice to still have a 909 for comparisons with the Sonys. I bet no contest...
And I am pretty sure no matter how fast I run, you will end up ahead :)
Looks like you've got your work cut out for you to get to this performance:
:)
This is a Stellavox sp7 that I used regularly, many years ago. It was custom modified by Georges Quellet and John Curl. Sure wish I could find it now!
*********
We are inclusive and diverse, but dissent will not be tolerated.
My 909 sounded so good I bet it would be close to the Stellavox. But I sold it :(
and there is a Stellavox on the bay right now for only $35K.
You should grab it :)
He was talking about the portable SP-7, not this stationary beast.
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