Joachim, Herr Manger is technically correct, but musically generated DISTORTION is still music. IM generator generated distortion is NOT MUSIC. There was an AES paper written in the early 1960's by an AMPEX employee that says it all.
Piano tuning keys. I have chimes made from hanging a dozen in two rows, all resonate at ~ 8kHz, and you can't record and play it back accurately with anything (including digital).
Have you tried reproducing it live to see if the problem is before the recorder?
The SMPTE IM number quoted in the Ampex article is about 10%. I have independently verified this.
This AES paper is: 'Intermodulation Distortion in Tape Recording' Robert Z. Langevin
JAES July 1963 Vol. 11 #3
This AES paper is: 'Intermodulation Distortion in Tape Recording' Robert Z. Langevin
JAES July 1963 Vol. 11 #3
Quote from AES paper: "In case of recording sound effects where no harmony exists, IM will completely ruin a high-level recording. The recording of jangling keys is a case in point."
Interresting paper...http://www.linearaudio.nl/Miscellaneous/langevin%20im%20in%20tape%20recorders.pdf
I do alot of listening from tape.
//Anders
I do alot of listening from tape.
//Anders
It is an INTERESTING paper isn't it? It is the sort of paper that the JAES was originally made to do. Today, it would probably not be considered, yet it teaches and has lots of measured examples. What a concept! '-)
Anadigit
I hope you will share some photos of the brains hidden in those 2 vaults once you get it!
Because inquiring minds want to know...
Regards
David
I hope you will share some photos of the brains hidden in those 2 vaults once you get it!
Because inquiring minds want to know...
Regards
David
Aftet I take off the secret cover I saw something made me surprise !
It's better than Vendetta Research but what I need is...
John Curl is my techer for a long time but...
Take a look into its internal part. No need any complain about layout and section amp.
If any Diyers need to know its schematic please ask to Parasound directly, I can't share amy patent to public.
If any Diyers need to know its schematic please ask to Parasound directly, I can't share amy patent to public.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Theres been at least 3 different caps for that AC filter from the CES visits over the years.
I built my Pearl 2 with similiar style but as Reinhard says A pic of the internal box would be nice.
I built my Pearl 2 with similiar style but as Reinhard says A pic of the internal box would be nice.
The JC-3 is my first attempt to make an all IC phono preamp. I was specifically asked by Parasound to avoid using discrete jfets in this design, as they became VERY hard to purchase at the time of development of this design.
IF you want my VERY BEST, then you have to find a used Vendetta Research preamp, an Audible Illusions tube preamp with a GOLD Board in front (my design) or the new Constellation phono stage, ($19,000, to put things in perspective)
There is NO FREE LUNCH, although you might learn something from this design, just by looking at the pictures already posted. Note, EXTENSIVE RFI control, and quality power supplies, with an Rcore power transformer. Everything counts, including an ALUMINUM not steel chassis.
The internal circuitry might be 'disappointing' to many here, expecting more sophistication from me, as I put into the three previous examples. The IC's and the circuitry was developed to complement each other for their relative strengths and weaknesses. They work better in this configuration than they might, working alone as a phono stage, but this is the best that I know what to do with IC's only. Another, more elaborate design, like Bob Cordell's latest effort, might be better, I cannot say.
Note that 1 IC section is a servo so that the phono preamp has no coupling caps throughout. The large caps are Polystyrene Rel caps, like Vendetta, Constellation and Ayre use, for the same purposes. This is an important, and a relatively expensive addition to the design. Lots of luck, copying it. It should be relatively easy.
IF you want my VERY BEST, then you have to find a used Vendetta Research preamp, an Audible Illusions tube preamp with a GOLD Board in front (my design) or the new Constellation phono stage, ($19,000, to put things in perspective)
There is NO FREE LUNCH, although you might learn something from this design, just by looking at the pictures already posted. Note, EXTENSIVE RFI control, and quality power supplies, with an Rcore power transformer. Everything counts, including an ALUMINUM not steel chassis.
The internal circuitry might be 'disappointing' to many here, expecting more sophistication from me, as I put into the three previous examples. The IC's and the circuitry was developed to complement each other for their relative strengths and weaknesses. They work better in this configuration than they might, working alone as a phono stage, but this is the best that I know what to do with IC's only. Another, more elaborate design, like Bob Cordell's latest effort, might be better, I cannot say.
Note that 1 IC section is a servo so that the phono preamp has no coupling caps throughout. The large caps are Polystyrene Rel caps, like Vendetta, Constellation and Ayre use, for the same purposes. This is an important, and a relatively expensive addition to the design. Lots of luck, copying it. It should be relatively easy.
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