Reel to Reel Porn

I am impressed. Does the deck sound as good as it looks? I have heard good things about those decks but know little about them. Do you have all equalizations for the amp? Is it indeed an integrated amp or is it an pre amp for the r2r? where did you find the equalization circuits and how did you go about the amplification. Very interested and someday ill build my own doshi or what have you. Any advice or source would be appreciated. Cheers!
 
The Crown is an excellent sounding deck with a stable, accurate transport coupled with a well designed record and playback electronics section. I used a circuit given by Joe Dundovic who was head of engineering and one of the founders of Nortronics magnetic heads. Since I use it for playing 7.5ips tapes recorded in NAB equalization that is the only response. It does have high frequency adjustment capability for trimming when necessary. To provide some additional gain I built a second gain stage based on the Shure M64 preamp and power the complete circuitry with a battery for quiet backgrounds.
 
It’s good, and for what I paid, I stole this. The clean metal reels alone….
 
In a way similar to what Studer did for tension control in A62/B62. Studer used magnetic tape glued to supply drum and contactless head to read the signal for servo control .
Speaking of B62, here the one I restored recently, playing 15ips copy of EMI recording of Beethoven violin concerto by Oistrakh. IMG_3627.jpeg
 
In a way similar to what Studer did for tension control in A62/B62. Studer used magnetic tape glued to supply drum and contactless head to read the signal for servo control .
Speaking of B62, here the one I restored recently, playing 15ips copy of EMI recording of Beethoven violin concerto by Oistrakh. View attachment 74082
Beautiful deck, truly a classic. There have been direct drive turntables that have a magnetic strip around the inside of the platter. Then a magnetic head detects the frequency on the tape and adjusts the motor.
 
Thank you for the kind words. . The deck come to me in a very rough state with the multiple issues, but the headlock and the butterfly heads were almost new. The mechanics and electronics took. some time to get in order. Now it terms of signal/noise and bandwidth with the modern SM900 it way better original specs. Still, my second deck, RS1500 with FluxMagnetcs head and outboard tube playback sound to me a bit more involving. But Studer in the record mode just fantastic. I've made a few copies of my 15ips tapes with great results.
Here are the parts replaced in B62.
IMG_3775.jpeg
 
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It is an aftermarket device from Tentrol that monitor's the rotational speed of the supply motor and varies the voltage to the motor accordingly.

View attachment 74072
OK that makes sense. I didn't see any direct tape tension sensing arms (like on the Ampex MR-70 or (ugh) 400 series or of course Studers) and wondered how the tension was being sensed. In this case it is indirectly. That actually looks like a fun project to make, and using something like a PIC microcontroller could do it quite easily.
 
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