I've put all my Q8's to reel and made copies of them using a modified AKAI Quadraphonic reel-to-reel deck. Works good but I want to go further. I was able to pickup a Tascam BR-20 Stereo Reel-to-reel that runs at 3 3/34 ips. I plan on mounting a brand new quadraphonic 8 track head on a spare head stack I got off of eBay. Then I want to run the tape head output to a tape head preamp and bypass the stereo preamp inside the BR-20. Here's where it gets tricky. You can find plenty of Chinese tape preamps on eBay. The thing is if you look at the specs of the chips they use they all say cassette tape head preamp. I sure there is a difference in ohms on the head itself and then there is the tape EQ to consider. So does anyone know of a 100ohm (tape head) with 3 3/4 IPS NAB EQ preamp? Does anyone know how critical NAB EQ is to tape speeds less than 7.5 IPS? Some grey area here.
So my solution thus far is the use the preamp board from my Harmon Kardon 8+ quadraphonic 8 track player. I ordered the schematics for a Sony TC-248D quadraphonic 8 track player to see the specs, wiring and how to adjust the pots on the preamp. From what I understand in this forum it's the same as the Harmon 8+.
Any suggestions would be appreciated. I know some of you took a Fostex 8 track reel-to-reel and made it run at 3 3/4 IPS but I never read where they addressed the Tape NAB issue. 7.5 NAB EQ is different from 3 3/4 & 15 IPS.
So my solution thus far is the use the preamp board from my Harmon Kardon 8+ quadraphonic 8 track player. I ordered the schematics for a Sony TC-248D quadraphonic 8 track player to see the specs, wiring and how to adjust the pots on the preamp. From what I understand in this forum it's the same as the Harmon 8+.
Any suggestions would be appreciated. I know some of you took a Fostex 8 track reel-to-reel and made it run at 3 3/4 IPS but I never read where they addressed the Tape NAB issue. 7.5 NAB EQ is different from 3 3/4 & 15 IPS.