Hi all. I had a nice phone conversation with John French today (of JRF Magnetics). I asked him about aftermarket Flux heads for the ReVox B-77 HS, since the Technics RS-15xx Tape Project machines use them with great success. He told me he can supply both the record and playback heads, if desired. Cost is about $650-700 a piece. When I told him I was interested in replacing both the heads on my recorder, he actually talked me out of it. The reason given is because Studer record heads are wonderful in the first place, and I would be spending hard-earned money for minimal gain to replace it. He suggested, instead, that I relap my existing record head and purchase the Flux playback head alone. This will give me the maximum bang-for-buck, and allow me to keep more of my own money in my pocket. After some consideration on my part, I have to agree with the man. He's right. BTW, relapping of your old B-77 heads is $70 each, and includes a written printout on head condition. I think if you put this information here together with Arian Johnson's B-77 IEC EQ update posted earlier, you will be sitting pretty. Hope this helps. Craig