R2R: 2-Track to 4-Track conversion

[SaSi]

Please bear with me if it sounds silly, but:

Is it feasible to convert, say, a Revox B77 2 track machine to a 4 track machine by replacing the Rec/Play/Erase heads donated from a 4 track B77 deck?

I know the merrits of 2 track machines, so I could rephrase that to converting a 4 track machine into 2 tracks...

The question I have is: Are the heads the only difference between such versions?

 

[goldear]

It should be feasable. Your record EQ might need to be tweaked slightly to accomodate the new heads. But I'm not completely certain about that. :scratch2:

 

[SaSi]

I believe the heads themselves have some differences depending on deck speed. At least that is what a 4.75 stamp on the playback head of a slow B77 version implies.

I am guessing that the half track / quarter track differences have only to do with track width differences. Track width perhaps has relevance with BIAS signal strength and perhaps rec/play ampliphier gain. I base this guessing on the assumption that a narrow track / head combination, when reading, should have less gain and another assumption that a wider track might need more signal to "activate" more iron oxides forming the track.