Tascam 42's reproduce amp has FET direct coupled at the first stage. The usage of coupling caps is minimal.
On the other hand, if my memory were correct, BR20 is mostly OPs. Yep, I like 42 much better.
Actually this guy in Japan also came to the same conclusion:
http://blogs.yahoo.co.jp/nekoneko_onsen/folder/117594.html?m=lc&p=242 and 52 are probably Tascam's best small 2 track machines, IMHO. Beautiful Woelke heads, good circuit design, solid transport.
I will take them over Otari MX5050 anytime.
No idea about MX-55 though I do have two MX-5050II and one MTR-15. 55 and 5050 are very similar designs?
MX-5050II needs a lot of work to make it sound great, BTW.
I have been doing a lot of mods just for fun. First of all, definitely you do not want to run the wires too long.
Tube amp has its appeal yet I can take transistors just fine. I prefer to have all of the basic things done right.
Most reel decks have awful power supply, for instance. You can bypass this problem with an outboard head amp,
but you will be running into other problems, and still, the basic problem is still there.
Studer A820 and A810 are typical examples. Both machines have the same amps, same heads yet A820 just sounds better.
Why? Not because A820 has a fancy transport, it's because A820 has a slightly better power supply.
Only for playback, the ideal tape project machine for me will be B77/PR99. Beautiful beautiful mechanic parts,
great sounding heads. It has so much space inside, you can put in a super power regulator, redo the head amp,
add in big power caps, swap wires, recap everything, then you will have a killer machine.
Very easy to work on, spare parts are readily available. You never have to worry about screwing up.