Despite their overly-robust power supplies, stock MR70 channels typically draw just a bit under 60 watts in Record - a bit less in PB (since the record circuitry B+ is switched only when actively recording). Fused at .75A/channel.
An entire 2-TK MR70 machine only draws about 3.5 amps from a...
Mike-
The machine next to the ATR is a 1/4" MR-70 modified by International Recording Co - it has Flux heads and four-speed capstan servo. The two machines on the right wall are a 1/2" 3-TK MR-70, also modified by IRC with full Flux head assembly, and a 1/2" 2-TK MR-70 rebuilt by Precision...
Martin Logans - Atma Sphere...and...more MR-70s. So yes - very familiar with their sonic characteristics. Anxious to hear what Mike reports back about his A.K. built machines.
Tom
As a fellow MR-70 owner, I'll be enthusiastically following this thread to read about your ultimate opinion on the Nuvistor-based electronics. Despite a fair number of excellent tape machines and PB electronics having passed through my shop/audio room - the MR-70s have pretty much set a high...
The key word here is “modern”, so Larry’s statement is basically correct. The ATR-10X machines were designed during a time when tape formulations had evolved to fairly high fluxivity levels and the erasure current followed accordingly. In the 1960’s Ampex engineers designed the MR-70 erase...
Studer A80 VU MKII 1/4” 2-Track, Overall good working and physical condition. Has both 1/4” 2-track and Flux Magnetics 1/4-TK head installed in place of the record head to play 7” consumer tapes. Switch on head block selects 1/4 or 1/2 track playback.
Heads were relapped by JRF in 2011, have...
Last year I had a new reel of 1/2" RTM SM911 leave some material on the guides of one of my machines, so I just use it as a shop tape.
OTOH I'm also sitting on a dozen new reels of ATR stock.....
Tom
Sam,
The tape in the top photo (the tape that's making a brown mess all over your nice machine)....what brand is that?
Or, from the text it sounds as if you're having problems with both brands mentioned?
Rgs,
Tom
Here's an Ampex 350 head assembly I had JRF Magnetics modify a few years back. It started as one of those play-only units where a dummy idler was factory-installed in position 1 and a PB head in position 3. John reversed the orientation, putting the PB head first, machined the center to accept a...
I like the comment about 'adding absolutely no additional flutter' for several reasons, some of them speculative. First, there are plenty of good original recordings where the scrape flutter is present, and we've come to accept that sound as being characteristic of that particular era. If we...
I can hear scrape flutter on some recordings, but someone had to teach me what to listen for. And, it took a few hours in front of several machines to do it (think Ampex 350 as starting point). What I haven't figured out is where in the chain the artifact is originally introduced or most...
I was thinking about the comment Mike made (and agree with) concerning the stability of the studio/master recorders, aka the big Studers, Ampex etc. It's been repeated often enough that you have to start by getting the tape to move straight across the heads first before trying to extract...