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Messages - thomasdf

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Tape Tech / Re: A77 standard & pro - tech questions
« on: March 02, 2014, 05:43:03 PM »
Thanks! These are precious pieces of advice!!

I started a thread on the Gearslutz forum in which you may be interested :



Well I bought it tonight, before I see your post.
Still, Studer & Revox parts are easy to source here in Europe, whereas with Otari it's a real pain to get spare... I even have 2 dead A77 at home in which I can take some parts.

On the A77 Pro I just bought, the reel motors are fine and fonctionnal, the sound is going in and out. I fixed the PSU problem in 5min, but now I get to the main problem :

When I switch the power on, the capstan motor starts and then slowly stops... When I re-launch it with hands it turns and then slowly stops.

I think this has to do with the speed regulator, I'll check the PCB Card one of these days as it is getting pretty late now here in France.



Tape Tech / Re: A77 standard & pro - tech questions
« on: February 23, 2014, 05:07:13 AM »
Well there were SLS A77 as for Super Low Speed, very very low speed allowing up to 24hours of recording and stuff..

But the A77 Pro is another animal : XLR Input and Output, 7,5 & 15 IPS speed, it was clearly aiming at the professional recording studio market. You can only record from a line input or the tape itself...

Many people swear by it as being a great deck with a really good sound to it... That is why I am very tempted, being a sound engineer trying to add some warmth to my work ;)

The bummer is that it's really hard to find informations about this model...

Good informations about a few different models here (including the professional)

I am still wondering if the Pro & Regular share the same PSU and Reel Motors

Tape Tech / Re: A77 standard & pro - tech questions
« on: February 22, 2014, 02:49:36 PM »
Thanks for your answer. I was asking because I just CANNOT find the A77 Pro service manual online. I have the regular service manual but there is no mention of the pro version in it.
Studer's FTP doesn't have it too... I don't even know if it exists :)

I have a found a A77 pro for 90? and I am not sure if I should buy it... It doesnt turn on (I guess that's no big deal if the PSU are the same on all A77) and the right reel motor is hard to turn (this is not brake related). The guy also gives me with it a dead A77 mk1 with lots of missing parts on it but (one reel motor, repro head, pinch roller) but I guess I could salvage one reel motor from it, and maybe the PSU if it is more than just a dead fuse.

Does it look like a good deal to you guys? I am very tempted because the A77 pro seems to be pretty rare, and I'd love to use it. (by the way, is it normal that there's no gain pot on the front plate for the pro A77? How does one set up the input gain?)



Tape Tech / A77 standard & pro - tech questions
« on: February 22, 2014, 06:16:37 AM »

I may get a non working A77 pro on Monday. I know for fact that one of the reel motor is dead, but I have a few other A77 that are non working, so here is my question :

Is the reel motor on the Pro version the same that the MK1 or 3 A77?

Is the power supply the same too?

Thanks in advance,


Tape Tech / Re: Just got a A77 MKIII - mods & tweaks
« on: February 16, 2014, 02:23:20 AM »
Ok, I'll see if I buy it and then I'll figure this out. The service manual is really well done so I'll try to find a way to fix it.

Tape Tech / Re: Just got a A77 MKIII - mods & tweaks
« on: February 14, 2014, 10:22:10 AM »

Thanks for your answer. I am in the process of getting another A77 (mk1 this time) as well as parts of a A77 (unknown version for the moment), so I guess I'll have some spare parts haha.
The head are like new to my eyes, they show very little wear. I have not demag them yet but I'll do that ASAP.

I can also take care of the recapping and I have already found an elegant solution to bypass the preamp and get the signal directly to the record amp thru pad resistors so I can run hot signal to the tape (master mix after a summing box or mixing desk), only by looking at the schematics...

I am amazed by the design of these tape recorder... Cristal clear, and really really solid. I need to get my soldering iron out now and do some testing.

I will keep you posted if you are interested in this project

I also have the opportunity to get for really cheap a non working A77 pro... Are the parts compatible between these? I know the tape speed, record and playback amps are different, but what about the brakes, VU circuits, heads, oscillators?

Tape Tech / Just got a A77 MKIII - mods & tweaks
« on: February 12, 2014, 02:57:22 PM »
Hello everyone!

I just bought a Revox A77 MKIII 2 tracks for really cheap a few days ago (60euros). It was in working condition, but I gave it a good clean from the inside to the knobs.
Looks good and plays pretty good too, even tho I am thinking of recapping it pretty soon (L & R channel are not perfectly matched).
I have a few questions for you connoiseurs :)

Is there a simple way to make it run at 15 IPS? Right now it is  3 3/4 & 7,5. I know there's a trick with the 60hz power, but I am in Europe... so 50hz here...
If there's no simple way, I am fine with 7,5 IPS for the moment.

Does anyone have more informations about bypassing the line/mic input to improve the overall sound of the unit?

What tape would you recommand? From what I read, it appears that LPR35 is a good bang for the buck.

I am planning on using it right after my summing box, before going back to Protools thru the repro head, and from what's I've heard right now it's working pretty well in that setup.

Thanks a lot in advance



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