ReVox A77 Mk IV High Speed, spring 1975 (interior)

This video is to show how is the internal life of a nice Revox A77 MK IV High Speed (19/38 cms.) of middle 1975. This machine was one of the first I personally restored with the integral substitution of all elkos, bridges and critical capacitors, and was than checked and tuned together with my great friend and "teacher" Vincenzo di Benedetto, the greatest Revox guru, also called "der Revox Papst", the pope of Revox.
For further information and vintage audio machines please visit my website www.revoxmania.com

[@davidbartley989]

I would never place my A77s face down on the front plate, even on a foam cushion. The beast is heavy and it is easy to loose your grip. If it falls, the tension arm and the S1-S4 switch shafts can bend. The machine is too heavy to rest on its face. I learned that the hard way. The only safe way to do this is to build a frame which raises the machine high enough so that the knobs, spindles and tension arm do not rest on the work surface. Otherwise, a great video. Thanks for posting.

[@lucamariaolgiati3297]

The foam cushions are made exactly for this. In ReVox Service we used to do this each day. Necer had the slightest problem, of course with the foam.

[@DaveMichalakChannel]

I rebuilt my A77-III `73 about 20 years ago. I replaced and matched metal film resistors, removed all tantalums and replaced them with bipolar electrolytics paralled with polystyrenes. Quiet, linear, and 20 db better common mode rejection. What a great semi-pro deck! 3/1/2014 DGM

[@ulissegarnerone]

PB SWISS TOOL SCREWDRIVER!!! the best of the best for me (piano tuner and repairer and audio-lover). Bravo. You don' t ruin screws, abc of well-working. Cheers

[@ruudvansteenis]

Still enjoying my two A77-HS recorders from 1975 and 1976. More than 40 years later, they still work as new! (I replaced capacitors and trimpots in the past and realigned the machines.)

[@Frank55]

I have two Revox A77 HS recorders from 1975. I have replaced all capacitors and trimpots. Also calibrated and biased the machines correctly. They are like new and still sound excellent!

[@harveysvintageaudio]

Excellent !

[@lucamariaolgiati3297]

Bravo

[@lesaventuresdejolemagneto4461]

Hello ! Very nice ! good morning from France ! i'm the M219 Brandt ....!

[@3125234302]

HELLO MACRON VIVA LA FRANCE

[@dubdoodle7191]

The earlier versions with the fixed left tape guide were a pain in the ass when trying to calibrate resistance.

[@ScottFrye000111222]

I have 2 model A77's here in the shop. One question : At 3:30 in the video I can see the tape moving along those two chrome guide wheels. Are those free-spinning or , is the tape just brushing the surface? Thanks

[@pony053]

Oh, please bring back quality made things....next to a Scully...The A-77 was a favorite

[@Mixarteaudio]

Very nice machine I had two A77 MkI 2 tracks and one MkIII 4 tracks I currently have a B77 4 tracks But I would like to get an A77 in optimal condition.a Hug

[@filamentheadrocco2644]

can you post a video on how to calibrate a revox a77

[@meshplates]

Is this a factory high speed? I have my doubts because you keep the speed selector switch out of your shots.

[@vladimirrajapu945]

Alles-good

[@Dutchsteammachine]

Do both tape guides need to be moving all bearings, or does the left one need to be fixed?

[@CompuKonstantin]

I’m a bit late, but only the left one needs to turn.

[@imsaint007]

Nice video I just got a Revox A77 MK4 its fast forward, rewinds when hit play the capstan engage but freezes not play , what could be the problem ?

[@lucamariaolgiati3297]

It needs a nice revision

[@edlightman4936]

I have a revox a77 its a older model removed from a cca radio automation unit its mounted on a rack panel . how do I remove the the control panel to replace the bulb for the power on light?

[@kolbenschieber]

Lay the machine on its back (horizontally). At first you pull off all the knobs and turning discs from the front (be careful with the mains switch knob, do not pry one-sidely, it may break!). Then remove the two screws left and right under the aluminium (or plastic-) lid and pull the panel upwards. It is held by four bolts in spring-sleeves and perhaps you have to use a screw driver between housing and panel to pry it loose. Then you can lift it off. The lamp is a 36 V/50 mA-type with socket Ba7s. Only the short version will fit (20-21mm lenght)!

[@zoltannagy1324]

hy i have revox mk4 and i have a problem, the vu meter in play mode not working, only in record mode working, so why?

[@lucamariaolgiati3297]

It is correct, it works in this way on the A77

[@JULIAN8845]

I HAVE A NEW SANDBLASTED CAPSTAN SHAFT FOR THIS IF IT HAS THRUST BEARINGMOTOR WHICH IT SHOULD HAVE BEING MK4

[@kolbenschieber]

How much do you want for this and from which country are you (because of the shipping costs)?

[@vfdffdd2675]

my speed is too LOW. The problem is with 21v and -6v

[@saitovrr]

В чём смысл этого видео???

[@dl1226]

Warum muss man ein schweres Gerät auf die Seite legen, wo Schalter und Potis sind???? Und das nicht nur einmal!!!! Wäre das meine Maschine und ich hätte das gesehen, würde ich ihnen das Gerät SOFORT aus den Händen reißen.

[@lucamariaolgiati3297]

Es ist klar, dass Sie keine Ahnung haben, wegen Labor und Reparaturen. Unten das Gerät ein weicher foam Teppich steht, es ist normal, und auch in ReVox Service war so gemacht. Keine andere Weg zu arbeiten, Sir.

[@dl1226]

@@lucamariaolgiati3297 Ich habe von Ihnen keine andere Antwort erwartet und Fehler werden grundsätzlich nicht zugegeben.

[@slobodanjozejoksimovic973]

Imate li koji za prodaju ali da ima svoje zvučnike i pojačalo i još dva izlaza zvučna

[@babalooey100]

God how I hate jazz music.