Revox A77 rebuild

[Audio Al]

I now own 3 A77's and none of them work properly :(

The latest purchase arrived 2 days ago , It's in lovely condition and was suposed to be in working order

I plugged it in last night and switched it on , The power bulb filckered along with one VU meter bulb , Then nothing , dead as a dodo .:(

Checked before switching on that it was on 240 volts Yes , Tested the external fuse OK

Removed the case and tested the 2 internal fuse's both test OK

Started haveing a look around inside with torch in hand and found this on the main power board
https://live.staticflickr.com/65535/49998835506_14ed939c3e_k.jpg (https://flic.kr/p/2jbe6S3)52CFFDD3-08C2-48B6-858B-A50B50A000BF (https://flic.kr/p/2jbe6S3) by [/url], on Flickr
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Should look like this
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.https://live.staticflickr.com/65535/49999087632_bf05afd9f9_k.jpg (https://www.flickr.com/photos/150639903@N08/)182FA3BD-8CD4-4F21-B50F-004328EEF85A (https://flic.kr/p/2jbfoP3) by [url=https://www.flickr.com/photos/150639903@N08/], on Flickr
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Even that one look decidedly dud

Decide to take the plunge and order a kit of parts to rebuild the boards all 7 also change the 3 big motor caps and some other bits , and the tape counter belt

All ordered , I now sit and wait :)

[Ali Tait]

Should be well worth doing Al, be nice machines once they’re up and running.

[Audio Al]

2 machines are 3.5 / 7.5 IPS and one is a ex studio 7.5 / 15 IPS :eyebrows:

[Audio Al]

This is what I have ordered
https://www.ebay.co.uk/itm/Revox-A77-suppressor-capacitor-and-resistor-repair-kit-0-47uF-310V-X2-rated/313091040173?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
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.https://www.ebay.co.uk/itm/REVOX-A77-FULL-RECAP-KIT-NICHICON-HIGH-QUALITY-CAPACITOR-UPGRADE/223951386360?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
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.https://www.ebay.co.uk/itm/Revox-Studer-B77-A77-PR99-LOCKDOWN-2020-DISCOUNT-1-WEEK-ONLY-RUN-MOTOR-CAPS/224042852174?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

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.https://www.ebay.co.uk/itm/223211538996

If anyone knows of other items that should be changed please advise :)

[Ali Tait]

2 machines are 3.5 / 7.5 IPS and one is a ex studio 7.5 / 15 IPS :eyebrows:

Nice, I’d be concentrating on the 15 ips. :-)

[Audio Al]

Nice, I’d be concentrating on the 15 ips. :-)

If the one I am doing now works out OK I will have a go at the 15IPs model :)

[Ali Tait]

The Tandberg I have is a 7.5 machine and sounds great.

[337alant]

yes those pesky Evox Rifa caps are guaranteed to fail can be real smoke / stink bombs as well, the Frako's, phillips, rodestine and tants all have to be replaced
The recap kits off Revox online are good as well Nichicon FC caps are nice for the Revox machines
Good luck with your rebuild it can be vary rewarding
I would recommend trying to fix what is wrong first if possible, then do the recap on a board at a time checking everything works each time.

Alan

[Audio Al]

:(

The new Sunstan caps arrived yesterday to replace the old Rifa Miniprint units

De soldered the old ones 1 unit at a time and put the new ones in, Thinking " It should at least power up now "

ANNNNNND Nothing :(

Checked the plug fuse OK

Checked the 2 internal fuses both OK

Now what :scratch:

Time to have a read of the service book me think's , Although most of it will be like hyroglifics to me :D

[337alant]

When you are powering up do you have any lights on at all Al?
Is the back off ?, there are 2 pins in the back panel the make the continuity to the 240V power

Alan

[Audio Al]

No lights at all , I did slip the wooden cover back on so the 2 pins were in place , It also said you can make up a jumper cable using 2 x 4mm banana plugs

[Audio Al]

:doh:

Who had a AudioAl moment , Me I did :(

You need to put the remote plug back in when you re fit the case or it wont work :doh::doh:

It now powers up , The capstan bearings sound a bit lumpy :(

I will try putting a tape on it later , Not holding out much hope for it actually playing OK , Time will tell

[337alant]

hows the recap going Al ?

Alan

[Audio Al]

hows the recap going Al ?

Alan


Alan

Currently life is in the way inc work and a off spell with the diabetes :( I went all strange , more than normal

[Barry]

Alan

Currently life is in the way inc work and a off spell with the diabetes :( I went all strange , more than normal

Do you take medication for your diabetes Al? Did you have a hypoglycaemic episode?

[Audio Al]

Do you take medication for your diabetes Al? Did you have a hypoglycaemic episode?

Yep i'm on Metformin tabs 4 500mg a day and one Trajenta 5mg
Trouble is they don't give you test strips for the blood suger level monitor , so I have no way of knowing what it is
Should be around 6 and when I conked out I was at 17.4 , Have been as high as 23 :eek:
I lost all sence of balance , staggering around like a drunk and having to hold on as I walked around the house or I would go over , Called 111 NHS they had a docter call me at home and on the advise given I was advised to go straight into A&E
8 hours later after many testd CT scan X-ray and all sorts af extractions I was kicked out , Had to get a bus home as I was not up to driving as I went by cab

Ho Hum life is variable ;)

[Barry]

The manufacturer of blood sugar monitors are sneaky - the monitor and a few test strips are given for free, but they will charge you a lot for replacement strips.

Glad to hear you are now "back on an even keel", it must have been frightening at the time!

After I was daignosed with Type II I was prescribed Glycicide, which could cause 'hypos'. It was also a PITA having to take them 20 minutes before eating. Anyway after about a year (of me complaing about the inconvenience of it all) and having a more than acceptable blood sugar level, they took me off all medication. Thanks to watching my diet I am now officially in remission (initially they said I had 'recovered', but apparently there is no such thing! :scratch:) My HaB1c is 39, which is the same for a normal healthy person (< 42).

Apologies for the tread drift.

[Audio Al]

The manufacturer of blood sugar monitors are sneaky - the monitor and a few test strips are given for free, but they will charge you a lot for replacement strips.

Glad to hear you are now "back on an even keel", it must have been frightening at the time!

After I was daignosed with Type II I was prescribed Glycicide, which could cause 'hypos'. It was also a PITA having to take them 20 minutes before eating. Anyway after about a year (of me complaing about the inconvenience of it all) and having a more than acceptable blood sugar level, they took me off all medication. Thanks to watching my diet I am now officially in remission (initially they said I had 'recovered', but apparently there is no such thing! :scratch:) My HaB1c is 39, which is the same for a normal healthy person (< 42).

Apologies for the tread drift.

Pleased for you Barry if you have it under control , Result
I was told of by the nurse , Now they are wanting to restrict even mor what I eat :(