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Revox A77 Recapping
Old 20th September 2012
  #1
Gear Maniac
 
Aniol1349's Avatar
 
🎧 5 years
Revox A77 Recapping

Hey!

I recently bought my Revox a77 and I'm about to recapp this beautiful machine..
I have some soldering skills and some understanding of how electronics works but I never did any restorations.

I know that I will probably need to replace all the Rifa and Frako caps.

Do I need to replace the small electrolytic ones as well?

Do I need to go for any particular manufacturer for the replacements, or just any with the same value and type will work?

I was doing a search over the forums but I couldn't find anywhere any info on recapping this piece of equipment.

I hope someone could share with me some info on this!

Thanks!
Old 21st September 2012
  #2
Gear Maniac
 
🎧 10 years
You might want to check in at www.tapeheads.net--I guarantee you will find the answers you seek there.

You WILL need to replace the Rifa and Frako (flake-o) caps. Especially the spark killers on the transport control PC board. And all the other caps (starting with any and all electrolytics) are a good idea straightaway. The last of the Mk 4 edition of this deck is by now 35 years old at which time the B77 made its debut and superseded it....and the earlier versions of the A77 aren't getting any younger.

The same capacitance (within perhaps 5%) is OK; if the exact working voltage can't be found in a new item go with the next highest working voltage available. NEVER replace with a new part of lower working voltage than the originals. If you do you will almost certainly get a bang out of the machine of the most unfortunate kind!

Good luck--I hope this helps!
Old 25th September 2012
  #3
Gear Nut
 
🎧 10 years
Quote:
Originally Posted by Aniol1349 ➡️

I was doing a search over the forums but I couldn't find anywhere any info on recapping this piece of equipment.

Thanks!
You can download A77 service information from here:
ftp://ftp.studer.ch/Public/Products/Revox/Revox_A77/
Old 27th September 2012
  #4
Gear Head
 
miles_stevens's Avatar
 
🎧 5 years
Thanks for that! I'm just about to start an A-77 recap myself.
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