Revox A77 tape drive board - UK Vintage Radio Repair and Restoration Discussion Forum

Ken Clark · 11th Apr 2020, 4:47 am

I am replacing the tape drive board after removing it for mods.
Is it only attached by the four screws at the front?
If so, it sags noticeably at the rear due to the weight of the relays.

Michael Maurice · 11th Apr 2020, 2:59 pm

You are correct, it is held in by the front screws. The board sagging has never been a problem. The relays are not heavy.

Ken Clark · 14th Apr 2020, 3:25 am

Thanks Michael.

Just looks odd when everything else is so Swiss & precise.

DMcMahon · 14th Apr 2020, 2:37 pm

I have not removed the Tape Drive Board before, I do plan to, in the fairly near future to replace a suspect transistor for inoperative EOT sensor circuit, so thought I would have a quick run through it.

Yes as you say when the 2 securing screws are loosened/removed (you said 4 ?) it sags down under its own weight because there is really nothing to hold/support it, maybe Revox should have engineered it better.

11th Apr 2020, 4:47 am	#1
Ken Clark Diode Join Date: Apr 2019 Location: Bowral, New South Wales, Australia Posts: 5	Revox A77 tape drive board I am replacing the tape drive board after removing it for mods. Is it only attached by the four screws at the front? If so, it sags noticeably at the rear due to the weight of the relays.

11th Apr 2020, 2:59 pm	#2
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,223	Re: Revox A77 tape drive board You are correct, it is held in by the front screws. The board sagging has never been a problem. The relays are not heavy. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/

14th Apr 2020, 3:25 am	#3
Ken Clark Diode Join Date: Apr 2019 Location: Bowral, New South Wales, Australia Posts: 5	Re: Revox A77 tape drive board Thanks Michael. Just looks odd when everything else is so Swiss & precise.

14th Apr 2020, 2:37 pm	#4
DMcMahon Dekatron Join Date: Apr 2019 Location: Worthing, West Sussex, UK. Posts: 6,600	Re: Revox A77 tape drive board I have not removed the Tape Drive Board before, I do plan to, in the fairly near future to replace a suspect transistor for inoperative EOT sensor circuit, so thought I would have a quick run through it. Yes as you say when the 2 securing screws are loosened/removed (you said 4 ?) it sags down under its own weight because there is really nothing to hold/support it, maybe Revox should have engineered it better.