Problem in recording with both sides in Revox PR99 MKII - UK Vintage Radio Repair and Restoration Discussion Forum

matigud · 5th Jun 2018, 8:14 pm

Good day! I'm Matias and I wanted to know if you can help me urgently!
I have a problem with my Revox 99 MKII and I wanted to know if you could guide me with what things I should buy or what should I do.
My Revox PR99 MKII records perfect only to one side (L) and to R comes only volume gain noise, no pink noise, no noise, only does not record R.
One person told me that I could replace the boards with a working device, such as Record amp and Oscillator.
I do not know if that could be the problem and it would be great if you guys can guide me with that or if you know a website with support to send an email, it would also be helpful.
Thank you for the help!

ben · 5th Jun 2018, 11:04 pm

Hello and welcome.
First things first: can you feed a signal from for example, a CD player into the R channel and monitor it (or get meter movement?)

Radio Wrangler · 6th Jun 2018, 7:35 am

There were many versions of the PR99 made. Some record each channel on 1/4 of the tape width, some record each channel on 1/2 of the tape width. Some were made for replay only. The first step is to identify which version you have.

If it is a stereo one and one channel isn't working the first thing to check is that the switches are all in the correct positions for what you want to do. After that there is the possibility of dirty contacts on the switches or the printed circuit board connectors. Then there is the possibility of failures in the electronics, and the possibility of just a head being fouled with built-up oxide. Worst of all is the possibility of a failed head.

Start by cleaning the heads and checking switch positions. I use an A77 so I'm not familiar enough with PR99 controls to give guidance.

David

Michael Maurice · 6th Jun 2018, 10:09 pm

As Ben says, feed a source say a CD player into the line in, you'll probably need to use XLR to phono connectors

Switch the monitor switch to input, make sure both record switches are up and that both input selectors are in AUX mode, turn the input level controls up. You should get readings on BOTH meters.

Come back and tell us what readings you have.

5th Jun 2018, 8:14 pm	#1
matigud Retired Dormant Member Join Date: Jun 2018 Location: Freiberg, Germany Posts: 1	Problem in recording with both sides in Revox PR99 MKII Good day! I'm Matias and I wanted to know if you can help me urgently! I have a problem with my Revox 99 MKII and I wanted to know if you could guide me with what things I should buy or what should I do. My Revox PR99 MKII records perfect only to one side (L) and to R comes only volume gain noise, no pink noise, no noise, only does not record R. One person told me that I could replace the boards with a working device, such as Record amp and Oscillator. I do not know if that could be the problem and it would be great if you guys can guide me with that or if you know a website with support to send an email, it would also be helpful. Thank you for the help!

5th Jun 2018, 11:04 pm	#2
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Problem in recording with both sides in Revox PR99 MKII Hello and welcome. First things first: can you feed a signal from for example, a CD player into the R channel and monitor it (or get meter movement?) __________________ Regards, Ben.

6th Jun 2018, 7:35 am	#3
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,872	Re: Problem in recording with both sides in Revox PR99 MKII There were many versions of the PR99 made. Some record each channel on 1/4 of the tape width, some record each channel on 1/2 of the tape width. Some were made for replay only. The first step is to identify which version you have. If it is a stereo one and one channel isn't working the first thing to check is that the switches are all in the correct positions for what you want to do. After that there is the possibility of dirty contacts on the switches or the printed circuit board connectors. Then there is the possibility of failures in the electronics, and the possibility of just a head being fouled with built-up oxide. Worst of all is the possibility of a failed head. Start by cleaning the heads and checking switch positions. I use an A77 so I'm not familiar enough with PR99 controls to give guidance. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

6th Jun 2018, 10:09 pm	#4
Michael Maurice Moderator Join Date: Feb 2006 Location: Wembley, Middlesex Posts: 7,224	Re: Problem in recording with both sides in Revox PR99 MKII As Ben says, feed a source say a CD player into the line in, you'll probably need to use XLR to phono connectors Switch the monitor switch to input, make sure both record switches are up and that both input selectors are in AUX mode, turn the input level controls up. You should get readings on BOTH meters. Come back and tell us what readings you have. __________________ Forum Moderator http://www.michaelmauricerepairs.co.uk/