Vintage HiFi Audio Forum

Repair / Help Forum => Repair / Help => Topic started by: OldiesButGoodies on May 16, 2015, 12:38:03 PM

Title: woke up to find the man cave in slight disarray
Post by: OldiesButGoodies on May 16, 2015, 12:38:03 PM
apparently I closed Friday night by digging into the Otari's preamp calibration settings while under the influence of IPA. Seems to have worked cuz I just recorded Patty Barber's Companion LP and it sounds pretty good (there is some incredible bass in that LP - like shake the house bass drum action).  :P

(https://c2.staticflickr.com/6/5347/17115008613_9767fd38bd_z.jpg) (https://flic.kr/p/s5oTMp)IMG_2628 (https://flic.kr/p/s5oTMp) by Jose Sifontes (https://www.flickr.com/photos/jsifontes/), on Flickr
Title: Re: woke up to find the man cave in slight disarray
Post by: Sir Thrift-a-Lot on May 16, 2015, 03:24:29 PM
Pepe, a beer lover with a tape problem!
Title: Re: woke up to find the man cave in slight disarray
Post by: MacGeek on May 16, 2015, 07:03:54 PM
Pepe-that board flips down, if it helps.
Title: Re: woke up to find the man cave in slight disarray
Post by: OldiesButGoodies on May 16, 2015, 07:13:35 PM
The top board?  Did not know that. But the one that I mess with a lot is the bottom one though.
Title: Re: woke up to find the man cave in slight disarray
Post by: MacGeek on May 16, 2015, 07:55:17 PM
The bottom one, if it's the bigger one.
Title: Re: woke up to find the man cave in slight disarray
Post by: OldiesButGoodies on May 16, 2015, 08:29:34 PM
The audio amp board is the one at the bottom (low freq comp,  equalization, record/repro levels etc.).  The service manual does not mention that convenience. Will explore it next time I crack it open.  I am now working on a Revox B77 and the Otari is closed up. 
Title: Re: woke up to find the man cave in slight disarray
Post by: papabearjew on May 17, 2015, 04:09:12 PM
My ReVox B77 plays for 15-20 minutes then the left channel dies. Ideas? No smart ass comments please. If I wasn't that I'll just ask BJ.
Title: Re: woke up to find the man cave in slight disarray
Post by: OldiesButGoodies on May 17, 2015, 07:30:44 PM
Try re-seating all the cards,  specially the reproduce amp card, second from the right (and/or take it out and clean the contacts with isopropyl alcohol).  Borrow a spare reproduce card from a known good unit and see if that fixes it.   :-\