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Audio and Video Talk
Reel-to-Reel & Cassette Tapes
Revox B77 REAL time digital counter conversion - part 1 - the mechanicals..
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<blockquote data-quote="marcochezzi" data-source="post: 988744" data-attributes="member: 21001"><p>So fresh time, fresh ideas, this time I must make it work..</p><p></p><p>Air cushion problem suggestion - can it be true..</p><p></p><p>So on my working garage unit which you can see against the back wall to the left side of the Jeep, I removed the fixed exit roller guide slug, and replaced it with a bearing equal to the one on the inlet guide..</p><p></p><p>I know that there "could" be an impact on audio as this slug acts as a drag buffer of sort, but this is debatable..</p><p></p><p>Put the machine into play, the bearing spun as would be expected..</p><p></p><p>Put the machine into fast forward and then rewind, the bearing started up, but as reel wind speed grew, the bearing stopped!!! so yes, at speed there is air cushion over the slug or bearing, created by the tape movement, and the thing just stops, so that is no good as if I place a pulley there..</p><p></p><p>Damn...</p><p></p><p>But, the supply guide bearing does not stop, that continues to roll, properly..... brainfart moment....</p><p></p><p>So there the logic, the supply side has a tension arm, which directly influences the tape tension on the supply bearing, the exit side has no tension arm..</p><p></p><p>Plus, I received feedback that the counter roller on the PR99, which is in the same position as mine, has grooves repeatedly machined along its diameter, effectively getting rid of the air cushion effect..</p><p></p><p>Plus, the PR99 has an exit tension arm, which increases tape tension on the exit roller, and once again acts as the original exit slugs "flutter" damping...</p><p></p><p>Bingo...</p></blockquote><p></p>
[QUOTE="marcochezzi, post: 988744, member: 21001"] So fresh time, fresh ideas, this time I must make it work.. Air cushion problem suggestion - can it be true.. So on my working garage unit which you can see against the back wall to the left side of the Jeep, I removed the fixed exit roller guide slug, and replaced it with a bearing equal to the one on the inlet guide.. I know that there "could" be an impact on audio as this slug acts as a drag buffer of sort, but this is debatable.. Put the machine into play, the bearing spun as would be expected.. Put the machine into fast forward and then rewind, the bearing started up, but as reel wind speed grew, the bearing stopped!!! so yes, at speed there is air cushion over the slug or bearing, created by the tape movement, and the thing just stops, so that is no good as if I place a pulley there.. Damn... But, the supply guide bearing does not stop, that continues to roll, properly..... brainfart moment.... So there the logic, the supply side has a tension arm, which directly influences the tape tension on the supply bearing, the exit side has no tension arm.. Plus, I received feedback that the counter roller on the PR99, which is in the same position as mine, has grooves repeatedly machined along its diameter, effectively getting rid of the air cushion effect.. Plus, the PR99 has an exit tension arm, which increases tape tension on the exit roller, and once again acts as the original exit slugs "flutter" damping... Bingo... [/QUOTE]
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Audio and Video Talk
Reel-to-Reel & Cassette Tapes
Revox B77 REAL time digital counter conversion - part 1 - the mechanicals..
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