Ooops maybe i was thinking about special alignment tapes....again I heard this at different manufacturer's schools and it kinda stuck in my mind like a bad date...but i'm pretty sure that vhs tape is "printed" not actually recorded. ----- Original Message ----- From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Friday, November 23, 2001 10:57 PM Subject: [TechAssist] Re: AC head adj. > > Ray: > A reader on this list provided me with 3 links relating to "Optically" recorded > magnetic media. It appears that it is related to 8 mm and only on special tape. > > I still contend that optically recorded alignment tapes, for consumer version > VCR's, are not a reality because of the different composition of the media and > foot print the optical track leaves. The optical track width is 0.15um when a > standard VHS SLP track width of 1 field of video is 19um wide. > > I don't see the benefit of designing an optical recording format that will be > compatible with a standard VHS playback process. In theory optical recording > could increase the amount of data stored on a conventional VHS tape at least ten > times. Why would they engineer a format that would not take full advantage of > that gain of storage area? > It does not seem logical that millions of $$ would be spent to design a system > to optically record to standard VHS tape and have it compatible with our good > old 20 year + VHS magnetically recorded tapes. > > Below are the links that Mr. Adams provided me and I will provide for those who > care to read about optical recording on magnetic media. > > http://www.strl.nhk.or.jp/results/annual/r35.html#i3 > http://www.nist.gov/public_affairs/guide/atp09.htm > http://www.jsap.or.jp/ap/1998/ob6701/p670058.html > > Dennis Viereck > > > > > Ray Lufkin wrote: > > > Hi Dennis, > > Not sure how tape is recorded at the factory but at alot of industry > > schools i've been to always referred to the tape being optically recorded. I > > don't believe the tape has touched metal before you put it in your vcr.. Can > > you imagine how long it would take to record all the tapes out there in the > > world? No its a manufacturing process. I have some book somewhere that has a > > description about it. See if I can find it. In the meantime have a nice > > Thanksgiving! > > > > ----- Original Message ----- > > From: "Dennis Viereck" <wa6ati@xxxxxxxxxxxxxx> > > To: <techassist@xxxxxxxxxxxxx> > > Sent: Thursday, November 22, 2001 12:32 PM > > Subject: [TechAssist] Re: AC head adj. > > > > > Ray > > > In your response you made reference to a specific tape, "Must be an > > > optically recorded tape " I have never heard of this type of tape. What is > > it? > > > My understanding of video tape is that it is 100% magnetic media. How does > > > optics play into this? > > > > > > I understand that the magnetic footprint placed on the tape must match a > > VHS > > > standard. That is why the master must be recorded accurately to make all > > VHS > > > machines compatible to the VHS standard. > > > > > > Dennis Viereck > > > > > > > > > Ray Lufkin wrote: > > > > > > > To adjust a/c head find the control track pulse usually around the servo > > > > multi monostable area. Find it with your scope and adjust ac head height > > > > (big screww on thread) using the big screw for maximum control track > > pulse > > > > amplitude. Then adjust azimuth for crisp audio. Use a high quality new > > > > pre-recorded movie tape not one recorded on another vcr. Must be an > > > > optically recorded tape or it will have ac error already on it.sAll > > > > adjustments should be very close to start with so if you have to crank > > them > > > > something is wrong. Alot times it's a bad pinch roller crushing and > > pulling > > > > the tape off the phsical track of the head. Best way to test for that is > > see > > > > how the tape path looks in search modes.Watch tape path closely and go > > in > > > > forward/reverse tape search and look for crinklies. Been working on > > vcr's > > > > since 1981. > > > > > > > > ----- Original Message ----- > > > > From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx> > > > > To: <techassist@xxxxxxxxxxxxx> > > > > Sent: Thursday, November 22, 2001 11:04 AM > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60 > > > > > > > > > > > > > > Haven't adjusted them. > > > > > I like to leave them alone, especially in stereo/hifi sets. > > > > > But may have to, as a last resort. > > > > > > > > > > -Ed- > > > > > > > > > > teltek@xxxxxxxxxxx > > > > > TEL-TEK ELECTRONICS. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > From: "Jeff Dougherty" <jeff@xxxxxxxxxxxxxxxxxx> > > > > > To: <techassist@xxxxxxxxxxxxx> > > > > > Sent: Thursday, November 22, 2001 10:31 AM > > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60 > > > > > > > > > > > > > > > > > > > > > > There are two or three screws at the base of the Ac heads. > > > > > > Do not adjust them too far. If you do, it could take a lot of time > > to > > > > get > > > > > > the audio tracking close to what it was originally. > > > > > > You use the adjustments for the head tilt and azimuth > > > > > > > > > > > > Jeff > > > > > > mailto:Jeff@xxxxxxxxxxxxxxxxxx www.9-11-2001tragedy.com > > > > > > FAX 1-413-280-0677 > > > > > > Intrepid Video & Electronics > > > > > > Harrisburg, PA 17111 > > > > > > 717-909-8844 > > > > > > www.intrepid-video.com www.tech-repair.net www.thetoolcaddy.com > > > > > > ----- Original Message ----- > > > > > > From: "Shaun" <ssroark@xxxxxxxx> > > > > > > To: <techassist@xxxxxxxxxxxxx> > > > > > > Sent: Thursday, November 22, 2001 12:07 AM > > > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60 > > > > > > > > > > > > > > > > > > > > > > > > > > do you know how to adjust the audio head? > > > > > > > ----- Original Message ----- > > > > > > > From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx> > > > > > > > To: <techassist@xxxxxxxxxxxxx> > > > > > > > Sent: Wednesday, November 21, 2001 11:22 AM > > > > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > It's Stereo/HiFi, cleaned all the heads..no go. > > > > > > > > > > > > > > > > -Ed- > > > > > > > > teltek@xxxxxxxxxxx > > > > > > > > TEL-TEK ELECTRONICS. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > > > From: "Phillip R. Hull" <phil245@xxxxxxxxxxxxx> > > > > > > > > To: <techassist@xxxxxxxxxxxxx> > > > > > > > > Sent: Wednesday, November 21, 2001 11:16 AM > > > > > > > > Subject: [TechAssist] Re: Older RCA VCR PSVR60 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Did you clean control/audio head?? Head could be bad or is > > this a > > > > > HI > > > > > > FI > > > > > > > > > audio unit with audio heads on Video head drum, If so try > > > > cleaning > > > > > > the > > > > > > > > > head assy . > > > > > > > > > Phillip R Hull > > > > > > > > > phil245@xxxxxxxxxxxxx > > > > > > > > > ----- Original Message ----- > > > > > > > > > From: "Tel-Tek Electronics" <teltek@xxxxxxxxxxx> > > > > > > > > > To: "AAAA TECH-ASSIST" <techassist@xxxxxxxxxxxxx> > > > > > > > > > Sent: Wednesday, November 21, 2001 11:07 AM > > > > > > > > > Subject: [TechAssist] Older RCA VCR PSVR60 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Model PSVR60 > > > > > > > > > > > > > > > > > > > > Have a VCR here that came in with no sound. > > > > > > > > > > Found a module that looks very similar to the Sony > > SBX1637-11, > > > > > which > > > > > > I > > > > > > > > > > replaced. Brought the low volume back from tuner. > > > > > > > > > > But when tape is played, the audio sounds a little raspy, > > almost > > > > > > like > > > > > > > > > > cracked speaker. > > > > > > > > > > My question....is this module replaceable with the > > SBX1637-11, > > > > or > > > > > am > > > > > > I > > > > > > > > > > looking for more sound problems. > > > > > > > > > > This is an older VCR, 10 years, approx. > > > > > > > > > > > > > > > > > > > > TIA. > > > > > > > > > > > > > > > > > > > > -Ed- > > > > > > > > > > > > > > > > > > > > teltek@xxxxxxxxxxx > > > > > > > > > > TEL-TEK ELECTRONICS. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ================================= > > > > > > > > > > Help make your TechAssist database better! > > > > > > > > > > Submit your fixes here: > > > > > http://circuitwork.com/techassist/tip/#tips > > > > > > > > > > ================================= > > > > > > > > > > To UNSUBSCRIBE your email address, click here: > > > > > > > > > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ================================= > > > > > > > > > Help make your TechAssist database better! > > > > > > > > > Submit your fixes here: > > > > http://circuitwork.com/techassist/tip/#tips > > > > > > > > > ================================= > > > > > > > > > To UNSUBSCRIBE your email address, click here: > > > > > > > > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ================================= > > > > > > > > Help make your TechAssist database better! > > > > > > > > Submit your fixes here: > > http://circuitwork.com/techassist/tip/#tips > > > > > > > > ================================= > > > > > > > > To UNSUBSCRIBE your email address, click here: > > > > > > > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > > > > > > > > > > > > > > > > > > > > > ================================= > > > > > > > Help make your TechAssist database better! > > > > > > > Submit your fixes here: > > http://circuitwork.com/techassist/tip/#tips > > > > > > > ================================= > > > > > > > To UNSUBSCRIBE your email address, click here: > > > > > > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > > > > > > > > > > > > > > > > > > > > > > > > > ================================= > > > > > > Help make your TechAssist database better! > > > > > > Submit your fixes here: http://circuitwork.com/techassist/tip/#tips > > > > > > ================================= > > > > > > To UNSUBSCRIBE your email address, click here: > > > > > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > > > > > > > > > > > > > > > ================================= > > > > > Help make your TechAssist database better! > > > > > Submit your fixes here: http://circuitwork.com/techassist/tip/#tips > > > > > ================================= > > > > > To UNSUBSCRIBE your email address, click here: > > > > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > > > > > > > > > > > > ================================= > > > > Help make your TechAssist database better! > > > > Submit your fixes here: http://circuitwork.com/techassist/tip/#tips > > > > ================================= > > > > To UNSUBSCRIBE your email address, click here: > > > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > > > > > > > > ================================= > > > Help make your TechAssist database better! > > > Submit your fixes here: http://circuitwork.com/techassist/tip/#tips > > > ================================= > > > To UNSUBSCRIBE your email address, click here: > > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > > > > > > ================================= > > Help make your TechAssist database better! > > Submit your fixes here: http://circuitwork.com/techassist/tip/#tips > > ================================= > > To UNSUBSCRIBE your email address, click here: > > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > > ================================= > Help make your TechAssist database better! > Submit your fixes here: http://circuitwork.com/techassist/tip/#tips > ================================= > To UNSUBSCRIBE your email address, click here: > mailto:techassist-request@xxxxxxxxxxxxx?subject=unsubscribe > ================================= Help make your TechAssist database better! 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