DAT "video" head replacement?

N

N_Cook

Guest
Sony DAT audio DTC 690 drum assembly/ DOU-03A/ 8-848-567-11
Initially, anyone know how to get the top drum off, I don't want to heat
up to separate interference fit , if there is some secret fixing.
Then anyone happen to know if video heads are the same, they look the
same via what little I can see of them.
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:l0a05m$6bl$1@dont-email.me...
Sony DAT audio DTC 690 drum assembly/ DOU-03A/ 8-848-567-11
Initially, anyone know how to get the top drum off, I don't want to heat
up to separate interference fit , if there is some secret fixing.
Then anyone happen to know if video heads are the same, they look the same
via what little I can see of them.
Click to expand...


Video heads are a damn sight bigger than DAT heads, but the principle of
operation is exactly the same.
Some portable DAT players used an even smaller head, but you had to wrap
more than 90 degrees of tape around it to compensate, not good in terms of
tape friction/tension etc.

I used to fix a lot of DAT's, but never once felt inclined to take a head
apart.



Cheers,

Gareth.
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:l0a05m$6bl$1@dont-email.me...
Sony DAT audio DTC 690 drum assembly/ DOU-03A/ 8-848-567-11
Initially, anyone know how to get the top drum off, I don't want to heat
up to separate interference fit , if there is some secret fixing.
Then anyone happen to know if video heads are the same, they look the same
via what little I can see of them.
Click to expand...

BTW, if you remove the head or move anything else, you will need to realign
the tape path, and you won't be able to do that properly without an
alignment tape.

Ideally you also need a tension tape to measure and adjust back tension.



Gareth.
 
On 05/09/2013 15:06, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:l0a05m$6bl$1@dont-email.me...
Sony DAT audio DTC 690 drum assembly/ DOU-03A/ 8-848-567-11
Initially, anyone know how to get the top drum off, I don't want to heat
up to separate interference fit , if there is some secret fixing.
Then anyone happen to know if video heads are the same, they look the same
via what little I can see of them.


BTW, if you remove the head or move anything else, you will need to realign
the tape path, and you won't be able to do that properly without an
alignment tape.

Ideally you also need a tension tape to measure and adjust back tension.



Gareth.
Click to expand...

I can't make things worse. Smashed up heads, probably from foam breaking
up / snagging on the silly "head-dirtier" arm
 
"N_Cook" wrote in message news:l0c1ij$b6j$1@dont-email.me...

On 05/09/2013 15:06, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:l0a05m$6bl$1@dont-email.me...
Sony DAT audio DTC 690 drum assembly/ DOU-03A/ 8-848-567-11
Initially, anyone know how to get the top drum off, I don't want to heat
up to separate interference fit , if there is some secret fixing.
Then anyone happen to know if video heads are the same, they look the
same
via what little I can see of them.


BTW, if you remove the head or move anything else, you will need to
realign
the tape path, and you won't be able to do that properly without an
alignment tape.

Ideally you also need a tension tape to measure and adjust back tension.



Gareth.
Click to expand...

I can't make things worse. Smashed up heads, probably from foam breaking
up / snagging on the silly "head-dirtier" arm



Or someone trying to clean them with a cotton bud or something.
I always used to use ordinary copy paper soaked in alcohol, so you can feel
with your fingertip exactly what is happening to the heads as they are
cleaned.


If you ever get into a position where you get this working, I can give some
tips how to attempt a realignment without an alignment tape.



Cheers,

Gareth.
 
N_Cook <diverse@tcp.co.uk> wrote:
On 05/09/2013 15:06, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:l0a05m$6bl$1@dont-email.me...
Sony DAT audio DTC 690 drum assembly/ DOU-03A/ 8-848-567-11
Initially, anyone know how to get the top drum off, I don't want to heat
up to separate interference fit , if there is some secret fixing.
Then anyone happen to know if video heads are the same, they look the same
via what little I can see of them.


BTW, if you remove the head or move anything else, you will need to realign
the tape path, and you won't be able to do that properly without an
alignment tape.

Ideally you also need a tension tape to measure and adjust back tension.



Gareth.



I can't make things worse. Smashed up heads, probably from foam breaking
up / snagging on the silly "head-dirtier" arm
Click to expand...

nice.

just curious, who even sells DAT heads, let alone in 2013?
 
Good question. ASTI doesn't have them and everyone who says they can backorder them prices them at arouind $800.

Gotta have a real need.....
 
I managed to make a small hub puller out of an old pair of basic wire
strippers and circlip pliers and a minute of low heat from a hot air gun
to pull the 6 pole magnet disc from the underside, without damage. After
taking measurements of the 2 gaps, to the nearest thou. Next week I'll
try removing the top disc from the middle disc, again interference fit
and again nothing to really get a hold of for hub pulling action.
Probably will be some protective tape around the bottom drum (non tape
path part) then a l
jubilee clip as I don't think the few 1.5mm threaded holes in aluminiun
would take the strain.
 
"N_Cook" wrote in message news:l0d7l3$u1g$1@dont-email.me...

I managed to make a small hub puller out of an old pair of basic wire
strippers and circlip pliers and a minute of low heat from a hot air gun
to pull the 6 pole magnet disc from the underside, without damage. After
taking measurements of the 2 gaps, to the nearest thou. Next week I'll
try removing the top disc from the middle disc, again interference fit
and again nothing to really get a hold of for hub pulling action.
Probably will be some protective tape around the bottom drum (non tape
path part) then a l
jubilee clip as I don't think the few 1.5mm threaded holes in aluminiun
would take the strain.



Good luck, I have always assumed these things are assembled with the idea
they will never have to be disassembled.



Gareth.
 
On 06/09/2013 20:40, Cydrome Leader wrote:
N_Cook <diverse@tcp.co.uk> wrote:
On 05/09/2013 15:06, Gareth Magennis wrote:
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:l0a05m$6bl$1@dont-email.me...
Sony DAT audio DTC 690 drum assembly/ DOU-03A/ 8-848-567-11
Initially, anyone know how to get the top drum off, I don't want to heat
up to separate interference fit , if there is some secret fixing.
Then anyone happen to know if video heads are the same, they look the same
via what little I can see of them.


BTW, if you remove the head or move anything else, you will need to realign
the tape path, and you won't be able to do that properly without an
alignment tape.

Ideally you also need a tension tape to measure and adjust back tension.



Gareth.



I can't make things worse. Smashed up heads, probably from foam breaking
up / snagging on the silly "head-dirtier" arm

nice.

just curious, who even sells DAT heads, let alone in 2013?
Click to expand...

Available at Megabucks.
Discovered one thing, so far. There are 2 magnets on the disc I removed.
The disc is probably mu-metal with strong 6 pole motor magnet below and
a weak thin disc above to energise a castellated pcb track for a tacho.
I suppose the mu-metal is to stop the rotating main field from directly
coupling with the heads or the transfer coils,one pair is static and one
pair rotating relative to the magnets wheras the video heads are static
relatively speaking, and the weak one is too weak to affect more than a
couple of mm away from it
 
I've decided , when I get back to it , to drill matching 8 holes in a
plate and hope 8x 1mm screws, 5 threads each, will hold in place while
trying to separate the 2 drums
 
Yes, but that doesn't solve the "betamax syndrome".

This is when you have a bunch of beta tapes of your kids and all that and you haven't dubbed them or anything and absolutely positively must have a beta machine to play them.
 
On 09/07/2013 04:19 AM, N_Cook wrote:
I've decided , when I get back to it , to drill matching 8 holes in a
plate and hope 8x 1mm screws, 5 threads each, will hold in place while
trying to separate the 2 drums
Click to expand...

It has been my experience that once you start cleaning a rotary head
with qtips and alcohol the head is gone. If the '"dirty up" brush, then
a cleaning tape, won't clear things the head is gone. It is not
cost-effective to replace. You can buy an SSD based recorder/player for
way less than the cost of a new drum.
 
"dave" wrote in message
news:UIudnaxVv-cnsrbPnZ2dnUVZ_gadnZ2d@earthlink.com...

On 09/07/2013 04:19 AM, N_Cook wrote:
I've decided , when I get back to it , to drill matching 8 holes in a
plate and hope 8x 1mm screws, 5 threads each, will hold in place while
trying to separate the 2 drums
Click to expand...

It has been my experience that once you start cleaning a rotary head
with qtips and alcohol the head is gone.





That might be because cleaning a DAT head with a Q tip is the fastest way to
destroy it.




Gareth.
 
On 09/07/2013 03:48 PM, Gareth Magennis wrote:
"dave" wrote in message
news:UIudnaxVv-cnsrbPnZ2dnUVZ_gadnZ2d@earthlink.com...

On 09/07/2013 04:19 AM, N_Cook wrote:
I've decided , when I get back to it , to drill matching 8 holes in a
plate and hope 8x 1mm screws, 5 threads each, will hold in place while
trying to separate the 2 drums

It has been my experience that once you start cleaning a rotary head
with qtips and alcohol the head is gone.





That might be because cleaning a DAT head with a Q tip is the fastest
way to destroy it.




Gareth.
Click to expand...

It's already gone if you have to try "anything". The best way to keep
those decks clean is to not use junk tape. The little brush cannot get
clogged.
 
"dave" wrote in message
news:r4OdncLPEvfqdLbPnZ2dnUVZ_v2dnZ2d@earthlink.com...

On 09/07/2013 03:48 PM, Gareth Magennis wrote:
"dave" wrote in message
news:UIudnaxVv-cnsrbPnZ2dnUVZ_gadnZ2d@earthlink.com...

On 09/07/2013 04:19 AM, N_Cook wrote:
I've decided , when I get back to it , to drill matching 8 holes in a
plate and hope 8x 1mm screws, 5 threads each, will hold in place while
trying to separate the 2 drums

It has been my experience that once you start cleaning a rotary head
with qtips and alcohol the head is gone.





That might be because cleaning a DAT head with a Q tip is the fastest
way to destroy it.




Gareth.
Click to expand...

It's already gone if you have to try "anything". The best way to keep
those decks clean is to not use junk tape. The little brush cannot get
clogged.





I don't understand your claim here.
I have come across many a DAT where one head output is minimal, causing
glitching, but cleaning it restores it back to health.
Its amazing how much black sludge can come off these heads.

And like most things of this nature, "cleaning tapes" or that silly brush
thing just don't work, you have to get in there and do it properly by hand.


Gareth.
 
On Saturday, September 7, 2013 8:57:28 AM UTC-7, jurb...@gmail.com wrote:
Yes, but that doesn't solve the "betamax syndrome".



This is when you have a bunch of beta tapes of your kids and all that and you haven't dubbed them or anything and absolutely positively must have a beta machine to play them.
Click to expand...

Bought an SLHF-300 (Beta) on eBay last week for $70 total. It works fine but I blew out a LOT of dust before cleaning and checking it.

It seems better than half the Beta machines on eBay are 'for parts or repair'. I have an SLHF-900 I'm sure has a bad cap or 2 preventing the capstan servo from locking. Just too lazy to get out the scope so the $70 was my easy way out.

G˛
 
On 09/08/2013 10:47 AM, Gareth Magennis wrote:
"dave" wrote in message
news:r4OdncLPEvfqdLbPnZ2dnUVZ_v2dnZ2d@earthlink.com...

On 09/07/2013 03:48 PM, Gareth Magennis wrote:


"dave" wrote in message
news:UIudnaxVv-cnsrbPnZ2dnUVZ_gadnZ2d@earthlink.com...

On 09/07/2013 04:19 AM, N_Cook wrote:
I've decided , when I get back to it , to drill matching 8 holes in a
plate and hope 8x 1mm screws, 5 threads each, will hold in place while
trying to separate the 2 drums

It has been my experience that once you start cleaning a rotary head
with qtips and alcohol the head is gone.





That might be because cleaning a DAT head with a Q tip is the fastest
way to destroy it.




Gareth.

It's already gone if you have to try "anything". The best way to keep
those decks clean is to not use junk tape. The little brush cannot get
clogged.





I don't understand your claim here.
I have come across many a DAT where one head output is minimal, causing
glitching, but cleaning it restores it back to health.
Its amazing how much black sludge can come off these heads.

And like most things of this nature, "cleaning tapes" or that silly
brush thing just don't work, you have to get in there and do it properly
by hand.


Gareth.
Click to expand...

Those are contacts, not the head gaps. Where is your "black sludge"
coming from?
 
"dave" wrote in message
news:7v6dnenvL-cUV7DPnZ2dnUVZ_u6dnZ2d@earthlink.com...

On 09/08/2013 10:47 AM, Gareth Magennis wrote:
"dave" wrote in message
news:r4OdncLPEvfqdLbPnZ2dnUVZ_v2dnZ2d@earthlink.com...

On 09/07/2013 03:48 PM, Gareth Magennis wrote:


"dave" wrote in message
news:UIudnaxVv-cnsrbPnZ2dnUVZ_gadnZ2d@earthlink.com...

On 09/07/2013 04:19 AM, N_Cook wrote:
I've decided , when I get back to it , to drill matching 8 holes in a
plate and hope 8x 1mm screws, 5 threads each, will hold in place while
trying to separate the 2 drums

It has been my experience that once you start cleaning a rotary head
with qtips and alcohol the head is gone.





That might be because cleaning a DAT head with a Q tip is the fastest
way to destroy it.




Gareth.

It's already gone if you have to try "anything". The best way to keep
those decks clean is to not use junk tape. The little brush cannot get
clogged.





I don't understand your claim here.
I have come across many a DAT where one head output is minimal, causing
glitching, but cleaning it restores it back to health.
Its amazing how much black sludge can come off these heads.

And like most things of this nature, "cleaning tapes" or that silly
brush thing just don't work, you have to get in there and do it properly
by hand.


Gareth.
Click to expand...

Those are contacts, not the head gaps. Where is your "black sludge"
coming from?




You are not making a lot of sense.
Both VCR and DAT heads get dirty, black stuff comes off them when you clean
them, then they work properly again.


Gareth.
 
On 09/09/2013 11:10 AM, Gareth Magennis wrote:

Those are contacts, not the head gaps. Where is your "black sludge"
coming from?




You are not making a lot of sense.
Both VCR and DAT heads get dirty, black stuff comes off them when you
clean them, then they work properly again.
Click to expand...

Seriously, the only "stuff" you should see is maybe some shedding from
cheap tape, usually more brown than icky black. Do you have a lot of
smokers around?
 
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