I wonder if there are any professional audio multi-track recorders that
match the tape width, number of tracks and tack pitch and have the
necessary frequency response.
On 2/7/2022 3:05 PM, Marc Howard via cctech wrote:
8 track tapes use 1/4" wide tape. Most 8 track
units use heads with only
two tracks implemented. There was a stepper solenoid that moved the head
down (or up after all 4 stereo programs were played). Growing up in the
60s you never forget things like listening to In-A-Gadda-Da_Vida fade in
the middle of the drum solo and a loud "klunk-klunk" sound and the song
Some true 8 track heads were made for mastering pre-recorded tapes and
maybe for consumer recorders.
On Mon, Feb 7, 2022 at 12:51 PM Michael Thompson via cctech <
cctech at classiccmp.org> wrote:
> DECtapes have 5x redundant tracks. If you could find an 8-track head that
> had the same track pitch, and maybe track width, you could read the tape
> but lose redundancy on the Mark and Timing tracks. That probably would not
> work with a marginal DECtape.
> On Mon, Feb 7, 2022 at 3:33 PM Wayne S <wayne.sudol at hotmail.com> wrote:
>> I?ve often wondered if the tape heads from consumer tape devices such as
>> cassette or 4-8 track tape players could be used or be made to be used as
>> replacements. Anybody ever try that?
>> Sent from my iPhone
>>> On Feb 7, 2022, at 11:51, Michael Thompson via cctech <
>> cctech at classiccmp.org> wrote:
>>>> From: Gary Oliver <go at aerodesic.com>
>>>> Subject: DECTape head problem
>>>> In debugging my DECtape interface lashup, I found that one of my head
>>>> has two open windings.? Specifically, one channel has an open
>>>> with the other two lines apparently the full winding of the channel.?
>>>> The second channel failing has no continuity between any of the three
>>>> lines.? I have tested the other head and it has all the requisite
>>>> continuity so I'm hoping I can at least get a single spindle
>>>> Has any ever attempted repair of one of these?
>>> At the Rhode Island Computer Museum we found several DECtape heads on
>>> and TU56 drives with open connections. A volunteer got one head X-Rayed
>>> we could see the solder joints between the tiny wires for the head
>>> and the larger twinax wires that go to the relay board. We couldn't see
>>> damage to the wires or solder joints.
>>> We tried heating the potting material to soften it, and digging it out
>>> get to the solder joints. While digging at the potting material you
>>> see the tiny wires, so they will likely get damaged.
>>> We considered using a solvent to remove the potting material, but
>>> that it would eat the enamel off the head coil wires and damage them
>>> So far we haven't found a way to repair the heads.
>>> Michael Thompson
> Michael Thompson