Scaneltra (Eltra) 1001 tape recorder restoration

[dazzlevision]

Originally Posted by david freeman

I have a copy of 'Tape Recorder' magazine dated Feb 1967 which has a fascinating article about Eltra and the making of the 1001 tape recorder.

Hello David,

I'd love a scan of that article, if you could provide one, please?

Many thanks,

Dazzlevision

[dazzlevision]

Hello,

There are some unusual aspects to the construction of the electronics in this machine.

The screened leads with only one centre conductor (the vast majority) do not have the screen terminated directly. Instead, a small area of the outer sheath is removed and a solid core wire is soldered to the screen. The other end of the solid core wire is terminated. I had to resolder one screen wire and the plastic softened alarmingly, so I am wondering if low melting point solder was used?

There is very little use of sleeving on the individual component leads.

There are several “mid-air” joints, with very fine insulated and stranded wire going from the component junction to tags or valve holder tags.

Considerable use is made of those Philips “pin-up” ceramic capacitors, which have radial leads and are thus better suited to printed circuit board applications.

The majority of resistors appear to be carbon composition types, but the “critical” areas of the circuit use Philips carbon film types (with the beige coloured body).

Luckily, most of the non-ceramic or electrolytic capacitors are of the Philips C296 (“mustard”) type, so they are almost certainly OK (as indeed, are the yellow body colour Mullard plastic film types).

The (Danish made?) audio output transformer is a quality and substantial component.

All in all, the unit exudes "quality" construction, reminiscent of B&O in their valve days.

Regards,

Dazzlevision

[david freeman]

Hi there
I will attempt to scan the article either this evening or tomorrow. I'll need my wife to assist me, as she is more IT literate than I am!

Regards
David

[dazzlevision]

Hello David,

Thank you. Let me know if you are successful and I will send you my email address via a PM.

Many thanks,

Dazzlevision

[david freeman]

Hi there Dazzlevision
Have managed to scan Eltra article! (My wife has!).
If you send me a PM, I will send it to you.

Regards
David

[julie_m]

What kind of microphone was supplied with such a beautiful recorder? Did they use a cheap crystal one, or a dynamic mic with a balun transformer?

[david freeman]

The advert for the Eltra shows it with a 'stick' type microphone on a stand, but there is no mention of it in the specification, or whether it was supplied or just used to complete the picture. Looks rather like the type of microphone supplied with the better Japanese recorders in the 60's and 70's.

[dazzlevision]

Originally Posted by david freeman

If you send me a PM, I will send it to you.

Hello David,

You should have a PM.

Thanks,

Dazzlevision

[dazzlevision]

Originally Posted by ajs_derby

What kind of microphone was supplied with such a beautiful recorder? Did they use a cheap crystal one, or a dynamic mic with a balun transformer?

Hello,

There is a picture of the microphone + accessories + box, with brief spec on inside of the lid here: http://www.dba.dk/spolebaandoptager-...39/billeder/2/

I only have the box and basic mic, the other bits were lost/mislaid by the previous owner.

Regards,

Dazzlevision

[roffe]

Don't know if it is of any help,but:

[tri-comp]

I can't believe reading this... I was examined in this recorder for my final tests at the School of Electronics in 1976. It turned out the erase-head was open.
Also, a fellow tech owned one and as part of our training we took the mechanics completely apart and cleaned, oiled, adjusted all parts to be within factory tolerance. Even Wow & Flutter were within spec's. I remember we had to polish the flywheel to get there.
I do seem to remember that the output-amp was done in two different versions. What shows here using an ECLL800 and I think there was an alternative version using ELL80/6HU8. Possibly as the ECLL800 became scarce.
I did manage to secure a couple of NOS/NIB Lorenz ECLL800's before they all went. They were a bit steep, though. As I remember around $8/ea.

Needless to say all Eltra scholl-papers are long gone. Too bad.

rgds,

/tri-comp

[dazzlevision]

Originally Posted by roffe

Don't know if it is of any help,but:

Hello,

Well, it's a start! Thank you for posting.

Maybe the rest of the schematic will surface at some point.

Regards,

Dave

[dazzlevision]

Originally Posted by tri-comp

Also, a fellow tech owned one and as part of our training we took the mechanics completely apart and cleaned, oiled, adjusted all parts to be within factory tolerance. Even Wow & Flutter were within spec's. I remember we had to polish the flywheel to get there

Hello Tri-comp,

Thanks for posting. Earlier in this thread, another kind member of this forum sent me scans of a (UK) "Tape Recorder Magazine" article from 1967 about a visit to the Eltra factory in Copenhagen and it does mention that Eltra tested every BSR TD10 deck it was supplied with and had to send quite afew back to BSR, as they were not up to specification!

I'm very glad to have opbtained my Scaneltra 1001, it is a very well designed and constructed domestic tape recorder.

Regards,

Dazzlevision

[tri-comp]

Well, something did survive for posterity.
A visit to my parents farm brought forth the original 1964 schematic for the Eltra 1001.
Actually it was taped inside all 1001-taperecorders as was custom at the time.
It's not in a regular A4-format so I'll have to scan and stitch the schematic.
Also, it's the ECLL800 amp-version.
The comprehensive repair and adjustment-manual is lost, however.
I suppose I didn't think I'd ever need it again
I'll find time over the week-end...

rgds,

/tri-comp

[dazzlevision]

Hello,

That is very good news (and my 1001 uses the ECLL800)!

Thank you very much for scanning it. If a better resolution copy could be had by you emailing it to me, let me know and I can send you my email address by PM.

There was no circuit inside my 1001, but it has been "got at" in the past and I suspect whoever opened it up kept the schematic.
Many thanks,

Dazzlevision

[tri-comp]

Here's the lower-resolution scan that fit's the forum.
Quite readable but of course it can be done better.
PM me with your e-mail address for a higher-quality version.

rgds,

/tri-comp


Edit:
If anyone needs translation of the Danish text feel free to ask.

[tri-comp]

Here's the translation on request.

rgds,

/tri-comp

[dazzlevision]

Originally Posted by tri-comp

Here's the translation on request

Thank you very much!

Dazzlevision

[dazzlevision]

Hello,

I think I have figured out the meaning of this section in the schematic:-

Sensitivity at Tape Speed 9,5cm/sec.

Playback Amplifier:
Voltages are shown for Playback of Standard-
Frequency 333Hz on Norm Tape DIN45513; all
Buttons to Minimum. (Makes no sense…?).


The only ac voltage figures shown on the schematic for a 333Hz signal (off a test tape tape during playback) are in the tape playback amplifier, which has no variable controls (e.g. volume and tone); these follow in the power amplifier stage, which is common to the record (monitor) and playback circuits and the ac voltages in the output/power amplifier are all quoted at 1kHz (i.e. with the recorder in record mode).

Regards,

Dazzlevision

[dazzlevision]

Originally Posted by tri-comp

Here's the lower-resolution scan that fit's the forum

Hello,

After studying the schematic (dated 11-64), I think it is for the first version of the Scaneltra 1001, as it doesn't include the motor on-off switching that was provided in the later version of the tape recorder. In all other respects, it seems to be the same (and very helpful).

Regards,

Dazzlevision