Scaneltra (Eltra) 1001 tape recorder restoration

[tri-comp]

I'll buy your explanation regarding the 'no-sense' paragraph.
OK, so I put some effort into getting hold of another schematic ..and I did!
This one is dated 3-65 and is therefore a later version.
The ONLY difference between the published schematic and this newer one is a short statement, that in case of using the Peerless variant speaker delete parts C57 & R75.
They form part of the Loudness circuit around the Volume-pot R47.

Ah, and another difference.
In your schematic upper left corner is shown Roman # I
The newer schematic shows Roman # II

I'll scan & post if you like.

rgds,

/tri-comp

[dazzlevision]

Hello tri-comp,

I'm glad you agree with my explanation of the 333Hz issue!

Many thanks for searching out a later schematic. I have made a note of the variations in "issue II", dated 3-65. I don't think there's any need to scan and post the later version here.

However, should you come across a later schematic, or even a full service manual ......

Many thanks for your efforts.

Regards,

Dazzlevision

[dazzlevision]

Hello,

You know what they say about waiting for a bus; "you wait for ages and then two come along together"? Well, I picked up another Scaneltra 1001 at the NVCF last Sunday, for a very reasonable price.

It is an earlier version, without the three position tape transport control (pause, spool brakes off and motor off - an Eltra modification to the standard BSR TD10 tape deck) next to the main "joystick" but it is in much better cosmetic condition and it came with issue II of the schematic diagram!

I hope to make a very good machine from the two. I'll report progress in due course.

Regards,

Dazzlevision

[mcs_5__]

Originally Posted by leakstereo20

Telefunken ECC808 is "just" a superfine longlife ECC88.

Just in case somebody else reads this - the above is not the case. The ECC808 is a low-noise ECC83, and has nothing to do with the ECC88. The ECC808 was made by the Philips factories also. If you cannot find an ECC808, you can rewire the socket and use a (good) ECC83.

I also have an Eltra 1001, but the heads are bad.

Best regards,

Mikkel

[DOFFERY]

Mikkel,
Do you have the data for the head/s as I have many old mono heads, miniflux etc. One I have is 500 ohms. 900 mhs., similar physical size.

Colin.

[mcs_5__]

I have no data for the heads. I guess they are the standard heads installed on the deck by BSR?

My Eltra came from my school, and was well (ab)used. The heads have deep tracks carved into them. When I started school in the early 80's the Eltras were still used!

Best regards,

Mikkel

[vidjoman]

Where I worked in the 60's we sold a lot of these. We had close ties with Colin Hammond as we also sold loads of Revox as well. They sounded very good for a lower cost machine.

[dazzlevision]

Originally Posted by mcs_5__

I have no data for the heads. I guess they are the standard heads installed on the deck by BSR?

Hello,

On both of my Eltras, the heads have "BSR" stickers on them, but no obvious type number markings.

Regards,

Dazzlevision

[DOFFERY]

Check the resistance for a start, other data if tester to hand BSR had more than one type of head.

Colin.

[julie_m]

..... But only use a digital meter when measuring tape heads, unless you want your tapes to get almost imperceptibly quieter every time you listen to them!

[vidjoman]

Or you've got a tape head demagnetizer.

[Welsh Anorak]

Hi
But never use an analogue meter on Bogen heads as they will very often decide to get very much quieter after - i.e. open circuit!
Glyn

[ricard]

Are they really that sensitive? I remember hearing that moving-coil turntable pickups should not be measured with an ohmmeter because the current will fry the windings. But I've never heard of tape heads being that sensitive. Perhaps Bogen used an unusually thin wire for the windings? Maybe the reason Bogen heads go open circuit after a while is due to current spikes from machine (especially when switching between play and record) stressing the windings?

[julie_m]

A recording or double-duty head has to handle a hefty current in operation; and an erase head, even more so. So it's unlikely to be cooked by a brief DC resistance test, especially given that a 1 kΩ / V meter would only put out a test current of 1 mA. A dedicated playback head would not, in theory, need to withstand bias current and could be constructed more fragile; but you surely want that head to be as similar as possible to the head that actually laid down the signal, for the most faithful reproduction?

Still, I wouldn't write it off as a mere myth; after all, anything that isn't actually impossible is possible, by definition.

I think "Don't use an AVO 7 on a tape head for fear of causing damage" must have got misinterpreted by someone to mean there was a risk of actually burning out the windings as opposed to magnetising the head, and stuck -- especially if there are some particularly fragile and expensive tape heads out there.

[DOFFERY]

Bogen heads are/were notorious for going O/C , in the past when I have had a faulty head on one winding I have used a normal Ohmeter on the "good " track, result O/C ,this was to prove a point.

Always be very careful with any heads but Bogen!!!!!!!!!

Colin.

[ricard]

Any chance of scanning that article? Sounds interesting!

[DOFFERY]

A typical BSR R/P head would be 450 ohms, 600 mh aprox. If this is as per Eltra at least you know what to look for.

Colin.

[DOFFERY]

Dazzlevision,
Hope you don't mind a clarification to avoid confusion ,in your post re. the Eltra article in "The Tape Recorder" magazine, it was the "Tape recorder" as distinct from the "Tape Recorder" magazine. No offence meant.

Colin.