help identify console strips (Decca?)

[diggy fresh]

Hi guys, a friend has these strips, haven't seen them in real life yet but he says they're Decca.

Anybody knows anything? The model?

If i could locate documents and schematic that would awesome but they look rare based on me not finding any matching pics on google.

thanks

 

[mjrippe]

I have not handled a lot of Decca gear, but they did use some funky knobs. Pics of the PCB would be more enlightening.

 

[musika]

I've never heard of them before, but this forum conversation may give some clues to "Decca" consoles from the past:

Gearspace

 

[pucho812]

Saw this on facebook this morning. any clues as to why they think they are decca?
perhaps more photos are in order.

 

[AlvaroAlba]

They belong to a late 60’s or early to mid 70’s Decca germanium based Mastering console.

 

[gyraf]

They belong to a late 60’s or early to mid 70’s Decca germanium based Mastering console.

Alvaro - why do you think so?

(also: you're not a bot, are you?)

 

[AlvaroAlba]

Hello ….no no bot here….just a curious musician and vintage gear collector…yes the console is definetly 60,s .,, 1966 according to my data…solid state germanium desk…not sure if “mastering“or just “mixing“ desk ….

here is the reasoning….will attach pics. from two Decca desk from 1960,s .…..there is a “green” one and a “beige” one ….diferent sizes but basically the same desk

there is another pic of a pair of those green channels….
there is also a pic from the inside …you can even see the Decca micpreamp card….with “Beyer” transformer.

finally there is another pic. of the Decca mic preamp card I recently bought …..it’s exactly the same micpreammp card that is on the channel strip from the green Decca console.,

the guy who sold me the Decca preamp card showed me the same pic from this Post …meaning the beige with blue knobs channel strips in the pic that we are helping to identify….this pic. I will repost at the end.

the seller also told me those beige channel strips belonged to a Decca “mix” console it was made for CBC in 1966

so I have a Decca mic preamp card from the BEIGE with Blue knobs 1960,s Decca desk

this card is exactly the same as the ones inside the more common “Green” Decca console 1960’s console….

Hope I was clear …English is not my first language…

Thanks..

 

[analogguru]

Now lets have a look:

Only because a transistor has a metal can doesn't mean that it is a germanium transistor. The transistors shown in the pictures appear to be SILICON transistors of the BC109/BC179-family.

Looking at the resistors they apeear to be carbon-film resistors which were uncommon in the early to mid 60's.

Looking at the electrolytic capacitors the preamp-card from AlvaroAlba it looks like this is older than that from the older picture. On AlvaroAlba's mic-preamp 50µF capacitors can be found. The transistion to the now in use value of 47µF was approx. 1970.

So I would date this stuff to the late 60's, maybe early 70's.

When I look at the component arrangement an the beyer transformer, two circuits come to my mind:
The Sennheiser M101 location mixer (which uses Beyer transformers too) and the WSW-Siemens mixer from that time where the schematics can be found on www.wsw.cz.

So if anybody of the owners would take at least a picture of the track/solder side of the pcb and maybe some additional pictures of the component side and values, a schematic could be traced.

 

[AlvaroAlba]

That’s great…thanks for all the input….sure I will take some pics. And will upload them here…

 

[AlvaroAlba]

Here are some pics from both Decca micpremp/line cards….hope you guys find them useful…..