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Old 21st October 2008, 02:03 AM   #1
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Default Telefunken V69B - Tube Amp

Hi all ,

By now , I’m starting a new job :
To restore and to repair a pair of the very beatiful
cinema tube amplifier Telefunken model V69B .

The output tubes are 2 x “ F2a11” , the
voltage amplifier : EF 804 , etc .

My question ( ... and the big problem ) is :

Does anyone have the schematic or any
useful document of it ??

Any reply will be very helpful and wellcome. Thanks in advance

Carlos
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Old 21st October 2008, 04:29 AM   #2
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Hi Carlos,

Click here for V69b. Predecessor V69a here, and w/o suffix here.

Besides schematics, all archives include additional sheets with data, etc.

Regards,

Tom Schlangen
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Old 25th October 2008, 01:45 AM   #3
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Hi TOM ,

I apologize for my delayed reply.

Thank you very much for the tip , very useful .

Best Regards ,

Carlos Eduardo
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Old 26th October 2008, 03:43 AM   #4
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Default Telefunken tube preamp

Hi TOM ,

Do you have any information (schematics , documents , etc. )
about the Telefunken tube preamp model V 86 ??

Thanks again , about the V69 A & B schematics and documents
they are great and extremely useful !!

Best Regards ,

Carlos Eduardo
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Old 26th October 2008, 08:39 AM   #5
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Default Re: Telefunken tube preamp

Hi Carlos,

Quote:
Do you have any information (schematics , documents , etc. ) about the Telefunken tube preamp model V 86 ??
As far as I know V86 modules were used in big studio tape recording machines to give amplification (and maybe also pre-equalization) for the write heads. Likewise, V87 modules were used for the playback heads.

Further information on V86 and V87 modules is quite rare. My best bet would be to search the Web quite specifically for sites which cover big studio tape machines - there are some sites which even offer a dedicated forum for such stuff. Chances are you may get in contact with someone who has the details. Maybe a link worth following in this regard is here (Forum using German language).

As far as I know the Telefunken professional tape recording division was sold to Studer somewhen, who continued servicing and maintenance for Telefunken. So, looking for V86 in context with Studer also might give hints worth following.

Regards,

Tom Schlangen
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Old 29th October 2008, 01:36 AM   #6
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Hi TOM ,

Thanks again , for your kind attention , and for your
reply . I’ll try that !!

OFF TOPIC : Congratulations for the cats , they look
gorgeous . I like cats too ( ... and dogs , and birds ),
and have two females : #1 “Cleopatra” ( like the
egyptian queen ) and # 2 “Bianca” ( because it is
entirely white ) , both , very friendly .

Best Regards ,

Carlos Eduardo
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Old 19th December 2008, 01:23 AM   #7
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Hi TOM ,

Here am I again , only to say that the restoration job
of the two units of V69b – Telefunken tube amplifier
is complete .

My client ( a very nice person with good relations and
a lot of money ) could get through e-bay , from ( the
former ) E. Germany area , two nice pairs ( brand new
into the original box ) of SIEMENS F2a11 ( 140,00 euro
each !!! ), and four pcs of EF804S ( Telefunken ) .

At the end , I would like to say that , the V69b has
a really nice , clear , smooth and beatiful sound .
It is a pleasure to listen them , hour after hour , endless .
An excelent job from the German engineering , and
very simple after all .

The only issue , is that the input impedance is low
( if you are using the input level control ) , about 5 K ohms
then , you need a preamp with an output impedance
around 500 ohms or lower if you do not want to lose
any detail .

About the V86 preamp’s , you wrote :

"As far as I know V86 modules were used in big studio tape recording machines to give amplification (and maybe also pre-equalization) for the write heads. Likewise, V87 modules were used for the playback heads.

Further information on V86 and V87 modules is quite rare. My best bet would be to search the Web quite specifically for sites which cover big studio tape machines"

You was CORRECT , but I could not get any information
about them , despite all my efforts , and all the research .

Did you have the opportunity to listen them ??? ( The V69b , of course )

Best Regards ,

Carlos Eduardo
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Old 19th December 2008, 03:11 PM   #8
RE 604 is offline RE 604  Germany
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Hello Carlos ,
I am also a V69 fan , I have also a pair in my Telefunken O85 studio monitors .
For the circuits of V86 and 87 send me an e-mail , I have both circuit diagrams and also a diagram to convert the V87 in a RIAA preamp .
E-Mail adress is on my homepage

www.ak-tubes.de

Regards , Alexander .

The picture from my O85 is from ETF 2006 .

Click the image to open in full size.
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Old 22nd December 2008, 01:25 AM   #9
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Hi Alexander ,

Very good to hear from you .

I restored and repaired a pair of V69 B , thanks to the tip that I had
received from Tom . If I can choose one word to define its
performance , the word is : “ AMAZING “
The sound is natural , the quality is maximum , in two words :
“ VERY SWEET “

I tried to keep up all essential characteristics , and only replaced
electrolytic caps and resistors of output tubes cathodes , the bias filter ,
replaced the bias bridge rectifier with a discrete bridge ( only for safety )
( 4 x 1N4007 Philips ) , replaced the voltage doubler’s SS devices
by ultra-fast/soft-recovery silicon diodes , replaced the feedback resistors
( 110 K ) by wirewound resistors , the input wiring , screen grid resistors
by metal-film ones and others minor changes .

The hard job was to disassemble , to clean and to assemble the push-
buttons on the front panel , used to read the cathode current .

But all the sweet sound came out , when I replaced the coupling capacitors ,
by polypropilene units : EPCOS 47 nf x 1600 V , a German cap
to keep the “ royal blood “ , of course .

Yesterday I delivered the “ job “ to my client , that came into my laboratory
at 9:00 PM and only quit at 3:00 AM , really a long session of listening ,
when the V69b showed all of its superiority .

By the way , one month ago I had finished , a total and complete restoration
( perhaps the correct word is reconstruction ) of two cinema tube amps,
made by Carl Zeiss , in the former E. Germany , between 1949 and 1953 ,
using 2 x EL12 as output tubes and 3 x EF86 as voltage amplifier and phase
inverter ( connected as a triode ) . I need to be honest and say that between
the Telefunken and Carl Zeiss , the fight was very hard , because each one
has its own personality , but all of two are very , very sweet and clear .
Obviously , in the case of Carl Zeiss , I think that the good quality did come
from the well designed EL 12 output tubes , and in the case of Telefunken ,
the good quality came from an entire design and construction .
To say : the entire design , the circuit topology , the output transformer and
the F2a11 output tubes , for shure .

I will send an e-mail to you . Thank you very much , for your kind reply ,
and congratulations for your sound system .

Best Regards ,

Carlos Eduardo
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Old 1st January 2009, 04:20 PM   #10
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Default No reply !!

Hi Alex ,

I've sent e-mails to you , but I
could not get any reply .

Is the adress wrong ?? Is there another
adress ??

Please , I need your help about the V86
and V87 schematics .

Happy new year !!

Regards ,

Carlos Eduardo
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