Telefunken V672/2 racking

[bram9206]

Here's a photo report of a pair of Telefunken V672/2 line amps that I racked up last week.
Thanks to Matt at Vintage City for designing the six step gain switch, the -20dB pad and the phase reverse switch.
And thanks to Frank at NRG for making the front panel.

First I drew a nice layout for the front panel, did some serious measuring and sent a scan of my drawing to Frank, who then made the front panel for me.

Two weeks later I got it. A nice 1U engraved front panel with white infils and a so-called "Neve-like RAL5008 colour", in a powder coated finish. Knobs are replica Stockli knobs.

Now one of the things I wanted to do was to bring the 1,5dB pot meter to the front panel.

Then I attached the preamps to the bottom of the enclosure with two selfmade alluminium braces cut to size.

Attaching all the controls.

Wiring the whole thing.

I really wanted a seperate control to adjust the output level so that I could drive the gain stage a little more and thus, in combination with the 1,5dB pot meter, find that real sweetspot that makes these, and so many other, preamps so lovely to work with.
Now, to make this desirable feature I used a Bourns T-pad attenuator from Hairball Audio.

The six step gain switch, as well as the phase reverse and the -20dB pad were designed by Matt at Vintage City.

So here it is. Still working on the 24V PSU as I really wanted one seperate PSU that can drive at least four or six units.

And a final picture with his big brother, one of the two Pultec clones I did two years ago. Here's the thread if you like:
http://groupdiy.com/index.php?topic=54468.0

Let me know if you have any questions. I'd be happy to help you out.

 

[rock soderstrom]

Good work!

 

[mjrippe]

Just curious - since you have ~5dB/step input and a variable output, why worry about the 1.5dB trim control?  Does it really make a difference?

 

[bram9206]

Well, when it really comes to finding that sweetspot, a 1.5dB trimmer helps a lot. A 5dB step is in that case too big a step. I just noticed the new Chandler Limited TG2 500 series also provides a "fine gain" for tuning right into that sweetspot. You only need it of course when you really want to hear the colour and character of the preamp...

 

[opacheco]

Dear bram9206,

Which one Bourns T-pad attenuator from Hairball Audio did you used for the output control??....Do you have a link for??

Thanks,
Opacheco

Here's a photo report of a pair of Telefunken V672/2 line amps that I racked up last week.
Thanks to Matt at Vintage City for designing the six step gain switch, the -20dB pad and the phase reverse switch.
And thanks to Frank at NRG for making the front panel.

First I drew a nice layout for the front panel, did some serious measuring and sent a scan of my drawing to Frank, who then made the front panel for me.

Two weeks later I got it. A nice 1U engraved front panel with white infils and a so-called "Neve-like RAL5008 colour", in a powder coated finish. Knobs are replica Stockli knobs.

Now one of the things I wanted to do was to bring the 1,5dB pot meter to the front panel.

Then I attached the preamps to the bottom of the enclosure with two selfmade alluminium braces cut to size.

Attaching all the controls.

Wiring the whole thing.

I really wanted a seperate control to adjust the output level so that I could drive the gain stage a little more and thus, in combination with the 1,5dB pot meter, find that real sweetspot that makes these, and so many other, preamps so lovely to work with.
Now, to make this desirable feature I used a Bourns T-pad attenuator from Hairball Audio.

The six step gain switch, as well as the phase reverse and the -20dB pad were designed by Matt at Vintage City.

So here it is. Still working on the 24V PSU as I really wanted one seperate PSU that can drive at least four or six units.

And a final picture with his big brother, one of the two Pultec clones I did two years ago. Here's the thread if you like:
http://groupdiy.com/index.php?topic=54468.0

Let me know if you have any questions. I'd be happy to help you out.

 

[escondite]

Here's a photo report of a pair of Telefunken V672/2 line amps that I racked up last week.
Thanks to Matt at Vintage City for designing the six step gain switch, the -20dB pad and the phase reverse switch.
And thanks to Frank at NRG for making the front panel.

First I drew a nice layout for the front panel, did some serious measuring and sent a scan of my drawing to Frank, who then made the front panel for me.

Two weeks later I got it. A nice 1U engraved front panel with white infils and a so-called "Neve-like RAL5008 colour", in a powder coated finish. Knobs are replica Stockli knobs.

Now one of the things I wanted to do was to bring the 1,5dB pot meter to the front panel.

Then I attached the preamps to the bottom of the enclosure with two selfmade alluminium braces cut to size.

Attaching all the controls.

Wiring the whole thing.

I really wanted a seperate control to adjust the output level so that I could drive the gain stage a little more and thus, in combination with the 1,5dB pot meter, find that real sweetspot that makes these, and so many other, preamps so lovely to work with.
Now, to make this desirable feature I used a Bourns T-pad attenuator from Hairball Audio.

The six step gain switch, as well as the phase reverse and the -20dB pad were designed by Matt at Vintage City.

So here it is. Still working on the 24V PSU as I really wanted one seperate PSU that can drive at least four or six units.

And a final picture with his big brother, one of the two Pultec clones I did two years ago. Here's the thread if you like:
Finished Pultec EQP-1A clone with Cayocosta layout

Let me know if you have any questions. I'd be happy to help you out.

Hi!

I've a 2 672 telefunken, would you do me the racking service ???

Best!!!!