andow

V672 universal amplifier
« on: October 20, 2018, 02:37:57 PM »
Hey, just wanted to show you my latest build: stereo V672 - racked with lots of bells and whistles.  8)

Can be used as microphone preamp, line amp, DI-box (Bo Hansen), distribution amp (two outputs) and summing amp (with external summing resistors). And I can already tell that this will get a lot of use, these old german modules sound excellent!


andow

Re: V672 universal amplifier
« Reply #1 on: October 20, 2018, 02:39:47 PM »
Innards

andow

Re: V672 universal amplifier
« Reply #2 on: October 20, 2018, 02:40:37 PM »
Controls

[silent:arts]

Re: V672 universal amplifier
« Reply #3 on: October 20, 2018, 03:35:23 PM »
Great looking  and realy universal, good job  8)

andow

Re: V672 universal amplifier
« Reply #4 on: October 20, 2018, 03:41:40 PM »
Great looking  and realy universal, good job  8)

Thanks, really appreciate it!
You might have noticed some ideas are inspired from your designs... ;)

peterc

Re: V672 universal amplifier
« Reply #5 on: October 21, 2018, 02:43:58 AM »
Very nice work!
If opportunity doesn't knock, build a door.

jensenmann

Re: V672 universal amplifier
« Reply #6 on: October 21, 2018, 04:23:54 PM »
Well done, congrats!
Jens
Quote from: PRR
The tubes of course don't care what frequency they distort

electrog

Re: V672 universal amplifier
« Reply #7 on: October 22, 2018, 12:53:24 AM »
Very nice!

I have a pair that I've been wanting to get around to racking for years now.  This is a good inspiration on how to do a clean and functional job - thanks!

saint gillis

Re: V672 universal amplifier
« Reply #8 on: October 22, 2018, 08:28:37 PM »
Great job, how did you print the panel?

andow

Re: V672 universal amplifier
« Reply #9 on: October 23, 2018, 06:00:18 AM »
Great job, how did you print the panel?

Thanks! The case and front-/backpanel are from Frank from frontpanels.de. Highly recommended, btw! This is the best 19" case I ever had...


saint gillis

Re: V672 universal amplifier
« Reply #10 on: October 23, 2018, 06:28:03 AM »
You can send him any design you want? How much did the rack + panels costed you?

dmp

Re: V672 universal amplifier
« Reply #11 on: November 13, 2018, 10:52:37 AM »
Very nice looking. I racked a pair of these a few years ago.
Because they have dual outputs, you can take a pair like this and a a mid-side output. I remember it was very cool.

noisear

Re: V672 universal amplifier
« Reply #12 on: December 04, 2018, 06:18:39 AM »
Pretty nice unit...  I was building a very similar version at the same time : )

Have a look at the pic!

I am using the same Gain-Control.  Two Grayhill rotary switches for the input resistor-pairs and the feedback resistors and also brought the +/- 1,5 dB Trim-Pot to the front. I am not using an additional PAD as the Gain-Range is from 0dB up to 63dB (for sure, you Gain-Range is from -20dB upwards.
I added a bridged T-Pad Attenuator for the Output (also a Grayhill). So, you are able to drive the V672-transformers into nice saturation. Together with the "free-Mode" of the Gain-Control, you have multiple possibilities to shape the Sound.

I also brought the V672-internal Highcut (Air-band, 15kHz) to the front and added a DI-Input plus link. So, you are able to connect your Amp AND record the signal. The LED-Meter is a Neumann MO33 which they are using in their U5072 danner-format meters. The brightness of the LEDs is dimmable.

I am thinking about creating a 2-channel bridged T-Pad, so, that I can also use the second transformer-balanced output as well.
But that means a Grayhill-switch with crazy 38 Resistors on it!

It is very nice to see all these DIY and racking-projects and all the crazy people who are spending so much time on it! Very inspiring, thank you all!
 


noisear

Re: V672 universal amplifier
« Reply #13 on: December 04, 2018, 06:30:00 AM »
Sorry,

the size of the pic was bad to handle...

Hope this is better...

noisear

Re: V672 universal amplifier
« Reply #14 on: December 04, 2018, 06:31:26 AM »
And from inside...

sideman

Re: V672 universal amplifier
« Reply #15 on: December 17, 2018, 08:52:42 PM »
Wow, great job, andow!  :)


 

Related Topics

  Subject / Started by Replies Last post
30 Replies
8476 Views
Last post June 18, 2004, 04:53:58 PM
by Winston O'Boogie
4 Replies
1797 Views
Last post April 23, 2005, 12:19:33 PM
by digichild
0 Replies
1340 Views
Last post December 03, 2005, 06:36:04 PM
by hop.sing
5 Replies
2100 Views
Last post June 21, 2011, 10:40:42 AM
by JohnRoberts