abechap024

Re: PRR 176 vari-mu
« Reply #40 on: June 16, 2011, 02:47:35 AM »
I've built a stereo prototype, using the circuitry devised on the first post. Its a stereo unit and I used ganged pots for input/output and pots for attack/release. hardwired stereo.

I should probably post some samples. But if I was to give my (probably unforgivably biased) impressions of the unit.

The attack and release sounds like an 1176. More color than 1176 though. Its does a great job of adding the tube color we all love tubes for. Makes things just sound better. During initial testing it was noticeable for me on acoustic guitar...Hard to explain, but it just seemed to balance the frequency spectrum. Making it sound bigger and better balanced.

Where you might want to use the GSSL on your mix buss when you have a really drum heavy mix. This seems like something you would use....for everything else!

Anyway Putnam knew what he was doing when he made the 176, PRR knows this stuff up and down and made a gem when he made his vari-mu.
but his always seemed to be intended as just kind of a compressor your could make from the spare parts in your junk box, which I love about it.
This version is trying to take it a step further into a more polished design, by just adding little things (friendly with +4 operation, input/output, regulated 1.5v bias for example) and hopefully in the process I don't mess anything up, or take away from either of the designs.
And  it is sounding great!

I'm going to finalize the front panels designs with dan, and then its off to the Fab house for the PCBs. And because the majority of the design came so selflessly from this forum, I want to keep the goodwill going by offering it as inexpensive as I can.


AC Sound - some DIY circuitboards


strangeandbouncy

Re: PRR 176 vari-mu
« Reply #41 on: June 16, 2011, 02:50:30 AM »
Hi Abe,


   I am very excited to hear of your good results. Waiting with baited breath . . .



     ANdyP
. . . . RUH ROH . . . . .

abechap024

Re: PRR 176 vari-mu
« Reply #42 on: June 16, 2011, 02:55:50 AM »
want to take a peek at the main PCB.... ;D

« Last Edit: June 16, 2011, 03:02:09 AM by abechap024 »
AC Sound - some DIY circuitboards

strangeandbouncy

Re: PRR 176 vari-mu
« Reply #43 on: June 16, 2011, 03:04:20 AM »




 . . . .you teaser . . .
. . . . RUH ROH . . . . .

abechap024

Re: PRR 176 vari-mu
« Reply #44 on: June 16, 2011, 03:05:23 AM »
  :)
AC Sound - some DIY circuitboards

evilcat

Re: PRR 176 vari-mu
« Reply #45 on: June 16, 2011, 03:41:21 AM »
Haha! A Vari-mu compressor with LEDS? That is crazy talk!  :o :o

It sounds so wrong that I honestly kind of like the idea ;D


The TubeTech LCA2b is a vari-mu with LEDs ! But classic Vu meter are so much cooler ;D ;D. Anyway, very interesting project Abe. In fact, all your projects are very, very cool, I'll soon have money issues !!!
Maybe it's too late but, for the bypass feeler, I would go for a "false" bypass to keep the color. If you doesn't want it, then you un-patched it !
To be continued...

Best,
Ben.

mylesgm

Re: PRR 176 vari-mu
« Reply #46 on: June 16, 2011, 04:36:12 AM »
I hate LED vu meters. I think a universal power supply would be better than one that relies on a 110 mains voltage.  It looks like doas are possible for the opamps which I think is an excellent addition.
Check my work at www.mylesmumford.com

abechap024

Re: PRR 176 vari-mu
« Reply #47 on: June 16, 2011, 04:41:47 AM »
Well the power supply doesn't really rely on 117v mains. Just is convenient if you have 117v mains you don't need an extra transformer. I cant think of a way off the top of my head to make a power supply that doesn't use 2 transformers for 220v supplies?
AC Sound - some DIY circuitboards

EEMO1

Re: PRR 176 vari-mu
« Reply #48 on: June 16, 2011, 04:42:06 AM »
 Are you guys sure 1U is a good option?

 I would personally prefer 2U, so there would not be issues with bigger caps, heat, PSU mounting etc etc. 1U can be a pain...

evilcat

Re: PRR 176 vari-mu
« Reply #49 on: June 16, 2011, 08:39:06 AM »
Are you guys sure 1U is a good option?

 I would personally prefer 2U, so there would not be issues with bigger caps, heat, PSU mounting etc etc. 1U can be a pain...

I agree ! My 1st built was in 1U case and tall to myself : "never again" !!! So much pain with metal work to make everything fit in such tiny place. Now it's 2U, at least.


0dbfs

Re: PRR 176 vari-mu
« Reply #50 on: June 16, 2011, 10:38:52 AM »
1U just means that I can get four channels into my allotted 2RU available instead of going without.

-jb
Music is everything!
Audio is everything else!

tomcat

Re: PRR 176 vari-mu
« Reply #51 on: June 16, 2011, 07:17:34 PM »
Haha! A Vari-mu compressor with LEDS? That is crazy talk!  :o :o

It sounds so wrong that I honestly kind of like the idea ;D


Thats why i had this idea. Put old technic into new design and surprise people  ;)
« Last Edit: June 16, 2011, 07:22:21 PM by tomcat »

tomcat

Re: PRR 176 vari-mu
« Reply #52 on: June 16, 2011, 07:20:40 PM »
For the 2HE guys. Maybe abe adds a normal footprint for standing tubes option.

I will go 1 HE ..... with LEDs  ;D

living sounds

Re: PRR 176 vari-mu
« Reply #53 on: July 09, 2011, 07:56:39 AM »
Any news on this?

abechap024

Re: PRR 176 vari-mu
« Reply #54 on: July 09, 2011, 12:43:15 PM »
Yep! PCB design is finished, just got a front panel from Collective Cases to make sure everything is glove like.  I'm hoping to have these sent to the factory very soon.
AC Sound - some DIY circuitboards

living sounds

Re: PRR 176 vari-mu
« Reply #55 on: July 09, 2011, 12:54:18 PM »
Great!  8)

earl

Re: PRR 176 vari-mu
« Reply #56 on: July 10, 2011, 03:24:43 PM »
This looks pretty cool...Definitely in for stereo set
« Last Edit: July 10, 2011, 03:29:17 PM by earl »

dustbro

Re: PRR 176 vari-mu
« Reply #57 on: July 11, 2011, 05:45:57 PM »
Yep! PCB design is finished, just got a front panel from Collective Cases to make sure everything is glove like.  I'm hoping to have these sent to the factory very soon.

 ;D

Re: PRR 176 vari-mu
« Reply #58 on: July 17, 2011, 08:47:17 PM »
Count me in.

earl

Re: PRR 176 vari-mu
« Reply #59 on: July 23, 2011, 10:44:54 AM »
Hey Abe this is certainly getting closer yes? :)


 

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