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Groove Tubes Brick schematic?
Old 11th February 2009
  #1
Lives for gear
 
retractablezing's Avatar
 
🎧 10 years
Groove Tubes Brick schematic?

anyone have it?

i've tried google extensively, groove tubes' own site, and here..no luck.
Old 11th February 2009
  #2
Lives for gear
 
🎧 15 years
Hope this helps...
Attached Thumbnails
Groove Tubes Brick schematic?-brick-1.jpg  
Old 11th February 2009 | Show parent
  #3
Lives for gear
 
retractablezing's Avatar
 
🎧 10 years
Quote:
Originally Posted by David Kulka ➑️
Hope this helps...
couldn't ask for better, thank you very much David.
Old 12th February 2009 | Show parent
  #4
Lives for gear
 
gyraf's Avatar
 
🎧 15 years
Why is the Anode of the input tube (V1) grounded?

Jakob E.
Old 12th February 2009 | Show parent
  #5
Lives for gear
 
🎧 15 years
Hi
Probably to stop the 'cloners' from making it work!
Matt S
Old 12th February 2009 | Show parent
  #6
Lives for gear
 
🎧 15 years
Hi
Probably to stop the 'cloners' from making it work!
Matt S
Old 13th February 2009 | Show parent
  #7
Lives for gear
 
retractablezing's Avatar
 
🎧 10 years
how so?

folks, any pointers to mods you'd do right off the bat on this circuit (like really obvious stuff) would be greatly appreciated.

i'm in the process of trying to squeeze something more out of mine cause i really don't think it's performing to its full potential, be it in terms of gain but also overall signal quality.
Old 13th February 2009 | Show parent
  #8
Lives for gear
 
retractablezing's Avatar
 
🎧 10 years
i've been discussing this with my tech..sadly he doesn't have the preamp in front of him since he's in denmark...

basically, by looking at the schematic, he says that the 2nd output stage can benefit from taking out a cathode resistor and, if that doesn't make it go into oscillation, that it should give it quite a bit more gain.

i'm very interested in what other folks have to say about potential mods though..

this thing has some of the biggest and heaviest transformers i've ever seen..of course it may mean nothing but makes me hopeful that there's a lot more to be taken out of it than the stock sound.
Old 17th February 2009 | Show parent
  #9
Lives for gear
 
2 Reviews written
🎧 15 years
I wonder how this applies to the DITTO.

Edwin
Old 17th February 2009 | Show parent
  #10
Lives for gear
 
🎧 15 years
Hi
With valves it is usually a trade off between 'quality' and gain.
Use of feedback generally improves quality but gain is in short supply in many pieces of valve gear.
Guitar amps have as little feedback as possible which gives best use of valves but the non linearity gives a 'distorted (coloured) sound. In a guitar amp this is usually desirable, as a mic amp, some' gives 'colour' but too much is not necessarily a good thing (depends what you are after).
Matt S
Old 8th December 2011
  #11
Lives for gear
 
Oldone's Avatar
 
🎧 15 years
Any suggestions on taking the hi end peak out of the sound? I love the low end, nice defined but that high end snappy peak needs some taming.
Old 14th December 2011
  #12
Here for the gear
 
🎧 15 years
I like the grounded plate on the input tube.
I wonder if they also have a schematic that works?
BTW, what is the input tube? I can't read the # in the print.

Peace,
DrRick
Old 23rd August 2014
  #13
Here for the gear
 
🎧 10 years
Why is the Anode of the input tube (V1) grounded? Jakob E.

you are not reading the scheme properly, it not.
Old 23rd August 2014
  #14
Gear Maniac
 
🎧 5 years
The attachement is too low res to be clear all the way.
I think that the V1 should be a cascode for the input FET, everything else makes no sense.
Perhaps the anode is used to feed the screening of the cable in order to reduce the capacative loss in the cable?

No idea, I didn't do any research on whatever the brick might be.
Attached Files
File Type: pdf TubeDI.pdf (20.4 KB, 541 views)
Old 23rd August 2014
  #15
Lives for gear
 
🎧 15 years
Hi
Before the days of CAD the schematic and actual production drawings did not 'have' to tie up so the person making the unit could simply ignore 'typos' (the drawing equivalent of typing?) and just build it correctly.
Poor standards of drawing technique make this worse of course.
Matt S
Old 25th August 2014
  #16
Lives for gear
 
gyraf's Avatar
 
🎧 15 years
Naa, V1 plate actually IS grounded. 100V Zener from plate towards V+, +103V penciled in there.

G2 has +82V, they're probably using this as plate (wonder why?)

better schematic attached, .pdf

Jakob E.
Attached Files
File Type: pdf GrooveTubes - The Brick.pdf (770.8 KB, 1273 views)
Old 25th August 2014
  #17
Lives for gear
 
gyraf's Avatar
 
🎧 15 years
And an inside pic. Spot the funny error... :-)

Jakob E.
Attached Thumbnails
Groove Tubes Brick schematic?-brick_inside_funny.jpg  

Last edited by gyraf; 25th August 2014 at 01:36 PM.. Reason: sp
Old 25th August 2014
  #18
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