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V3M Schematics?
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V3M Schematics?
 PostPosted: Tue Jan 10, 2012 10:22 pm Reply with quote  
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  Spoons
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I can't find the V3M schematics on www.carvinservice.com/crg/schematic_finder.php

Does anyone know if they have it available yet?
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re: V3M Schematics?
 PostPosted: Tue Jan 10, 2012 10:24 pm Reply with quote  
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  Mr. Scott
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usually you would have to ask but a lot of it is going to be blocked out anyway due to it being new. The whole preamp design is blocked out
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re: V3M Schematics?
 PostPosted: Fri Jan 13, 2012 1:38 pm Reply with quote  
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  Volt
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I understand why no schematic yet. I'd like to see a block-diagram of one, however.
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re: V3M Schematics?
 PostPosted: Thu Feb 23, 2012 6:50 pm Reply with quote  
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  Volt
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Anxiously waiting the schematic to be released.............so i can "fix" the tone of the overdrive channels.........so I will be able to use The V3M as a multi-channel amp........and will no longer need to use my stompboxes for overdrive.
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re: V3M Schematics?
 PostPosted: Tue Mar 27, 2012 5:53 pm Reply with quote  
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  Volt
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I'm in the process of making a schematic of the tone control circuits. Very time-consuming, tedious, and a task prone to mistakes.
The front end circuitry is very similar the the V3 schematic I have, but after that, not very much is agreeing with the V3.
I just started today, but already I see that channel 3 has an unusually small cap for the mid control.
IMO this is a good amp that has the potential to be a great amp!
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re: V3M Schematics?
 PostPosted: Tue Mar 27, 2012 6:15 pm Reply with quote  
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  Spoons
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The only thing I'm wanting to change in the V3M is the amount of drive on the overdrive channels. Right now I'm running mine at 50 watts, with one drive set just above 1, and the other drive is set just above 3.

Personally, I'd like to cut the drive in channel 2 by something close to 3/4 and the channel 1 cut by about half that way I have two "independent" channels with two different drive structures. I don't think I'll eve use the drive set above 5 the way it is set now.
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re: V3M Schematics?
 PostPosted: Wed Mar 28, 2012 7:29 pm Reply with quote  
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  Volt
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So, if I understand you correctly, you use very little overdrive on channels 1 & 2 and would like even less overdrive?

I usually have my channel 2 drive at about 3 or 4 and channel 1 drive at about 6. On the rare occasion that I want mass quantities of OD I add my Boss OD pedal to channel 1's OD. Shocked

The bass, mid, and treble tone controls are fairly straight forward, but the drive controls are rather confusing at the moment. I may have made some errors ciphering them.

NOTE: I can't reveal any schematic details since Carvin hasn't released the schematic yet.

EDIT: After correcting a few errors I made I found that the tone controls are a fairly unusual design.
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Last edited by Volt on Sat Mar 31, 2012 1:34 pm; edited 1 time in total
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re: V3M Schematics?
 PostPosted: Wed Mar 28, 2012 9:32 pm Reply with quote  
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  Mr. Scott
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replace V2 with a 12au7, you will be amazed at the difference. You can even go as far as a 12at7, I would try this first before you start swapping parts on a board.
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Re: re: V3M Schematics?
 PostPosted: Wed Mar 28, 2012 9:35 pm Reply with quote  
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Mr. Scott wrote:
replace V2 with a 12au7, you will be amazed at the difference. You can even go as far as a 12at7, I would try this first before you start swapping parts on a board.

Who was that message for?
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Re: re: V3M Schematics?
 PostPosted: Thu Mar 29, 2012 3:08 pm Reply with quote  
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  Mr. Scott
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Spoons wrote:
Mr. Scott wrote:
replace V2 with a 12au7, you will be amazed at the difference. You can even go as far as a 12at7, I would try this first before you start swapping parts on a board.

Who was that message for?


you, it will lower the gain structure and tighten up the low end some and make it more musical
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Re: re: V3M Schematics?
 PostPosted: Thu Mar 29, 2012 3:32 pm Reply with quote  
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  Spoons
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Mr. Scott wrote:
Spoons wrote:
Mr. Scott wrote:
replace V2 with a 12au7, you will be amazed at the difference. You can even go as far as a 12at7, I would try this first before you start swapping parts on a board.

Who was that message for?


you, it will lower the gain structure and tighten up the low end some and make it more musical

Based on your experience, how much will it reduce the gain structure?

Are the top two tubes on the followinglink what you are talking about?
http://www.jj-electronic.com/index.php?option=com_content&task=view&id=15&Itemid=13
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re: V3M Schematics?
 PostPosted: Thu Mar 29, 2012 9:38 pm Reply with quote  
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  Krasneypoley
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Choosing pre-amp tubes by gain factor-

http://thetubestore.com/gainfactor.html
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re: V3M Schematics?
 PostPosted: Tue Apr 03, 2012 8:09 pm Reply with quote  
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  Spoons
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Ordered (2) JJ 12AT7's today, gonna give this a try.
I'll post a report after I get it done.
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re: V3M Schematics?
 PostPosted: Wed Apr 04, 2012 11:10 am Reply with quote  
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  Volt
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The 12AU7 noticeably reduces channels 1 & 2 gain, and also reduces their fuzziness - good for vintage blues/rock. I increased the drive levels to how much OD I had before the tube swap and the fuzziness returned.
12AT7: The reduction in gain was hardly perceivable.
Of the two tubes I prefer the 12AU7. Your mileage may vary. Smile
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re: V3M Schematics?
 PostPosted: Mon Apr 09, 2012 8:33 am Reply with quote  
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  Spoons
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I haven't even got the new tube to try reducing the gain yet and the V3MC started fading in and out on the gain channel at our warm up rehearsal yesterday morning. The clean channel sounded like it was working properly. This amp only gets used for about 45 minutes to an hour every other week so it's only got about 9-10 hours on it. I certainly hope this is a simple V1 or V2 tube swap issue.

I sent a message out to customer service this morning.

Sad

P.S. It is exactly because of these kind of routine issues with tube amps that I use an Axe-Fx Ultra for my main rig.
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re: V3M Schematics?
 PostPosted: Mon Apr 09, 2012 9:00 pm Reply with quote  
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  Spoons
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Since I had absolutely no replacement tubes to try in the amp, Carvin customer service is sending out (2) 12AX7's to replace V1 & V2, hopefully that'll fix it, I'm guessing it will. I bet the tubes from Carvin get here LONG before the 12AT7's JJ's that are currently back ordered from GC. Since I only use the V3MC as a backup amp and use it every other Sunday morning for our brief warmup rehearsal I'm really in no big rush. I always have a backup switchable SS Roland Cube collecting dust in the closet since the V3MC showed up. I even have multiple backups for my backups, LOL!!
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re: V3M Schematics?
 PostPosted: Wed Apr 18, 2012 7:50 pm Reply with quote  
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The two replacement 12AX7 tubes seems to have fixed the fading problem.
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re: V3M Schematics?
 PostPosted: Wed Apr 25, 2012 9:41 pm Reply with quote  
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  Spoons
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Well after the original factory tubes in V1 and V2 were replaced to fix the fading in and out problem, I was willing to put my new tubes in when they arrived a couple days ago and give them a try.

V1 = JJ 12AT7
V2 = JJ 12AT7
V3 = No Change
V4 = No Change

I think this retubing has done just enough drive reduction to satisfy my taste. I've now switched the Mode switch to "THICK" & switched "ON" the EQX for both channels 1 & 2. Switching the V1 tube to the 12AT7 did little to effect channel 3 the clean channel, I think it might have given me a little more finesse to get a little extra "umph" before it starts to get that touch of of break up - I run the clean channel on BRIGHT. I love the baseline tones across the three channels and with a simple flip of the MODE switch I can take it into hair raising high gain territory or some very sweet sounding blues. About the only thing I'm missing on this amp is to ability to switch it via MIDI.

Overall what I was looking for was more ability of finessing the drive at lower drive levels, this tube switch has solved that for me.
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re: V3M Schematics?
 PostPosted: Thu Oct 10, 2013 2:32 am Reply with quote  
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  RetArmyEng
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I actually stumbled across this thread while looking for V3 Schematics. Specifically I wanted to see what the V3 MIDI circuit looked like.

I would like to mod my V3M with a MIDI circuit so I can use one controller between my amp and Eleven Rack.
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Re: re: V3M Schematics?
 PostPosted: Thu Oct 10, 2013 9:32 am Reply with quote  
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  Spoons
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RetArmyEng wrote:
I actually stumbled across this thread while looking for V3 Schematics. Specifically I wanted to see what the V3 MIDI circuit looked like.

I would like to mod my V3M with a MIDI circuit so I can use one controller between my amp and Eleven Rack.


RetArmyEng,
Thanks for your service.

I'm not too sure you'll be able to modify the V3M in such a way; I'm pretty sure it requires an additional board to be installed and the inside of the V3M is pretty darn cramped as it is right now. You'll probably have to use an external MIDI switcher to accomplish what you want.

P.S. I'd really like the V3M to be MIDI controllable too. As far as I am concerned; in today's technological world, ALL heads that have more than one channel and multiple modes should be MIDI controllable - no exceptions. The ONLY thing preventing this from happening is cost which can be passed directly on to the consumer.
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