Under the hood - inside the Marshall V67G and the Sound

Posted: Fri Jun 08, 2001 3:30 pm

I still haven't had time to do an audio shootout between these two mics, but I thought some of you may be interested in what I found when I took both of them apart and compared them side by side. To disassemble the V67, unscrew the back ring at the bottom of the mic. Next, unscrew the large bottom green ring. You can now slide the green body shell off. There are two small screws holding the gold grille on. When you remove those, the grille will slide off, revealing the capsule.To disassemble the C1, unscrew the 3 screws at the bottom of the mic, and you can slide the body shell off. There are three small screws holding the grille on. When you remove those, the grille will slide off, revealing the capsule.Here's what they both look like inside, side by side:

First impressions:The C1 is definitely has a better built housing and is heavier. The V67G is almost flimsy by comparison. I think I would put something like undercoating on the inside of the green body shell to prevent ringing, although I don't hear any ringing in use. The C1 uses a single circuit board; the V67 uses two back-to-back circuit boards. Either method is fine.The V67 has a transformer, the C1 does not. Good transformers can add a lot of body to the sound and prevent ringing on the high end. Bad transformers can cause severe roll offs and ringing. I know the V67 has a pretty good transformer, so points for the transformer (at least till I can hear the C1 directly compared).Both circuit boards look pretty well assembled. A tie there. On to the capsules:

Wow, this is strange; the V67 capsule is solid brass with teflon spacers and brass rings, while the C1 capsule is aluminium and plastic with teflon rings. Points to the V67G - much more solid construction and engineering. The gold sputter is thicker and more even on the V67 capsule. They didn't sputter out to the edges; the mylar serves as an insulator. The C1 is sputtered lightly all the way out, so that's why they hafta use the teflon rings. Overall, the C1 capsule looks cheesier than the V67 - round goes to Marshall. Let's take a good look at the edge of each mic:

Yup, on the C1, it's teflon spacer, gold-sputtered mylar diaphragm, aluminum back plate, plastic body, clear mylar diaphragm, teflon ring. The V67 has a brass ring, teflon spacer, gold-sputtered mylar diaphragm, brass backplate, brass body, clear mylar diaphragm, teflon spacer, and brass retaining ring. Mega-points to Marshall on capsule construction. Whoa, what's this?

Do you see what just caught my eye? This is the back side of the capsule, You can see the teflon ring, the clear mylar diaphragm, and the plastic body of the C1 on the left. On the right is the V67, where you can see the brass ring, the clear mylar diaphragm, and the brass body of the V67. I didn't see it at first either, so let's get in really close. Here's the back side of the V67 capsule:

Look closely. Now look at the back side of the C1 capsule:

Where the hell are the rest of the retaining screws for the teflon ring? Two screws? The two screws are down so tight, the teflon is partially lifted away from the diaphragm. Those screws are supposed to be there to insure a good back seal and even tension, I believe. All I can think of is the robot in "Lost In Space", waving his arms and crying, "Danger, danger, Will Robinson".Anyway, I reassembled the mics and I'll actually listen to them in the next few days.Damn, while they were open, I forgot to see if the gold top (not the grille itself) is made of plastic or not. Both grilles have the coarse weave outer mesh, and a fine mesh inside the grille. A tie there.I had to go back and open it up and look. No, it's not plastic, the V67G grille is metal.More to come. Stay tuned.

Posted: Fri Jun 08, 2001 8:36 pm

Harvey, just a note of thanks for this thread, this is the kind of info ive been trying to find on these threads. something tangible i see and learn from. your the man!

Posted: Sat Jun 09, 2001 3:44 am

OOOoooh baby!Thanks for pulling the mics apart and showing us the guts, Harvey. That pretty green Marshall mic is just as pretty on the inside. Downright pornographic stuff for a gear slut. Marshall just sold a V67 and I need a cigarette... Surprised

Posted: Sat Jun 09, 2001 5:45 am

<BLOCKQUOTE>quote:<HR>Originally posted by riconga: Harvey, just a note of thanks for this thread, this is the kind of info ive been trying to find on these threads. something tangible i see and learn from. your the man!<HR></BLOCKQUOTE>Agreed 100% Thanks Harvey, very useful and very informative, can't wait to hear the results of the Audio shootout.Simon Smile

Posted: Sat Jun 09, 2001 1:42 pm

<BLOCKQUOTE>quote:<HR>Originally posted by hargerst: The C1 is definitely has a better built housing and is heavier. The V67G is almost flimsy by comparison. I think I would put something like undercoating on the inside of the green body shell to prevent ringing, although I don't hear any ringing in use. <HR></BLOCKQUOTE>Hi, Harvey -Turns out I was already registered here. Must have checked the place out when it was new and forgot about it. I recall some exploratory surgery that Ty performed on a couple of the large Russian mics a while back. He found that some damping material in the case improved them. Maybe "undercoating" the body of the Marshall is a good idea.

Posted: Sat Jun 09, 2001 2:32 pm

Mike, I hope you stick around or drop in often - this place could use a little more class. Smile

Posted: Sun Jun 10, 2001 8:19 am

<BLOCKQUOTE>quote:<HR>Originally posted by hargerst: Mike, I hope you stick around or drop in often - this place could use a little more class. Smile

<HR></BLOCKQUOTE>How come I smell buckwheat pancakes? <bg>

Posted: Sun Jun 10, 2001 9:58 am

Harvey, sorry to be off topic, but did you ever post full reviews of the T.H.E. line? I know you loved the binaural head, apart from the price, but I haven't found more complete commentary here or at r.a.p. and have been wondering. (I like the modular concept for building my home studio micing cabinet.)Bear

Posted: Mon Jun 11, 2001 9:37 am

How timely!The day I bought my V67 and pulled it apart, I noticed the ringy body as well. I attached the fuzzy part of Velcro around the inside. It lightly touches the XLR housing. No more ringiness. Wink

Posted: Tue Jun 12, 2001 5:53 am

Question for Harvey & or Tom Have a V67 due to arrive today. If there is a need line the inside of my mic, Due to ringing. Harvey, What would you suggest as a medium ? Primer, Flat Paint, etc.... Tom, How and where did you place the velcro ? Horizontle. on the bottom, half way up. Vertical strips etc... Thanks, Paul T

Posted: Tue Jun 12, 2001 6:17 am

When the mic is disassembled, the body is basically a steel tube. Towards the bottom of the tube I attached the fuzzy part of Velcro around the inside of the steel tube of the body. If you look at Harvey's photo's you will notice that the XLR housing is a shiny silver, bell shaped housing (with a white serial# sticker on it). When you re-assemble the mic, the Velcro lightly presses against that bell shaped housing. The Velcro mutes the body tube against the XLR housing. If you do this mod, remember that there is a notch where the top mesh assembly locks to the top of the body tube. This keeps the capsule facing the correct side. If these are not matched up when you screw the mic together again, you could damage the mic.

Posted: Tue Jun 12, 2001 6:57 am

I believe the body is actually brass, not steel. Thanks for the tip, Tom. I'm gonna try it.

Posted: Tue Jun 12, 2001 7:54 am

Thanks Tom, Kinda what i figured. Slowwwww day at work today, Just got the mic from officer UPS, Now where are they hideing that velcro? Also thank you Harvey, As i've been following your posts on this very subject from the beginning.

Posted: Wed Jun 13, 2001 10:09 am

My V67G arrived via UPS yesterday and I took it for a spin - it sure sounds nice and smooth on my low baritone voice. A nice contrast to my more "crispy" Rode NT1. Much thanks to you guys with the golden ears and records taking the time to listen to these inexpensive mics and share your experienced opinions with beginners.And a special thank you to the Fearless Leader of the Bottom Feeders for actually prying off the covers and treating us to a guided tour of these two mics. Thank you, Harvey, for being willing to take on us poor students. I know it can be a royal pain dealing with clueless newbies (my day job is computer support) so your patience is greatly appreciated.Tom Cram's velcro anti-ring mod goes in tonight! Very Happy

Posted: Wed Jun 13, 2001 2:07 pm

Harvey,You are the goods. Thanks so much for your time in showing and telling us about these 2 mics. I now have both of them and couldn't be happier. Harvey, Don't ever go away.Mike

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