G7 microphone finally finished!!! (now with a short clip!)

[Jonkan]

Heres my G7 mic that i finally finished. The sound is amazing. Thanks to Jakob for sharing his schematic and pcb layout.

Im using Dales M7 clone, and a beyer 1:7 transformer in reverse on the output.

I also modified the psu voltage divider to get around 60V to the back of the capsule. On the front i get around 62v with the unmodified circuit. That was the closest i could get, but i figure it is close enough for rock'n'roll, right?
Other than that nothing out of the ordinary about it.

The biggest problem with it is that the mic looks so much better than the psu, which i made from a really beat up old hammond box that I bought for almost nothing. You cant really tell that from the pic though.

I also really need to thank Hasse for making the capsulemount for the m7 clone, giving me the copper tube, and the bottom plate, and some tools...Basically he almost built it. And Thanks to Happytom for giving me the brass mesh. Thanks guys!

Now i just need to find a suitable shockmount and case for it. Any ideas?

/J

 

[OscarVein]

Nice work. :thumb:
I had my Peluso CEK-12 capsules today and talked with a local technic high school (dunno the word) to make me the bodies.
I don't have the tools nor the confidence to do this by myself.
One question for you and as well for others who have made the G7.

How did you mount the XLR into the base? Just the panel mounted model screwed straight to the bottom or stripped it down and fitted it into the bottom?
If someone has a picture of their G7s bottom plate, I would really like to see one.

You cannot see this from the pictures and I couldn't find any mention of this anywhere...

Oh', by the way, this is my first post here. So, hello to all!!

 

[gyraf]

How did you mount the XLR into the base? Just the panel mounted model screwed straight to the bottom or stripped it down and fitted it into the bottom?

From the /DIY /G7 page at Gyraf:

Jakob E.

 

[OscarVein]

From the /DIY /G7 page at Gyraf:

Sorry, momentary blindness struck me. I've been thru that page dozens of times.

But how about other ways?

 

[Jonkan]

Thats pretty much how i did it aswell. Maybe not the most beautiful solution, but when it sounds that good, who cares.... :green:

/J

 

[HappyTom]

:thumb:

HT

 

[beatpoet]

[quote author="Jonkan"]

[/quote]

Nice banana :thumb:

 

[Jonkan]

Did i mention that its a tube banana. Sounds way better than a regular banana.

The shiny big thing on the left is just a decoy... :green:

/J

 

[Lowfreq]

Tube banana? Make sure it's a NOS one................. not one of those cheap crappy bananas coming outta china

 

[MartyMart]

Great work - looks superb, including the hammond box !!
Marty :grin:

 

[bluezplaya]

Heres my G7 mic that i finally finished. The sound is amazing.

Can you describe the sound?

 

[Jonkan]

Hard question, and I must say that i havent used it enough to make a really educated statement, but here are my first impressions. The sound of this microphone is:

Smooth and thick. Dark, but not too dark. Midrange is really, really sweet and not fuzzy in the upper midrange like cheap microphones. Perhaps a bit shy in the bass and not very much proximity effect, but didnt dale say that that is normal for the m7 capsule design?

/J

 

[ioaudio]

nice mic - i dig the housing!
g7´s being bass-shy - try a mic preamp with a higher input impedance.

-max

 

[craigmorris74]

Possibly stupid question, but could some of the bass shyness by the transformer?

 

[jensenmann]

[quote author="ioaudio"]nice mic - i dig the housing!
g7´s being bass-shy - try a mic preamp with a higher input impedance.

-max[/quote]

old Neumann tube circuits do like to see 2k (said without looking at the G7 circuit)

 

[Jonkan]

I have a 1:7 beyer trafo on the output...Not sure what impedances that would translate to.

/J

 

[craigmorris74]

I admit that I haven't experienced it myself, but have hear the Beyer transformers roll off the low end a bit. I apologize in advance for posting hearsay.

craig

 

[Benny]

I've got the same bass shy sound with my G7 (Lundahl output).
The microphone sounds very clear and seems to pick up even the softest whisper but as described before it seems pretty bass shy. I tested it with three different 312, two greenpres and tascam preamps. The sound is mostly the same on all of these preamps. But I would prefer a little more fatness in the sound.

 

[imo]

I find a ton of low end in mine, lundahl tran, Dale M7 capsule. Actually quite a bit more head to head than my friends Lawson L47. What did you use for a capsule? Are your voltages pretty close?
Ian

 

[MrZpliff]

[quote author="imo"]I find a ton of low end in mine, lundahl tran, Dale M7 capsule. Actually quite a bit more head to head than my friends Lawson L47. What did you use for a capsule? Are your voltages pretty close?
Ian[/quote]

Ian: Have you modified your polarization voltages ? I know Jonkan has modified it to about 0-60-120V instead of 0-80-160V and I plan to do the same, but maybe I should try just the way it is first. (I'm using Dales M7 capsule)