D-EF47 Tribute To Oliver Archut U47 Build Thread.

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innercityman

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So I finally got to try the heiserman hk47. Wow…wonderful capsule. Although not an exact Neumann clone it has that neumanesque 3D image that I don’t hear in other k47 clones. A little more tamed in the mids but beautiful sounding and smooth with a very nice but not shrill presence.
i need to do further testing but I believe that the synergy of hk47 and ef800 can bring you a lot closer to the k47/vf14 combo than k47 and ef800. I have a feeling that ef800 doesn’t have the sparkle of the vf14 so the hk47 with the touch of extra air works better.
I would have been surprise that a 350$ capsule didn't give you this kind of U47 magic... Definitely not for everyone's budget
 

Purplenoise

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I would have been surprise that a 350$ capsule didn't give you this kind of U47 magic... Definitely not for everyone's budget
For sure but…compared to the Neumanns $900 price tag I think it’s a really good price for what you get. Most quality capsules are priced similarly though ( thiersch, beesneez, Tim Campbell etc). I’d rather build a mic with $1000 in parts than buy a mic for a $1000 with $200 worth of parts. That’s how I think of it…given that I build it right of course hahaha
 

Purplenoise

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Exactly! Little tyke wants his money's worth!
Haha…doesn’t everyone. The truth of the matter is that the less resources you have the more ingenious and knowledgeable you become to overcome the limitations. I have seen people come up with amazing sounding stuff using very affordable parts. Unfortunately I am nowhere close to that so…better parts and proven designs help me sleep better at night haha
 

negaikast

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So I finally got to try the heiserman hk47. Wow…wonderful capsule. Although not an exact Neumann clone it has that neumanesque 3D image that I don’t hear in other k47 clones. A little more tamed in the mids but beautiful sounding and smooth with a very nice but not shrill presence.
i need to do further testing but I believe that the synergy of hk47 and ef800 can bring you a lot closer to the k47/vf14 combo than k47 and ef800. I have a feeling that ef800 doesn’t have the sparkle of the vf14 so the hk47 with the touch of extra air works better.
Purple,

I ALMOST pulled the trigger on a 3U M7 and was reading through and listening to samples just one more time. Had HK47 also in mind but is twice the I can’t get the D7 currently.

How would you describe the differences between the D7 and the HK47?

I’m trying to replace the stock capsule on my Miktek CV4. Sounds really good but with the high shrill, just doesn’t have that “magic”.

Jake
 

Purplenoise

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Purple,

I ALMOST pulled the trigger on a 3U M7 and was reading through and listening to samples just one more time. Had HK47 also in mind but is twice the I can’t get the D7 currently.

How would you describe the differences between the D7 and the HK47?

I’m trying to replace the stock capsule on my Miktek CV4. Sounds really good but with the high shrill, just doesn’t have that “magic”.

Jake
Hey Jake, they are different. Hk47 is more detailed with great depth and high end extension. Not an exact k47 but definitely captures the vibe and works great with ef800 tubes. Actually I like it more to a Neumann k47 when paired with an ef800.
The D7 and 3u M7 are similar. Very creamy and smoky…more vintage sounding…Really smooth capsules that also work great with the ef800. I have a feeling an M7 style will work better in cv4 if you go after a really smooth sound especially for vocals
 

wave

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So I finally got to try the heiserman hk47. Wow…wonderful capsule. Although not an exact Neumann clone it has that neumanesque 3D image that I don’t hear in other k47 clones. A little more tamed in the mids but beautiful sounding and smooth with a very nice but not shrill presence.
i need to do further testing but I believe that the synergy of hk47 and ef800 can bring you a lot closer to the k47/vf14 combo than k47 and ef800. I have a feeling that ef800 doesn’t have the sparkle of the vf14 so the hk47 with the touch of extra air works better.
You have described/explained this exactly how I would...
 

doqmemory

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You have described/explained this exactly how I would...
I agree with you both, too. The 3U Audio M7 (or D7, when Dan finally gets his new lab set up) will give more of a contrast to the stock K67-style capsule in the CV4. I really like the HK47/EF802 (from Bowie) combo in my U47 clone (Oliver's alternate schematic), but the M7/EF800 in a similar mic sounds nice, too. The bottom line is that you will likely love either one, but you will probably want both.
 

Purplenoise

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I agree with you both, too. The 3U Audio M7 (or D7, when Dan finally gets his new lab set up) will give more of a contrast to the stock K67-style capsule in the CV4. I really like the HK47/EF802 (from Bowie) combo in my U47 clone (Oliver's alternate schematic), but the M7/EF800 in a similar mic sounds nice, too. The bottom line is that you will likely love either one, but you will probably want both.
I forgot it’s a 67 style capsule in cv4…unless the capsule itself is tuned do you think they have some sort of internal high end attenuation ? K47/m7 might be a touch dark in the mic then ( above 10k).
Hey did you do different biasing in Oliver’s circuit for the 802?
 
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wrentema

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Dec 16, 2020
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Berlin
I've contributed very little to this thread. But thanks for all the info (and the great PCB Dan!). I just fired it up. It's so quiet I wasn't even sure if it was on haha. So far it sounds very promising!

R2 and the H+ pot are fairly hot.. Not comfortable to touch.. Is this normal? The wattage should be fine R2 is 3W and pot 5W. The voltages are perfect..


WhatsApp Image 2021-10-11 at 16.56.22.jpegWhatsApp Image 2021-10-11 at 16.56.50.jpeg
 

Purplenoise

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So the experiment with the more modernized 47 style worked unexpectedly well.
-Stock Dan’s circuit and bias
-Heiserman hk47
-Terrapin toroidal 7.5:1 transformer
-0.47uf output cap ( Russian k42).
Very punchy and 3D with a great sense of realism yet very flattering. This seems to work equally well with instruments, male and female vocals…more versatile than a straight up 47 clone. To my ears it’s a wonderful blend of modern and vintage. The heiserman capsule is really awesome.
 

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