Neumann M49 Clone : Build Thread Puck Style (TLM49 Conversion To M49 b-c)

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Delta Sigma

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Has anyone used a Fender style 6.3V pilot light?

I am not sure where to connect the bugger...
Should I be tapping h+ on from the pot or from pin 4 on the PSU?
Careful there. It's likely that your heater transformer won't be able to provide the current unless you used an LED bulb. I've had trouble finding LED bayonets at a reasonable price. I wanted to use Fender style pilot lights just because I have them on hand with multiple jewel colours. I ended up using 120VAC because I found 120VAC LED bulbs but unfortunately, they put off a lot of heat.
 

egroys

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Apr 18, 2020
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43
Careful there. It's likely that your heater transformer won't be able to provide the current unless you used an LED bulb. I've had trouble finding LED bayonets at a reasonable price. I wanted to use Fender style pilot lights just because I have them on hand with multiple jewel colours. I ended up using 120VAC because I found 120VAC LED bulbs but unfortunately, they put off a lot of heat.
Copy.
I did grab #47 LED bulbs. Am I correct to tap it from pin 4 & 7?

But I also have a regular 6.3v lamp I was told I could potentially use as a dummy load on the H+ for tuning.
Can anyone verify that?

Otherwise, I'm just about ready to start tuning it sans-capsule! Waiting on Dany's D7.

Not too shabby for a first build?
IMG_0461.JPG
 

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Purplenoise

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Sep 18, 2019
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268
Copy.
I did grab #47 LED bulbs. Am I correct to tap it from pin 4 & 7?

But I also have a regular 6.3v lamp I was told I could potentially use as a dummy load on the H+ for tuning.
Can anyone verify that?

Otherwise, I'm just about ready to start tuning it sans-capsule! Waiting on Dany's D7.

Not too shabby for a first build?
View attachment 80729
Looks good man
 

garp

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Jan 15, 2012
Messages
46
I am planning to use the beesneez bv11 for this build, is the pcb suitable for this tranny or should i have to wire it manually ?
 

Purplenoise

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Sep 18, 2019
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268
I am planning to use the beesneez bv11 for this build, is the pcb suitable for this tranny or should i have to wire it manually ?
Manually…which is actually easier. 4 wires on main pcb. You will use the bottom pcb for support…maybe even drill a couple of extra holes to securely strap the transformer in place. Just make sure you take under consideration the output cap size/placement
 

garp

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Jan 15, 2012
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46
Thanks a lot ! Now i have to find where primary and secondary are, there are no markings on it :(
 

garp

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Jan 15, 2012
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When i bridge some pins as indicated underneath bobin with red and blue markings and i measure the other pins i have around 1k across 2 pins and 20 ohms across the 2 others making me thinking that the first pair goes to pcb and the two others (lowest resistance) goes to the output right ? Well ... it's not very clear maybe ! when looking at the transformer pin facing me i count 6 pins in two groups of 3 upper side and 6 pins under . on the upper side i have a pencil mark joining in red pin 1 and 4 (from left to right ) and 3 / 6 in blue.
When i measure the "under" pins i have 1k between 7 and 10 and 20 ohm between 9 and 12 .
edit : according to this it seems that i can use Dan's pcb ...
 
Last edited:

egroys

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Apr 18, 2020
Messages
43
So my pair of 49c's has been working brilliantly for almost 2 months. Keeps beating out everything I have on female vocals!

I began to notice noise during a vocal session today (soft singer, very high gain on a 1073 clone). It sounded like a candy wrapper gently being crumpled right up on the mic. No pattern to it but it's now happening consistently. I typically heat the mic for an hour + before a session.
Not hearing anything in the other 49.

How likely is it that my 6S6B-V is on the fritz? I live in Los Angeles so I doubt that it's humidity...

Also, does is it a good/bad idea to be powering my PSU's through a UPS (CyberPower 900va AVR)?
 

Purplenoise

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Joined
Sep 18, 2019
Messages
268
So my pair of 49c's has been working brilliantly for almost 2 months. Keeps beating out everything I have on female vocals!

I began to notice noise during a vocal session today (soft singer, very high gain on a 1073 clone). It sounded like a candy wrapper gently being crumpled right up on the mic. No pattern to it but it's now happening consistently. I typically heat the mic for an hour + before a session.
Not hearing anything in the other 49.

How likely is it that my 6S6B-V is on the fritz? I live in Los Angeles so I doubt that it's humidity...

Also, does is it a good/bad idea to be powering my PSU's through a UPS (CyberPower 900va AVR)?
It’s not uncommon for a tube to be defective. I would try switching the cable first to eliminate that there is not a bad contact in the cable itself. I guess you have two cables right?
It could also be the capsule…you could easily find out by switching capsules.
 

Delta Sigma

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Joined
Dec 4, 2010
Messages
415
Location
Winnipeg
So my pair of 49c's has been working brilliantly for almost 2 months. Keeps beating out everything I have on female vocals!

I began to notice noise during a vocal session today (soft singer, very high gain on a 1073 clone). It sounded like a candy wrapper gently being crumpled right up on the mic. No pattern to it but it's now happening consistently. I typically heat the mic for an hour + before a session.
Not hearing anything in the other 49.

How likely is it that my 6S6B-V is on the fritz? I live in Los Angeles so I doubt that it's humidity...

Also, does is it a good/bad idea to be powering my PSU's through a UPS (CyberPower 900va AVR)?
I had the same thing happen with my 6S6B.

Strangely, I replaced it with the 5840 that lost the original shootout and preferred the 5840 this time around. The 6S6B has this low-mid richness that is so very appealing in a shootout. The 5840, however, has a nicer top end and I felt that the 5840 worked better in a mix.

Anyway, given the frustration of swapping out a leaded tube, plus burning the burning in period, I'm happy to use the seemingly more reliable 5840.
 

egroys

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Joined
Apr 18, 2020
Messages
43
Thank you, gentlemen. I checked the cable before ultimately changing the tube. Sounds great now.

Curious if anyone had issues centering the capsule due to the need to carve some of the lowest PCB to fit the Studio 939 body?
How much does that matter if it's only slightly off center?
 
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