R/E/P Community

Please login or register.

Login with username, password and session length
Advanced search  

News:


Recent Posts

Pages: 1 [2] 3 4 ... 10
11
Mastering Dynamics / Re: Is this forum closed?
« Last post by Thomas W. Bethel on May 16, 2018, 06:07:09 am »
Seems like a ghost town these days.  Everyone has gone to other forums. 
Thanks for your posts, Thomas.

Anything we can do to bring people back? This is and always was a GREAT forum.
12
Klaus Heyne's Mic Lab / Re: Neumann km54 faulty
« Last post by fffaustino on May 16, 2018, 05:14:00 am »
Hi again Kai and Klaus,

I have checked all the things i could, considering my absolutly lack of knowledge about vintage mics..., here you are:

- Voltages on the mic side: 119,7V B+, 3,85V heater
- Plate voltage measured directly at the plate: 33,5V
- Noise with capsule removed: different noise, a "hum" noise instead of the "fire, wind" noise when capsule installed (i screened with alu foil, maybe i did not do it correctly..)
- C6 meassured correctly
- I knocked the housing tube and no changes in noise spectrum or level, maybe i not knocked hard enough...

After all this checkings i power off the psu, waited half an hour aprox, reinstalled the capsule and housing and power on the mic again, and surprisingly the mic worked perfect during 5 minutes or so, then started the "fire, wind" noise again and no signal incoming..

Any clue?

Thank you very much, in any case, and sorry for my english

Alfredo




13
Mastering Dynamics / Re: Is this forum closed?
« Last post by djwaudio on May 15, 2018, 11:00:13 pm »
Seems like a ghost town these days.  Everyone has gone to other forums. 
Thanks for your posts, Thomas.
14
Klaus Heyne's Mic Lab / Re: Which T14/1 for a DIY 251 ?
« Last post by Avgatzeblouz on May 15, 2018, 08:08:11 am »
Hi Jimi, I sent you a PM
15
Klaus Heyne's Mic Lab / Re: Neumann km54 faulty
« Last post by fffaustino on May 12, 2018, 06:16:51 am »
Kai, Klaus,

Thanks so much for your advices, i will try to follow them correctly and let you know..

thank you and best regards from Spain!

Alfredo
16
Recording - Engineering & Production / AD/DA and premp c
« Last post by Sergiovedge on May 11, 2018, 07:57:07 pm »
Have a buddy who has an mp2 and has decided to use AA. I anyone has  handy links to a good charger and rechargeable AA I'd really appreciate. Thanks
17
Klaus Heyne's Mic Lab / Re: Which T14/1 for a DIY 251 ?
« Last post by vinylwall on May 11, 2018, 07:25:20 pm »
Iíve not used the Haufe, but have built several mics with the AMI/Tab Funkenwerk T14 and been quite pleased with the results.

I have Oliver's Hiller style T14 in another 251 type build (again Mark at OPR did for me).  I feel compared to the Hauf there is a dB or two less bottom.  I feel like the mids may be slightly hotter in Oliver's, but that could be the other component differences as well (new OPR CK12 Replica vs. Vintage AKG CK12 capsule.)  Both mics have the GE 6072 5-star tubes, but of course there could be variances there as well.

I can't speak to comparisons to original AKG C12's or ELA M 251's as I do not have any.
18
Klaus Heyne's Mic Lab / Re: Which T14/1 for a DIY 251 ?
« Last post by aremos on May 11, 2018, 05:25:10 pm »
...
I also have an UPTON 251 and Dallas uses his own T14 in those builds, but I can't say that my C12 type build is heavier on the low end than the UPTON 251.

How does the Upton compare (besides that low end) to the custom-built with the AKG CK-12? Or, for that matter, to an original C12/Ela M251?
19
Klaus Heyne's Mic Lab / Re: Neumann km54 faulty
« Last post by klaus on May 11, 2018, 04:44:30 pm »
(After I wrote this, I got distracted and forgot to send it off. 2 hours later, Kai had already responded. We obviously agree how to trouble shoot this issue)

If the supply voltages fed to the mic are correct, you may want to test the plate voltage measured directly at the plate (filament with red lacquer dot on the glass), to see whether the tube is shot. A healthy AC701 plate voltage will read anywhere from the high 30s to low fifties, depending on KM54 version.

If you can also knock the housing tube hard with your knuckle, and see whether the noise spectrum or level changes, that would be a further indication that it's time to take out a loan.
20
Klaus Heyne's Mic Lab / Re: Neumann km54 faulty
« Last post by Kai on May 11, 2018, 04:20:27 pm »
Schematic Neumann KM54a
Pages: 1 [2] 3 4 ... 10