Gus

TF11
« on: September 27, 2020, 01:22:41 PM »


Spencerleehorton

Re: TF11
« Reply #1 on: September 27, 2020, 01:51:20 PM »
Possible to draw a schematic? It mentions similar circuit to m50? Which is also similar to Elam 260 circuit.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Ricardus

Re: TF11
« Reply #2 on: September 27, 2020, 07:30:14 PM »
The circuit certainly doesn't look that complicated.
Audio mastering for hire..

Spencerleehorton

Re: TF11
« Reply #3 on: September 28, 2020, 01:48:23 AM »
Is that a lsk489?
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

RuudNL

Re: TF11
« Reply #4 on: September 28, 2020, 03:54:49 AM »
Looks like they use a dual FET. (6 pins.)
Electronics look pretty simple.
Capsule looks at first sight like a standard capsule as made in Asia. (Although you never know...)
There is a solution for every problem!

http://www.vansteenisaudio.nl

Spencerleehorton

Re: TF11
« Reply #5 on: September 28, 2020, 04:42:03 AM »
If someone could trace the circuit im up for making one and seeing how it sounds!!
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Khron

Re: TF11
« Reply #6 on: September 28, 2020, 07:07:39 AM »
Am I the only one that's skeptical about how such mic electronics (ahem) "sound"?  ???

I mean, outside of clipping situations... How different can they really sound, really?  :o Obviously, discounting confirmation bias...

If someone could trace the circuit im up for making one and seeing how it sounds!!
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

Gus

Re: TF11
« Reply #7 on: September 28, 2020, 04:15:08 PM »
I might try to trace it
what can  you do with
two jfets

cascode with a cap from drain to gate to control the gain like a 8x

Phantom C, gain stage to SF

or?

mhelin

Re: TF11
« Reply #8 on: September 28, 2020, 04:54:49 PM »
A source follower with the other fet used as current source maybe?

Spencerleehorton

Re: TF11
« Reply #9 on: September 29, 2020, 07:59:50 AM »
looks like
1 x polyproperlene 470pf
2 x film caps (blue) ?
1 x red resistor?
7 x metal film resistors that could be 1.1k?, 2 x 5k, 10M, 700k?, 2.1k, 7.7k?
2 x electrolytic caps?
1 x dual jFET transistor
1 x 2.2uf 50v electrolytic cap
1 x 5k trimmer
1 x OEP txf (2:1?)
1 x edge terminated single side capsule

i think i got at least one resistor right!!!!
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!


analogguru

Re: TF11
« Reply #10 on: September 29, 2020, 08:45:42 AM »
looks like
1 x polyproperlene 470pf
2 x film caps (blue) ?
1 x red resistor?
7 x metal film resistors that could be 1.1k?, 2 x 5k, 10M, 700k?, 2.1k, 7.7k?
2 x electrolytic caps?
1 x dual jFET transistor
1 x 2.2uf 50v electrolytic cap
1 x 5k trimmer
1 x OEP txf (2:1?)
1 x edge terminated single side capsule

i think i got at least one resistor right!!!!
This sounds like there could be hidden some smd-parts on the track side.....

Pusch3l

Re: TF11
« Reply #11 on: September 29, 2020, 09:47:40 AM »
https://www.amazona.de/test-telefunken-tf11-fet-grossmembranmikrofon/

There are 2 good pics of the guts. No smd at the backside, just the OEP Transformer.

Spencerleehorton

Re: TF11
« Reply #12 on: September 29, 2020, 11:38:29 AM »
Pretty sure I could make a few of them for cheaper than €1000!!!
Those single edge terminated capsules are only about £30 ish, components I probably have all of them and have plenty of spare bodies which are similar!!
Sounds like a good alternative to the c414 for a bit more fuller frequency sound.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Pusch3l

Re: TF11
« Reply #13 on: September 29, 2020, 11:41:02 AM »
Pretty sure you can build one for under 1000 bucks.
it's mostly the name you're paying.

The specs from the OEP would be interesting though

mhelin

Re: TF11
« Reply #14 on: September 29, 2020, 11:45:51 AM »
Unless the red resistor is a 1G one the circuit can use some kind of bootstrapping to increase the input impedance, something like here:

https://sound-au.com/articles/fet-f4a.gif
https://sound-au.com/articles/fet-applications.htm

Re: TF11
« Reply #15 on: October 01, 2020, 01:22:46 AM »

mhelin

Re: TF11
« Reply #16 on: October 01, 2020, 06:23:40 AM »
Good source for LSK489, two fets in 6pin package:
https://store.nacsemi.com/products/detail?part=LSK489-TO-71&stock=LIS000000001244
Micross.com -> buy online, select linear systems, search for lsk

Moby

Re: TF11
« Reply #17 on: October 01, 2020, 11:30:17 AM »
Looks like they use a dual FET. (6 pins.)
Electronics look pretty simple.
Capsule looks at first sight like a standard capsule as made in Asia. (Although you never know...)
I would say that complete mic looks like Asia made. Especially the body and capsule. But I still like their Logo  ;)
For microphone transformers,  BV.8,  Bv.11,  Bv.12, etc.. contact me at mobyelectronics at gmail dot com

Spencerleehorton

Re: TF11
« Reply #18 on: October 01, 2020, 02:50:42 PM »
trying to work out the resistors and it looks like the following:
15k or 12M (brown,green,black,red,brown)
18M (brown,green,black,grey,brown)
1.82k (brown, brown, red, grey, brown)
2.67k (red,blue,purple,brown,brown)
100k (brown,black,black,orange,brown)
1G (brown,black,black,purple,yellow,black)
2.2k (red,red,black,brown,brown)

whats your thoughts?
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Pusch3l

Re: TF11
« Reply #19 on: October 01, 2020, 03:47:35 PM »
Looking at the picture from the Amazon link right now..
top site left from cap:
Purple, red, black, brown, brown

top site right from cap:
Brown, green, black, red, brown
Brown green, blue, orange, brown
Brown, orange , red, Grey, brown

Bottom site right from cap:
Red, green, purple, brown, brown
Brown, blue, black, orange, brown
Brown, blue, black, yellow, blue