Telefunken ELA M 251 Clone Tube Microphone Build Thread (D-Ela M 251E)

[egroys]

Alright. What difference will the 1uf make? Can you possible link to a Mouser material number that could work?
I’ve read somewhere that I should go for Polystyrene & Tantalum capacitors.

You're going to have to source those on eBay, most likely. Search this thread about "coupling" caps and you'll see what folks say.

 

[magnusp71]

Both mics have Ami t14, 1uf 150v wet tantalum coupling cap, nos ge 6072. The differences are the type of 22uf cap ( I kept the value) and grid resistor value. Beesneez sounds better to me with an electrolytic 22uf and tim Campbell with a wet tantalum at that position.
As far as the grid resistor goes the beesneez is 250M and the ct12 30M.
I prefer the mic with stock/original values. It might not sound as impressive in the low end but I don’t need to touch the low end during mix. Plus the proximity effect is much more usable. The 250M to me sounds a little bloated and I always have to take some lows out during mix.

Hi there. Thank you for sharing this. Would really like to know which caps you ended up using (part number)?
I'm trying to find substitues for these to caps in the original BOM, but not really sure how to make sure that they fit the circuit and PCB

 

[Purplenoise]

Hi there. Thank you for sharing this. Would really like to know which caps you ended up using (part number)?
I'm trying to find substitues for these to caps in the original BOM, but not really sure how to make sure that they fit the circuit and PCB

Hey there. Since then I have changed a few things around after using this circuit in sessions. For the 22uf I use electrolytics…nichicon is pretty good. If you can’t find 6.3v you can use 10 to 50v since they are small enough to fit the circuit. I wasn’t very fond of elna silmic though that many people tend to use…or the much more expensive black gates.
As far as the output cap…I ended up with 1.7uf wet tantalum but surprisingly an electrolytic works there pretty good too. A more present upfront sound than the suggested film caps.

 

[magnusp71]

Hey there. Since then I have changed a few things around after using this circuit in sessions. For the 22uf I use electrolytics…nichicon is pretty good. If you can’t find 6.3v you can use 10 to 50v since they are small enough to fit the circuit. I wasn’t very fond of elna silmic though that many people tend to use…or the much more expensive black gates.
As far as the output cap…I ended up with 1.7uf wet tantalum but surprisingly an electrolytic works there pretty good too. A more present upfront sound than the suggested film caps.

Thank you so much.
I’ve ordered the 1.7uF wet tant for output and a 22uF wet tant for the C3 as well (will try with nichicon if it doesn’t sound as good as expected). These are the items:

Output:
https://www.mouser.dk/ProductDetail/74-109D175X9125C2

C3:
https://www.mouser.dk/ProductDetail/74-135D226X9075C6 or

https://www.mouser.dk/ProductDetail/647-UKW2A220MED

 

[Purplenoise]

Thank you so much.
I’ve ordered the 1.7uF wet tant for output and a 22uF wet tant for the C3 as well (will try with nichicon if it doesn’t sound as good as expected). These are the items:

Output:
https://www.mouser.dk/ProductDetail/74-109D175X9125C2

C3:
https://www.mouser.dk/ProductDetail/74-135D226X9075C6 or

https://www.mouser.dk/ProductDetail/647-UKW2A220MED

Oh wow…you got them from mouser. Those are way too expensive for any difference they might have on the circuit. I got them on eBay for..a fraction of new prices