Ela-M 251 Body from Aliexpress

[geekmacdaddy]

Nice! Could you possibly share all the resistor and cap values you ended up using?

Those are the ones.

 

[magnusp71]

Those are the ones.

What about the 3uF output cap, the 22uF C3 and grid resistor?

 

[geekmacdaddy]

What about the 3uF output cap, the 22uF C3 and grid resistor?

3uf became .68uf (PIO) C3 is 22uf, grid resistor 2.7 I've been recording acoustic guitar using the 251 in this configuration with stunning results.

 

[Recording Engineer]

I used my Barbaric 251 (CT12, AMI 14/1) on acoustic guitar for the first time recently. Sounded good, but noisy as hell. Had to use a copious amount of noise-reduction to save my ass (really though, I had 2 other close mics and a pair of other mics further away). Guess I ought to try a different 6072 in it I suppose. Think I have another “good” one around besides another “bad” one and the one with a “bad” triode.

 

[Tim Campbell]

I used my Barbaric 251 (CT12, AMI 14/1) on acoustic guitar for the first time recently. Sounded good, but noisy as hell. Had to use a copious amount of noise-reduction to save my ass (really though, I had 2 other close mics and a pair of other mics further away). Guess I ought to try a different 6072 in it I suppose. Think I have another “good” one around besides another “bad” one and the one with a “bad” triode.

If you can't find a quiet GE6072 I would recommend the EH6072. The one in my FLEA is quiet and sounds as good as my 5 star GEs

 

[Recording Engineer]

If you can't find a quiet GE6072 I would recommend the EH6072. The one in my FLEA is quiet and sounds as good as my 5 star GEs

Chris at Barbaric had mentioned to me back in 2017 how great the EH is too! Think it’s about time I buy a couple then! Thanks!

 

[capacitorless]

IIRC and just fyi, there was an EH-6922 in my former Innertube MagMic. The tube was quiet and sounded good. I'm not sure it was the original tube that Stayne put in (probably not, based upon the wording of the sale when I bought it 2nd hand), but it worked well in that circuit. Just a little experience with another Electro-Harmonix tube type.

 

[geekmacdaddy]

3uf became .68uf (PIO) C3 is 22uf, grid resistor 2.7 I've been recording acoustic guitar using the 251 in this configuration with stunning results.

Please forgive. 250M grid.

 

[MicMaven]

Hi! What do you mean 'for bike exhaust'? Like a high heat spray paint?

I often use Rust-Oleum high heat spray paint marketed for painting tools and backyard BBQ grills, wood-burning stoves, engines or other metal items. They make a similar product for automotive use.

Great stuff. It dries very quickly to a matte finish in about 15 minutes - even faster if I use a heat gun - and turns out well after baking in the oven as Mr. @garp suggests. I use it on practically anything which calls for a flat black matte surface - wooden risers/shelves for my operating desk, small home-brewed speaker cabinets, metal project boxes, and lots more where I want a flat black matte surface something like a coarse power-coat finish. As always, your mileage may vary. James

 

[egroys]

I often use Rust-Oleum high heat spray paint marketed for painting tools and backyard BBQ grills, wood-burning stoves, engines or other metal items. They make a similar product for automotive use.

Great stuff. It dries very quickly to a matte finish in about 15 minutes - even faster if I use a heat gun - and turns out well after baking in the oven as Mr. @garp suggests. I use it on practically anything which calls for a flat black matte surface - wooden risers/shelves for my operating desk, small home-brewed speaker cabinets, metal project boxes, and lots more where I want a flat black matte surface something like a coarse power-coat finish. As always, your mileage may vary. James

I didn’t catch the oven part but it looks fantastic with just two light coats! (The lighting makes the body look whiter than it actually is)

 

[ElSmurf]

If you can't find a quiet GE6072 I would recommend the EH6072. The one in my FLEA is quiet and sounds as good as my 5 star GEs

That would explain why I didn't hear a significant improvement when swapping out the EH in my micparts V251 with a tested 5*GE.

 

[Recording Engineer]

Alright. Just picked-up a couple… Now someone needs to do the same with the 5751! I’ve had a couple of new ones from Sovtek for so many years, but still have never tried them in anything; as I still have a couple great GE 5-Star ones.

 

[rock soderstrom]

Also, there was some discussion in other threads with the 6s6b tube in an M251 circuit, about the R1 plate resistor.
Is it best to work off the 200k value like the ac701 schematic? or stick with the 100k like the 6072a schematic?

That's an interesting question, I'm also thinking about it right now, what is the consensus on this? I think I'll try 2.7k/22uf at the cathode and 200k at the anode for the 6s6b. Does anyone have any practical experience with this?

What is the 6s6b closest to?

The 5703 seems to be the western counterpart to the 6s6b