I'll see if I can sketch up a schematic of my plan. I didn't realize the M2 wires the Edcor as an autoformer with both windings connected. Edcor makes a 10K:150 transformer, might be good for more gain if wired backwards.
Good morning gentlemen,
Building two Mofo mono block is my new audio project and I start to list all components to order...
I would like to use the best of it and I am feeling a little bit lost concerning resistors ( too many reference, different temp. coefficient, etc)..
Please could you advise me with precise references ( Vishlay n°…)
About heatsink, do you have, please, link to interesting products. I am looking for efficient and beautifull sculptural extrusion. I would like to build attractive design.
I thank you really much.
Musically yours
TYM
Building two Mofo mono block is my new audio project and I start to list all components to order...
I would like to use the best of it and I am feeling a little bit lost concerning resistors ( too many reference, different temp. coefficient, etc)..
Please could you advise me with precise references ( Vishlay n°…)
About heatsink, do you have, please, link to interesting products. I am looking for efficient and beautifull sculptural extrusion. I would like to build attractive design.
I thank you really much.
Musically yours
TYM
You do not find such high quality resistors in many commercial amplifiers
https://www.mouser.fr/datasheet/2/427/cmfmil-109690.pdf
Vishay Dale RN60 or RN65 or CMF , RL cost more..
https://www.mouser.fr/Vishay/Passiv...zekj6Z1yzekiwZ1z0zls5Z1yzuosyZ1yzv7erZ1yzveax
@ TYM
This Vishay Dale resistor has great audio quality / specifications / price ratio.
It's easy to spend money on more exotic boutique resistors like non inductive Mills wirewound, Tantalum,Z-bulk foil etc.
but You need experiment by yourself and find conclusion is worth or not.
This Vishay Dale resistor has great audio quality / specifications / price ratio.
It's easy to spend money on more exotic boutique resistors like non inductive Mills wirewound, Tantalum,Z-bulk foil etc.
but You need experiment by yourself and find conclusion is worth or not.
Attachments
If anyone is interested in building one i have this laying around.
2x Hammond 193v
2x Meanwell PS
2x Build PCB (mosfet on the backside)
Shoot me a PM with a offer. US only please
Mod note. This has now been sold to mordikai. 24th Aug 2019
2x Hammond 193v
2x Meanwell PS
2x Build PCB (mosfet on the backside)
Shoot me a PM with a offer. US only please
Mod note. This has now been sold to mordikai. 24th Aug 2019Attachments
Last edited by a moderator:
The PCBs were available at the diyaudio store, but are currently out of stock:
MoFo – diyAudio Store
MoFo – diyAudio Store
I see MOT 's recommended as a choke for the Mofo. Off course those would be transformers with a 110 V primary, would an European MOT with a 220 primary be OK? I measured one and DCR is 1,6 Ohm. Inductance I dont know yet.
Because those MOT's are welded, not very firmly, wouldnt it be better to saw them open, rewind with different wire an add an air gap?
Because those MOT's are welded, not very firmly, wouldnt it be better to saw them open, rewind with different wire an add an air gap?
If I were you, I would just quick build Mofo with this MOT on a breadboard, and check frequency response and heat dispersion. Watch out high voltage.
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Yes, someone else did this and posted images some time ago. I'm thinking he reported just using a hacksaw on the poorly welded seams - they open up pretty easily (though, I haven't done this myself).
DCR above 0R5 or so will only lead to more heat than necessary in the transformer.
Some very very good wirewounds are Vishay Dale NS series. NiCr Ayrton Perry non inductive for the input. I tested them on my modified 30w Hiraga, and they sounded a bit cleaner thand the RN series to my ear.
Cheers