Hi guys,
call me crazy, but in my system M1 (mono bloc version of M2 🙂 ) outperform monsters XA60.5 in almost every way. From the first note it's clear that this is one phenomenal piece of kit. Naturalness first come to mind. It may be because tweeters in my speakers are so wrong? (BW 800D2) Is it maybe XA60.5 actually right and simply reveal all bad things of this bloody diamond tweeter? I don't know. But I do know that with M1's my speakers are simply amazing!
One more thing: I have more than enough power in my room, sitting some 3 meters from speakers.
Choky aka Zen present his work in blog and here, on BigDiya, only non-standard parts are C-core main transformer and some vintage Rifa PEH 169 cap's. Everything else standard. He even omit Cardas wires I supply 🙂 So typical for him hehehe
Many thx to NP!!!
call me crazy, but in my system M1 (mono bloc version of M2 🙂 ) outperform monsters XA60.5 in almost every way. From the first note it's clear that this is one phenomenal piece of kit. Naturalness first come to mind. It may be because tweeters in my speakers are so wrong? (BW 800D2) Is it maybe XA60.5 actually right and simply reveal all bad things of this bloody diamond tweeter? I don't know. But I do know that with M1's my speakers are simply amazing!
One more thing: I have more than enough power in my room, sitting some 3 meters from speakers.
Choky aka Zen present his work in blog and here, on BigDiya, only non-standard parts are C-core main transformer and some vintage Rifa PEH 169 cap's. Everything else standard. He even omit Cardas wires I supply 🙂 So typical for him hehehe
Many thx to NP!!!
Is a 5amp 24v supply sufficient ? I might use two 5amp 25v SMPS in series for a dual rail supply.
You might find yourself with some issues if you use two separate switching
supplies - they won't have the exact same frequency of emissions, and they
tend to "beat" to form audible noise. This is particularly true if one is used
for the (+) and the other for the (-) rail.
This is apart from the notion that RF noise interferes with the performance
of the amplifier circuits.
As a concept you can make this work with external supplies and enough
filtering, but it starts to be as much trouble as a transformer and caps.
😎
supplies - they won't have the exact same frequency of emissions, and they
tend to "beat" to form audible noise. This is particularly true if one is used
for the (+) and the other for the (-) rail.
This is apart from the notion that RF noise interferes with the performance
of the amplifier circuits.
As a concept you can make this work with external supplies and enough
filtering, but it starts to be as much trouble as a transformer and caps.
😎
Mr Pass,
Yes, apart from the beat note (I haven't heard a problem when used in class AB amp) is the 5amps enough?
Thanks,
X
Yes, apart from the beat note (I haven't heard a problem when used in class AB amp) is the 5amps enough?
Thanks,
X
If all you need is a 5 amp peak. That would be just enough for 20V
peak into 4 ohms, one channel only.
😎
peak into 4 ohms, one channel only.
😎
Meh... I guess a single 18vac 300va trafo is better since can handle both channels for 25v?
$41 for Antek toroidal and then caps.
A 18V AC transformer max give you 22.3VDC at Class A load. 300VA even less if you used it for stereo.. I would go min 400 or 500VA. 😀
Teabag has a group buy in the "group buy" forum here. It just ended, but last time he did this there were a few extra sets. Contact asap! If he is out of transformers, they come from edcor.
Russellc
My M2 will be alive in next day or so powered by my F6 power supply.
Where can I find the bias instructions for the M2, what to measure, values, etc?
TIA,
Jim
Where can I find the bias instructions for the M2, what to measure, values, etc?
TIA,
Jim
no Iq setting (it's ,say, autobiased) , just confirm voltage across source resistors is adequate for Iq of anything between 1A3 to 1A7
set offset with trimpot and that's it
set offset with trimpot and that's it
Teabag has a group buy in the "group buy" forum here. It just ended, but last time he did this there were a few extra sets. Contact asap! If he is out of transformers, they come from edcor.
I don't know where orders/supplies are now but IMO the boards that Teabag sells are excellent - some of the best I've seen.
Jim
I don't know where orders/supplies are now but IMO the boards that Teabag sells are excellent - some of the best I've seen.
Jim
My M2 is alive! I let it burn in a couple hours before listening. This is one fine amp. I only have a F6 clone to compare with in regards to other First Watt designs. I find the M2 more relaxed sounding. It projects a big sound with most of the detail of the F6. The nice surprise is that I can play it louder than the F6 without sounding strained. It's very easy on the ears and my big horn speakers. I will compare to my direct coupled 2A3s next but right now I think this amp could be the long term replacement I've been hoping for. (I only use this amp north of 65 hz as my subs are tapped horns powered by a Crest audio pro amp and active crossover.)
The picture shows the M2 boards in a temporary home with power being furnished from my finished F6 in the diystore chassis. Bottom line, I really like this amp. Thanks to all who helped me here and to Teabags for the first class boards. And a huge thanks for the man himself - Nelson Pass.
Jim
The picture shows the M2 boards in a temporary home with power being furnished from my finished F6 in the diystore chassis. Bottom line, I really like this amp. Thanks to all who helped me here and to Teabags for the first class boards. And a huge thanks for the man himself - Nelson Pass.
Jim
Attachments
anybody got a lead on the WNDR50FET 3W 0.5 ohm 1% Ive ordered from Mouser but shipping at the moment is not until November! A quick look this morning on line and i cant find in stock anywhere to ship to the UK?
Ok Ive just seen this so Im going to ask if they have in stock and shipping time
https://www.amazon.co.uk/gp/offer-listing/B017UTR5PQ
Dispatched from Czech Republic but only 19 reveiws in total and none for this product
Ill update on news
Ok Ive just seen this so Im going to ask if they have in stock and shipping time
https://www.amazon.co.uk/gp/offer-listing/B017UTR5PQ
Dispatched from Czech Republic but only 19 reveiws in total and none for this product
Ill update on news
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