I'm on the list for 2 more. I have only built the first pair and this will make 4 more to go, but it is a great sounding amp and I have to plan for future projects.
Dario,
It is only one man's opinion, and I wouldn't want to delay others who are anxious to get their first FE, but that is a nice price break at 50 boards, so I wouldn't mind delaying until we got there.
Dario,
It is only one man's opinion, and I wouldn't want to delay others who are anxious to get their first FE, but that is a nice price break at 50 boards, so I wouldn't mind delaying until we got there.
You're right there's a nice price break from 50 kits (not boards, each kit = 2 boards).
25 kits is the minimum quantity necessary to order boards but it would be nice to reach 50 kits/pairs (100 boards) so to have the lower price.
It's also for this reason that the GB will remain open until the end of February...
Welcome Shoom,
with you we reached the minimum quantity of 25 kits, now the goal is to reach 50 kits for the price break
Thanks Dario
nice to push things along a little.
looks like an interesting build.
Welcome
Transformer requirements are:
160VA min, dual secondaries 24-25V (8 Ohm) or 21-22V (4 Ohm)
Higher VA ratings give a fuller sound,
R-Cores requirements are lower my 120VA one sound louder than a 225VA toroid.
For each kit (2 channel) two tranformers are required.
I would suggest partecipants to read at least the RC build thread, a lot of questions are already answered on it.
Render of PCBs
I've just figured out that I didn't posted any image of the final boards...
You'll find attached a render of the PCBs.
The main difference from Release Candidate boards is the fixed cofiguration for C9/R10 (different from My_Ref original one, as suggested by KSTR and tested during RC phase).
Other minor differences are some holes diameter and a more refined trace toward R3.
One final note about price... we've reached 35 kits/70 PCBs, price so far dropped to 32€/kit
I've just figured out that I didn't posted any image of the final boards...
You'll find attached a render of the PCBs.
The main difference from Release Candidate boards is the fixed cofiguration for C9/R10 (different from My_Ref original one, as suggested by KSTR and tested during RC phase).
Other minor differences are some holes diameter and a more refined trace toward R3.
One final note about price... we've reached 35 kits/70 PCBs, price so far dropped to 32€/kit
Attachments
Last edited:
Like this one?
But you will probably have to use R-Cores like I did, toroids are larger...
Hello Dario,
I read in the past great reviews of My_Ref amplifiers and I'm considering to build one for myself, then I'm happy that you are kindly starting a GB of an improved implementation.
I have some questions about your implementation (maybe some of them are covered elsewhere, this is just to collect info here):
1) about the transformer/s: do you think that 22Vac secondaries are ok?
2) is it known the behavior of my_ref amplifiers with low impedance speakers? (I have 4Ohm speakers, even with lower impedance minimum...)
3) about your kit, is the BOM available? (I read that you made a cost estimation already). If not, will you make one available here?
Thank you,
Daniele
I read in the past great reviews of My_Ref amplifiers and I'm considering to build one for myself, then I'm happy that you are kindly starting a GB of an improved implementation.
I have some questions about your implementation (maybe some of them are covered elsewhere, this is just to collect info here):
1) about the transformer/s: do you think that 22Vac secondaries are ok?
2) is it known the behavior of my_ref amplifiers with low impedance speakers? (I have 4Ohm speakers, even with lower impedance minimum...)
3) about your kit, is the BOM available? (I read that you made a cost estimation already). If not, will you make one available here?
Thank you,
Daniele
Ciao Daniele,
For 4 Ohm speakers, yes
It really depends on the speakers...
The My_Ref (and the FE has same advantages/limitations in this regard) has great driving abilities on 8 Ohm speakers and on most 4 Ohm (21-22V secories required) ones but it's still a 40W amp and very demanding speakers can cause troubles.
But I've no way to tell it in advance...
Both BOMs can be found on the first post of Release Candidate thread.
For 4 Ohm speakers, yes
It really depends on the speakers...
The My_Ref (and the FE has same advantages/limitations in this regard) has great driving abilities on 8 Ohm speakers and on most 4 Ohm (21-22V secories required) ones but it's still a 40W amp and very demanding speakers can cause troubles.
But I've no way to tell it in advance...
Both BOMs can be found on the first post of Release Candidate thread.
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