Please try a different PSU. The amp sounding more "mature" (more AB class) was exactly the impression I got when I went for the Meanwell RPS-400-24@26V
@daniboun - which unit has clicking? The "first" picture shows the PSU with the yellow relay on the right, but the second picture shows it on the left? Mine has the yellow relay. I just bought a unit but as soon as I hooked up my LRS speakers and started playing music, I hear the PSU relay constantly clicking :-( Is this easily fixed by Sabaj/will they send me a replacement board or requires shipping back to China which means I'll just return for a refund.I don't have any click issue with the Morsun PSU, but there are 2 versions of the Morsun PSU's, I already pointed this )
picture @ right = my version from first picture
Hi jean-paul - I did contact the seller. He has offered to take it back but he has no other ones and since these are out of production hard to find new anywhere else. I got this for $150 and really like the functionality so am looking for anyway to have this upgraded to the new PSU. From what I've read it looks like the new A20a-2022 version has a different Infineon chip that seems to be not quite as good sound wise and with a lower wattage PSU (I need all I can get for the Magnepan LRS'). Same for the SMSL DA-9 and AO200 amp alternatives (I need an amp with balanced-inputs) and unfortunately my budget is limited to $250? Thanks JP/all for any guidance.
So I have to make a decision by end of today on either returning this unit or repairing this unit by 1) replacing the clicking relay (if it is that simple of a fix and a noob can do it), or 2) replace the whole power supply inside the amp with (2a) the same but newer Mornsun LOF350-20B24 PSU board, or (2b) someone here recommends a different PSU board that fits in this amp case. I sent an email to Sabaj over the weekend, but no response from them... I found the Mornsun PSU from DigiKey for $87 but not sure how to confirm it is a newer/fixed unit and now I'm pushing close to $250 which is more than the original list price.
Any suggestions or guidance or other options would be most appreciated!
Cheers - David
Any suggestions or guidance or other options would be most appreciated!
Cheers - David
So I've made a decision to keep this A20a amp and either replace the power supply, or fix the one that is in there. Mornsun has responded back to me and they seem great to work with. Very disappointed in Sabaj who have not replied to my email inquiry... OK, does anybody know exactly what part/relay needs to be replaced and is it doable by an inexperienced person and if so any part number suggestions? Thanks.
Better late then never, I modded the A20a (v2) as well. Mine came equipped with OPA1678 and swapped them for OPA1656. Hadn't I ordered the parts a year ago already, I would have used the OPA2156 instead. What else? Like suggested here I swapped the 10 caps for Silmic II (35V version) and swapped both caps near the NJM chip for Nichicon KZ (220uF, 50V). I use a standard Schaffner netfilter. I can confirm improvements in line with already described before; kind of highend-ish sounding.
Are you referring to the "flat" silver model? Take off the feet - there are screws underneath.