Richard Lines
pfm Member
LesW/ Gavin are only a phone call away.........Is it possible to buy ready-built SE*** boards, or will Avondale fit them only? Is there an official answer to this, and if so, which boards can be bought?
Regards
Richard
LesW/ Gavin are only a phone call away.........Is it possible to buy ready-built SE*** boards, or will Avondale fit them only? Is there an official answer to this, and if so, which boards can be bought?
The SE200's are available as a ready built boards for the discerning DIYer. The SE230 and SE400 are Avondale fit only or a finished RMS amp.Is it possible to buy ready-built SE*** boards, or will Avondale fit them only? Is there an official answer to this, and if so, which boards can be bought?
Hi GrahamJames,
Looks like you have two 0v's going back to the dirty ends of the PSU's and two to the clean end.
Try moving 'all' of them to the clean end.
I only have the Transformer connected to the reciter (dirty) end.
G
Not sure what you mean? There's only a single mains earth connection to the chassis.Also looks like you have multiple earth wires to various points on the casing.
Might be worth looking at those too especially on bolt together cases ?
Well done James.Well after over a year of these boards being sat here looking at me I've finally got round to building an amp. It didn't blow up on switch on, that's a positive. Transformer buzzes like a hive however, which is not ideal. No difference on a dc blocker. Left channel has a mains/transformer buzz frequency hum, low level, but clearly audible at the speaker. Right channel quiet. Both channels play music, another positive! First impression after about 10 minutes of music, sounds different to the Qudos amp that was there for the past god knows how many years.
Hi Richard, yes, mechanical buzz from the transformer. Luckily they are only 25 mins down the road so I can drop it off if need be. I'll try re-routing the 0v wires but these cap boards only have 4 tabs at the clean end, 3 of which are already taken by the 0v wires from the SE boards. There is a tab I can use in the middle of the caps. The tabs on these are very tight together and fitting 4 next to each other is going to be a squeeze.Well done James.
I wonder how many others out there have 'bitten the bullet' and bought an ETC transformer.
Shielding is going to be an issue. I still need to look at my situation.
"The transformer buzz on mine is LOUD!" If that is a mechanical "buzz' then it sounds like it needs to go back to ETC!
"The speaker 0v and velleman 0v are connected to the transformer end of the cap6" - if you look at pictures of more recent builds AA do seem to be using the clean end currently. It's what I'm using on all my SE builds if only because it seems to make sense to do so - it is something Doug Self promotes.
Regards
Richard
James,Hi Graham
I've always worked off the wiring on this voyager tbh:
Detail of an early Voyager amp – AVONDALE AUDIO
avondaleaudio.com
The speaker 0v and velleman 0v are connected to the transformer end of the cap6. Is that not the done thing? I've done this in all my amp builds up to now I think,
My thinking at the moment is the audible hum (one channel only) is directly related to the transformer buzz (dual centre tapped secondaries). Richard also seems to be seeing something similar in his amps using these transformers, although slightly less audible it seems. The transformer buzz on mine is LOUD!
I've braided the secondary wires, could that be causing some effect that the transformer doesn't like?
James
Does it hum with the secondaries not connected?I'm wondering if it's an issue with the secondary feeding that one channel, because as you say, wiring is identical on both. I've mailed ETC anyway as the transformer noise as it stands is not workable.
Not tried it unconnected yet, will give that a shot tonight.Does it hum with the secondaries not connected?
I'd suggest you could use a piggy back crimp terminal on one of the outer connectors which would give a you a fifth contact point - that is what I did with one case where I used the HackerCap PCB's.I'll try re-routing the 0v wires but these cap boards only have 4 tabs at the clean end, 3 of which are already taken by the 0v wires from the SE boards. There is a tab I can use in the middle of the caps. The tabs on these are very tight together and fitting 4 next to each other is going to be a squeeze.
I have one of these here that I was originally intending using in this amp:
(how expensive are transformers these days!!!)
I may drop it in and see how it compares. Aside from the transformer noise the amp is sounding very nice I should add!
I ended up using some tap washers as a buffer between the Tx chassis and case..it did help.Might try some form of thin isolation pads underneath it, see if that at least stops the case amplifying it.