Hi,
I open this thread in order to discuss potential other group buy activities primarily intended but not limited to buyers of the F5X case and the PCBs specially designed for this case. It should be open also for the buyers of the F5X amplifier PCBs from the diy-audio store.
This thread should:
- indicate whether there there might be a group buy interest with regard to a specific component
- identify such components
- identify volonteers who are willing to organize the group buy
Group buys might be useful for the acquisition of these components (in parantheses: primary motivation for group buy)
- power supply transformers (identification of manufacturers in addition to Canadian SumR in Europe/Asia)
- regulator MOSFETs (matching involved)
- power supply capacitors (possible huge discounts)
- rectifier diodes (possible huge discounts)
Anything else I forgot?
I open this thread in order to discuss potential other group buy activities primarily intended but not limited to buyers of the F5X case and the PCBs specially designed for this case. It should be open also for the buyers of the F5X amplifier PCBs from the diy-audio store.
This thread should:
- indicate whether there there might be a group buy interest with regard to a specific component
- identify such components
- identify volonteers who are willing to organize the group buy
Group buys might be useful for the acquisition of these components (in parantheses: primary motivation for group buy)
- power supply transformers (identification of manufacturers in addition to Canadian SumR in Europe/Asia)
- regulator MOSFETs (matching involved)
- power supply capacitors (possible huge discounts)
- rectifier diodes (possible huge discounts)
Anything else I forgot?
There was already some discussion on a possible transformer GB in the main thread starting with post #172:
http://www.diyaudio.com/forums/pass-labs/183362-f5x-euvl-approach-18.html#post2552942
Toroidy in Poland was mentioned as a possible manufacturer in Europe, as well as Canterbury Windings in the UK. I am unaware of manufacturers in Australia/Asia.
Due to high shipping costs, it is probably not practical to order from a single manufacturer.
Here are links to the homepages of the suppliers:
SumR: SumR - Richard Sumner Technology
Toroidy: TOROIDY.PL Transformatory Toroidalne Producent, Audio, Separacyjne, Trójfazowe, 230/110V, 110/230V, Na zamówienie
Canterbury Windings: Canterbury Windings Home
Anyway, I would be willing do to some organizational work in this GB, too.
http://www.diyaudio.com/forums/pass-labs/183362-f5x-euvl-approach-18.html#post2552942
Toroidy in Poland was mentioned as a possible manufacturer in Europe, as well as Canterbury Windings in the UK. I am unaware of manufacturers in Australia/Asia.
Due to high shipping costs, it is probably not practical to order from a single manufacturer.
Here are links to the homepages of the suppliers:
SumR: SumR - Richard Sumner Technology
Toroidy: TOROIDY.PL Transformatory Toroidalne Producent, Audio, Separacyjne, Trójfazowe, 230/110V, 110/230V, Na zamówienie
Canterbury Windings: Canterbury Windings Home
Anyway, I would be willing do to some organizational work in this GB, too.
i'd be interested in the toroids depending on timing, from sumR that is.
caps will depend, as i'm not in the case gb fairly specifically for reasons like this, as i will want to use rifa peh169 or similar and some larger unlytic type pp film shunt caps. i'm sorted for power relays for the foreseeable future, but you might want to band together for pricing on those.
titanium mounting bolts from the boltdepot which is utterly fantastic for fasteners of all kinds, great pricing and great range of bolts, washers, nuts etc and all come in different anodized colours and both imperial and metric. the flush-mount washers and matching countersunk head blts are perfect for fets and can be colour coded for easy identification of rail etc. more useful for amps with more outputs than the f5x
momentary switches could be another one. even hookup wire, contact me offline for that, i have a good line on bulk neotech upocc 16awg solid core in teflon if we can get the minimum order covered.
diodes perhaps, need to see the boms before we can make any more useful suggestions probably.
probably signal resistors too, prp for example you can buy direct from and get decent discounts, but takes a little while so we would want to get organized. on that note, the wire is about the only thing and perhaps bolts that i would maybe be able to help out with organizing. having just done a chunk of matching and running a sink gb, i'm not really up for anything that needs lots of work other than ordering and posting.
caps will depend, as i'm not in the case gb fairly specifically for reasons like this, as i will want to use rifa peh169 or similar and some larger unlytic type pp film shunt caps. i'm sorted for power relays for the foreseeable future, but you might want to band together for pricing on those.
titanium mounting bolts from the boltdepot which is utterly fantastic for fasteners of all kinds, great pricing and great range of bolts, washers, nuts etc and all come in different anodized colours and both imperial and metric. the flush-mount washers and matching countersunk head blts are perfect for fets and can be colour coded for easy identification of rail etc. more useful for amps with more outputs than the f5x
momentary switches could be another one. even hookup wire, contact me offline for that, i have a good line on bulk neotech upocc 16awg solid core in teflon if we can get the minimum order covered.
diodes perhaps, need to see the boms before we can make any more useful suggestions probably.
probably signal resistors too, prp for example you can buy direct from and get decent discounts, but takes a little while so we would want to get organized. on that note, the wire is about the only thing and perhaps bolts that i would maybe be able to help out with organizing. having just done a chunk of matching and running a sink gb, i'm not really up for anything that needs lots of work other than ordering and posting.
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Antek does not have a shielded 500VA 2x15V, but their non-shielded 500VA 4x15 one is within the size parameters. If there is sufficient interest, perhaps they can be persuaded to add an "AS-5215" to their product offerings. Price would likely be about $60/Tx and $11 shipping for two transformers.
Thanks very much, qusp, for your thoughts, reflections and your offer to help presumably in several aspects. Let's summarize. Other parts suitable for group buys are:
- mounting bolts
- switches
- hookup wire (I will send you a PM concerning this)
- (PRP) resistors
I have identified another item which is difficult to obtain and used in the EUVL case: Fischer SK 88-125 heatsinks used for the regulator MOSFETs and for the rectifier diodes.
Patrick mentions them here:
So far, I have only found the SK 88-100 (100 mm length), available from Buerklin.
I have not yet found the 125 mm variant. Here is the datasheet for the SK 88 series.
Prices from this vendor for the SK 88-100: 1-9 € 10,00/piece; 10-49: €8,51/piece; 50-99: €7,50/piece; 100 and up: €6,72 (19% VAT included)
This heatsink is also available as 1000mm (1m) variant.
Price for one sink: €57,00 (19% VAT included). Cutting this sink into 8 pieces of 125mm length would yield heatsinks of correct length costing €7,12 each.
PSU Transformers. Let's make a list:
SumR (Canada)
(part number: RC0600 915 5; see post #179 and confirmed in post #181)
qusp
Toroidy (Europe)
samoloko, mravinsky, heinz1
CeeVee intends also to buy from Toroidy (or has them already). I will send a PM to CeeVee.
I have never ordered from Toroidy before. It would be great, if a previous buyer could contact them and ask for an offer.
Antek (USA)
alazira
to be seen whether there is enough interest
Here is the transformer specification.
This specification defines a 500VA transformer with enameled leads. We (the European buyers) have to decide whether we go for a 600 VA transformer (as with the SumR transformers) or whether we prefer flexible leads. (For discussion see here).
SumR (Canada)
(part number: RC0600 915 5; see post #179 and confirmed in post #181)
qusp
Toroidy (Europe)
samoloko, mravinsky, heinz1
CeeVee intends also to buy from Toroidy (or has them already). I will send a PM to CeeVee.
I have never ordered from Toroidy before. It would be great, if a previous buyer could contact them and ask for an offer.
Antek (USA)
alazira
to be seen whether there is enough interest
Here is the transformer specification.
This specification defines a 500VA transformer with enameled leads. We (the European buyers) have to decide whether we go for a 600 VA transformer (as with the SumR transformers) or whether we prefer flexible leads. (For discussion see here).
Thanks, CeeVee, for your help!
Now we have to decide whether we ask for 500VA or 600VA transformers.
A few remarks by EUVL on that issue in response to might help.
It would be also good to know whether the individual buyer would have a choice between enameled and flexible leads.
Now we have to decide whether we ask for 500VA or 600VA transformers.
A few remarks by EUVL on that issue in response to might help.
It would be also good to know whether the individual buyer would have a choice between enameled and flexible leads.
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i actually just asked them about this exact thing the other day, thats a good idea, i would suggest the 600va though. thats for test builds, as i have a number of power amps on the bench and they will end up either powering the aleph jx, or staying as resident test iron. i'm also looking into large 450va Rcores from japan $$$$
i'll shoot you a reply in the morning about the wire, only that and perhaps the bolts etc i would perhaps help out with. we would need to reach 100m of the wire for me to reach my minimum order, but thats not a lot of power wiring, output wiring and a few people wanting speaker cables. they only do solid core though, which is great for me and is my favorite larger gauge wire.
the prp i can put someone in touch with the rep there, they will deal with anyone, so its not a problem.
i would participate in the switch gb, but not organize it, which i think is a really good one, but a problem might be deciding on a style that everyone is happy with. they are (Apem) imo a much nicer switch than the standard Bulgins that you see everywhere and they have a large range, i prefer discrete leds and a really nice brushed metal push-button to the led ring push buttons that have become kinda passe imo. i think buerklin have them, but depending on numbers we might be able to contact them directly. ive found with my business that most companies will do such a thing, as long as its not insultingly small order
nice idea with getting it in 1m, you could probably convince them to go larger if its possible to ship larger practically, i'll be sticking to conrad for everything though, since they are local (as local as one can be on the other side of the island)
and i really think you guys would do well to team up to get crydom SSR power relays for the protection cct, though i have enough of them and magnatech to last me for years, but its the sort of item you tend to get very good reductions on.
> A few remarks by EUVL on that issue in response to might help.
500VA winding on 600VA core.
http://www.diyaudio.com/forums/pass-labs/172770-balanced-f5-question-12.html#post2371245
http://www.diyaudio.com/forums/pass-labs/172770-balanced-f5-question-13.html#post2378366
Patrick
500VA winding on 600VA core.
http://www.diyaudio.com/forums/pass-labs/172770-balanced-f5-question-12.html#post2371245
http://www.diyaudio.com/forums/pass-labs/172770-balanced-f5-question-13.html#post2378366
Patrick
Unfortunately, Antec's 600VA transformers have a height of 78.74mm, which is more than EUVL's case spec of 75mm max, although not by much.
Patrick, how much tolerance on this?
The distance between the top of the cradle and the bottom of the regulator heat sink is 95mm.
Other than the transformer, you need to allow for :
-- transformer mounting hardware, including bolt heads
-- TO220 rectifier diodes with P2P wiring
-- wiring to and from the diodes
-- space to avoid cooking the transformer insulation
And I am sure Antec would not be delivering exactly to 78,740,000nm, so you should allow for some tolerances.
I would not say no way, but it is getting tight.
600VA core is nice to have and not must have. 500VA already has a factor of 3 margin.
Whether you have hum or not depends also on how well the transformer is designed & made.
Patrick
Other than the transformer, you need to allow for :
-- transformer mounting hardware, including bolt heads
-- TO220 rectifier diodes with P2P wiring
-- wiring to and from the diodes
-- space to avoid cooking the transformer insulation
And I am sure Antec would not be delivering exactly to 78,740,000nm, so you should allow for some tolerances.
I would not say no way, but it is getting tight.
600VA core is nice to have and not must have. 500VA already has a factor of 3 margin.
Whether you have hum or not depends also on how well the transformer is designed & made.
Patrick
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