KrellClone KSA100-MKII 1000VA toroidal transformer EUROPE GB

[Flodstroem]

Hi

I have purchased two units of this transformer just for to get the possibility to go further with this KSA100 project (and thanks Ryan for the good tip):

http://www.diycable.com/main/product_info.php?cPath=140_141&products_id=597

Looks like a good transformer for the project except for the aux-windings for the 60-72V DC.

I ordered those for to be shipped by sea freight, weight: 50.60 lb. 4 weeks at sea and total shipping, Sea: 295 NOK (jetCarrier in Norway) which is approx. $ 47.00 + $ 45.50 (from Diycable to the carrier in the US), total shipping approx. $ 92.50 and transformers: $ 88 each unit = $ 176 Totals would then be $ 134.25 If adding custom tax (25%) an duties (200 NOK) those transformers would costs approx. $ 184 each unit when putting my hands on them.

Anyone member in the US who have tried this transformer?

Regards

 

[RKH]

I purchased two transformers but have not tried them in situ. The fabrication quality appears to be first rate. The packaging was also very high quality. It will be a while before I get to put them to use.

Ryan

 

[Fix]

Floedstrom:

Look nice, but how about aux-windings for the 60-72V DC
Did you find any good trafo for that ?


Shall we close this GB and settle for the trafo listed at Diycable ?



Shipping: At DIYCable where do I choose freight by Sea, or just mail them ?

 

[samoloko]

I still don't know why we are not asking www.amplimo.nl for a qoute with the spec of avel trafo
It will not hurt at all
they are audio grade, europe based - less taxes, hq brand

diycable trafo looks suspicious to me

 

[Fix]

OK, maybe you're right.


Ask Floedstrom to post all Details for trafo, then you can ask them for a pricequote.

Then we decide.

I still vote for the Avel version, price is high, but I get all voltages I need.

 

[samoloko]

I will ask for a qoute
are you agree with that spec for audio grade transformer

Primaries:

dual 120V or one 230V - please suggest


Secondaries (total 5 windings)

bifilar 2x 38.5V RMS at 12A RMS

bifilar 2x 60V RMS at 0.8a - I don't know If that Is too high - please suggest

single 12V x 0.8a

option

STATIC SHIELD between primaries and secondaries.

MAGNETIC SHIELD = 70mm

 

[Flodstroem]

Hi samoloko, if reading the KSA100-Wiki you will find all data needed for to order a suitable transformer. The Wiki kan be found here (read the transformer information):
http://www.diyaudio.com/wiki/index.php?page=Add+your+names+join+the+group+buy

Regarding closing of the transformer-GB, I have only ordered two x-formers for to be able to feed amps for to be able to check everything. When finishing the project my intention are to order those Krell originals. And the Diycable x-formers will be used to feed a Gregg 300W MosFET-amp (210W with those x-formers).

If using a voltage doubler maybe it is possible to use the 2 x 13V but Im not sure if the Amperes are enough. A maximum of 0.18A are available if using a voltage doubler (e.g. 13V x 1.4 x 4=approx 72V @ 0.18A)

 

[AndrewT]

If using a voltage doubler maybe it is possible to use the 2 x 13V but Im not sure if the Amperes are enough. A maximum of 0.18A are available if using a voltage doubler (e.g. 13V x 1.4 x 4=approx 72V @ 0.18A)

consider totem pole of the 13+37Vac windings, with separate rectifiers for the low current supplies.
Hum elimination may be a problem but should be solvable.

 

[Flodstroem]

Hi AndrewT. The 2x 13V are a 26V winding including a center tap. Not two separated windings if this is of any importance.

samoloko, I wrote to Amplimo for a price quotation. Lets see when answer arrives what the price will be.

 

[Fix]

Sounds to me that there still is interest in the Avel trafo ?

1-4 units: £ 200 ($ 400)
5-29 units: £ 155 ($ 310)

To sum it up, we will reach 5pcs, not 29pcs, maybe we can get a price on 10pcs ?


It appears that we are 3-4 people that are very interested in the trafo GB.

Fix, Floedstrom, Samloko

1. Shall we take more quotes from other manufacters ?
2. Shall we go for the DIYCable trafo ?
3. Shall we realise the GB for the Aveltrafo ?

Shall we talk over IRC or similar to decide what to do ?



Floedstrom: I thought you settled with the DIYCable trafo.

 

[AndrewT]

Hi AndrewT. The 2x 13V are a 26V winding including a center tap. Not two separated windings if this is of any importance.

samoloko, I wrote to Amplimo for a price quotation. Lets see when answer arrives what the price will be.

dual 13Vac is required for the totem pole.
CT does not work, sorry for the misinformation.

But, can you access the centre tap and split it?

 

[Flodstroem]

But, can you access the centre tap and split it?

Andrew, most likely not when studying the pictures. (note: I havnt received my two units yet). But its possible the CT has been wired in a way so the two copper leads from each winding are routed in a common sleeve

But for the test of my six monoblock Im going to use a smaller x-former for the input and driver stage.

 

[samoloko]

Hi AndrewT. The 2x 13V are a 26V winding including a center tap. Not two separated windings if this is of any importance.

samoloko, I wrote to Amplimo for a price quotation. Lets see when answer arrives what the price will be.

thx

 

[Fix]

Any news about the qoute from Amplimo ?

 

[Flodstroem]

I have heard nothing so I posted a reminder. Maybe they are not interested to make that type of big custom transformers

 

[Flodstroem]

Nothing from Amplimo at this week. Guess they are not interested....
Someone that could give them a phone call?

 

[Fix]

OK.. looks like they don't care..
Guess a phone call could do it.

Is there any other Trafo manufactor that we can check with, or shall we decide for Avel ?

I vote for a trafo that has ALL needed voltages, even the 62v.

 

[Fix]

Anyone ?

Avel or search for more trafos ?

 

[samoloko]

maybe jacco could speak with amplimo

 

[Fix]

Shall we decide for AVEL trafo since nothing new happens ?


Floedstrom: Have you recived your trafos from DiyCable ?