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 ?