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Old 1st February 2010, 04:16 AM   #1
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Default R-Core Transformer Group Buy Interest?

Hi Folks,

I have the chance to import some R-core transformers (Japanese made cores/bobbins) for projects, in the 12VA range (SS, tube preamp filaments, etc.).

I got a sample of a dual 30V, 250mA ICAS (200mA CCS) (each) secondary for a BoZ project:

(click for larger)
Click the image to open in full size.

Dimensions are 72mm L x 61mm W x 36mm H and weigh 400g each (shipping weight would be 500g for packing+box weight).

The manufacturer was thinking of starting with either dual 30V, 24V, 18V and 12V secondaries (I'm sure I could talk him into dual 6.3V for us tube guys ).

Primary is dual 120V windings and 50/60Hz, so it could be used anywhere. Electrostatic shield drain wire for grounding is supplied.

Pricing would be $25/ea. and I'd get them 4 at a time, so any large orders may take a while.

Any interest? What voltages should I have built?

Cheers!
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Old 1st February 2010, 07:32 AM   #2
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The dual 30 would be of interest to me, maybe just a tad higher. I need to build a bias supply for an amp I'm builing that needs around 70 volts. If I but the dual secondaries in series, there should be adequate voltage to rectify and filter to get the required voltage.

Thanks

JD
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Old 1st February 2010, 09:58 AM   #3
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Hi,

If the bias supply doesn't need to supply any current to the grid, 60V should get you about 75-78V with the losses and trimpot loading, if not too heavy.

Cheers!
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Old 1st February 2010, 03:58 PM   #4
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precisely


JD


Quote:
Originally Posted by Geek View Post
Hi,

If the bias supply doesn't need to supply any current to the grid, 60V should get you about 75-78V with the losses and trimpot loading, if not too heavy.

Cheers!
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Old 1st February 2010, 05:05 PM   #5
Tea-Bag is offline Tea-Bag  United States
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these seem like good voltage ranges, but 12va seems like not too much current, even for a preamp.
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Old 1st February 2010, 05:58 PM   #6
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Would like to see dual 15v@say 50va for preamp and Dual 25v@250 for Gainclone.
Pete
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Old 1st February 2010, 09:31 PM   #7
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Quote:
Originally Posted by Tea-Bag View Post
these seem like good voltage ranges, but 12va seems like not too much current, even for a preamp.
I dunno, MooseFET and BoZ use within this amount as does this Hafler I have in for upgrade, they are the only SS preamps I'm familiar with in recent years.

The PAS3 uses about the same VA if you use SS rectification and lose that 12X4.

But other than the BoZ, I doubt the VA would be a "Pass crowd pleaser"


Quote:
Would like to see dual 15v@say 50va for preamp and Dual 25v@250 for Gainclone.
Hi Pete,

Larger sizes may be in the cards if this one is sucessful. Start small....

Thanks all for your input!

Cheers!
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Old 3rd February 2010, 03:36 PM   #8
h_a is offline h_a  Europe
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Are these made by Shilchar/India? Look absolutely identical!

Have fun, Hannes
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Old 4th February 2010, 03:43 AM   #9
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An associate gets them. I'm not sure

Cheers!
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Old 4th February 2010, 12:52 PM   #10
jtktam is offline jtktam  Canada
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I would be down for a few

-joe
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