For Sale Monolith Magnetics Custom Output Transformers and Chokes

[malarkey]

I'm cleaning up and sell all the parts I collected in the past for projects that never left prototype state....

2 custom OPTs Parallel PP 2K2 4-8 Ohm 40% ultra linear taps,C-Core, 140 W, case 3,
very low capacitance with 18 chambers!! THE OPTs ARE SOLD!
4Ω 3.4 Hz - 102 kHz -3dB
8Ω 3.4 Hz - 79 kHz -3dB
Square wave response 10kHz : excellent
Distributed capacitance
Fres grounded 8,8kHz 1760 pF
Fres floating 18kHz 412 pF
induction L = 180 H (quality cores)
leakage induction 4.0 mH

600,00€ the pair(cost far more than twice that much when I bought them, today even more expensive),
since they are very heavy, shipping has to be calculated



2 custom chokes 4H 450mA, THE CHOKES ARE SOLD!
C-Core, 20Hz sat at full power and >100 kHz bandwidth,
Max AC saturation 640V 100Hz
Saturation without AC flux across the choke will set in at 0.81A
common mode operation on dual bobbin, low stray capacitance,
13 Ohms per winding = 27 Ohms in operation

 

[Diabolical Artificer]

What country are you in? EU, UK? Nice iron.

Andy.

 

[malarkey]

Germany, thanks.

 

[Diabolical Artificer]

That's a shame, they look very tasty and should make a nice amp, unfortunately a lot of people in my country voted to leave the EU which makes shipping such transformers especially un-viable, that and the weight. Hope you find a good home for them.

Andy.

 

[Bas Horneman]

You've got a forum dm malarkey.

 

[Bas Horneman]

I'm would like to buy the chokes.

 

[tjerneld]

I'm cleaning up and sell all the parts I collected in the past for projects that never left prototype state....

2 custom OPTs Parallel PP 2K2 4-8 Ohm 40% ultra linear taps,C-Core, 140 W, case 3,
very low capacitance with 18 chambers!!
4Ω 3.4 Hz - 102 kHz -3dB
8Ω 3.4 Hz - 79 kHz -3dB
Square wave response 10kHz : excellent
Distributed capacitance
Fres grounded 8,8kHz 1760 pF
Fres floating 18kHz 412 pF
induction L = 180 H (quality cores)
leakage induction 4.0 mH

600,00€ the pair(cost far more than twice that much when I bought them, today even more expensive),
since they are very heavy, shipping has to be calculated



2 custom chokes 4H 450mA, C-Core, 20Hz sat at full power and >100 kHz bandwidth,
Max AC saturation 640V 100Hz
Saturation without AC flux across the choke will set in at 0.81A
common mode operation on dual bobbin, low stray capacitance,
13 Ohms per winding = 27 Ohms in operation

220,00€ the pair (cost far more than twice that much), since they are very heavy, shipping has to be calculated


View attachment 1054792View attachment 1054793
View attachment 1054794

What do you mean with 18 chambers ?
One bobine with 18 sections or two bobins with 9 sections each ?
One or two C-cores ?
Weight ?
Resistance in primary winding ?

 

[malarkey]

Hello,

double C-Core with a very complicated 18 chamber winding(splitted pobbin design in the middle on both Cores)
as Monolith Mangnetics stated.

This was needed to get low capacity, perfect symmetry and resonance free behavior and also
very low leakage inductance of 4mH and an excellent Square wave response at 10kHz,
so its possible to use it as output transformer for parallel
power tubes in push pull configuration with low source resistance and also provide core saturation at
over 140W RMS.


primary impedance 2200 Ohms
RDC prim 64 Ω insertion loss
4 Ω 241m Ω 0.37dB
8 Ω 600m Ω 0.43dB

weight 9 kgs per transformer

exemple

 

[malarkey]

all transformers sold