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Old 10th March 2016, 09:31 PM   #1
Buran81 is offline Buran81  Israel
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Join Date: Mar 2016
Default Audio transformers and chokes

The pair of output transformers for the tube 6s33s

I have made them myself, having used my experience of making tube amplifiers and transformers for them.

The transformers are made on C-core HiB (0,23mm) cores, manufactured in ISRAEL, with their losses no more than 0.9W/kg. You also can see on the photos that the devices are winded frame less. It is a very neat kind of winding which does not allow any inaccuracies. The core air gap is chosen for DC current 250mA and generates a no signal core flux density of 0.9 Tesla. So it leaves a flux density swing of 0.9 Tesla for the signal. The primary coil resistance is 18ohm. The primary inductance is 8,5H (checked through an electrical outlet -50Hz)

Primary impedance: 1Kohm to 8ohm ( 7watt power)
Frequency characteristic: 7Hz-100Khz -3dB
500ohm to 4ohm (12watt power)
Frequency characteristic: 7Hz-62Khz -3dB

It is checked on tube amplifier 6S33S and 6AG7, with maximum power.!!
Quality of insulation: is more then 20Gohm checked with a megger 2500V,during 1 minute.

The insulation material is Mylar,which allows to make High Frequency Transformers!

The weight of each device is 5.9Kg

The price of the pair is 399$, NOT including the shipping
Attached Images
File Type: jpg 1.jpg (310.6 KB, 156 views)
File Type: jpg 2.jpg (289.5 KB, 151 views)

Last edited by planet10; 10th March 2016 at 09:48 PM.
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Old 10th March 2016, 09:48 PM   #2
Buran81 is offline Buran81  Israel
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Join Date: Mar 2016
The pair of output transformers for the tube 300B.2A3 .....
I have made them myself , having used my experience of making tube amplifiers and transformers for them.
The transformers are made on M6 EIcores ,manufactured in Italy . You also can see on the photos that the devices are winded frame less . It is a very neat kind of winding whichdoes not allow any inaccuracies.

The core air gap is chosen for DC current 80mA and generates a no signal core flux density of 0.8Tesla. So it leaves a flux density swing of 0.8Tesla for the signal.
The primary coil resistance is 162ohm.
The primary inductance is 40H (checked through an electrical outlet -50Hz)
Primary impedance: 3Kohm to 8ohm . 10Hz-50Khz -3dB
It is checked on tube amplifier GU50 and 6AG7 , with maximum power.!!

Quality of insulation : is more then 20Gohm checked with a megger 2500V ,during 1 minute .
The insulation material is Mylar,which allows to make High Frequency Transformers!

The weight of each device is about 3.7Kg

The price of the pair is 259$, NOT including the shipping
Attached Images
File Type: jpg IMAG6895.jpg (424.6 KB, 142 views)
File Type: jpg IMAG6896.jpg (390.7 KB, 132 views)

Last edited by Buran81; 10th March 2016 at 10:09 PM.
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Old 10th March 2016, 10:03 PM   #3
Buran81 is offline Buran81  Israel
diyAudio Member
 
Join Date: Mar 2016
The pair of the Interstage Transformers 1:1 (10Kohm:10Kohm) for such tubes like 6SN7, 6S2S,12AU7..…

I have made them myself, having used my experience of making tube amplifiers and transformers for them.

The transformers are made on C-core HiB (0.23mm) cores, manufactured in Israel. You also can see on the photos that the devices are winded frame less. It is a very neat kind of winding which does not allow any inaccuracies.

The core air gap is chosen for DC current up to 10mA.
The coil's resistance is 600ohm.
The primary inductance is 445H (checked through an electrical outlet -50Hz)
Frequency characteristic: 9Hz-19Khz -1dB. 6Гц-30кГц -2дБ. 4Hz-41Khz -3дБ (checked with the tube 6SN7. Rp is 8Kohm ).
Quality of insulation: is more then 20Gohm checked with a megger 2500V, during 1 minute.
The insulation material is Mylar,which allows to make High Frequency Transformers!
The weight of each device is 1.8Kg
Dimensions are 88*92*87mm
The price of the pair is 322$, NOT including the shipping.
Attached Images
File Type: jpg IMAG7023.jpg (502.9 KB, 130 views)
File Type: jpg IMAG7025.jpg (378.9 KB, 42 views)
File Type: jpg IMAG7024.jpg (215.3 KB, 30 views)

Last edited by Buran81; 10th March 2016 at 10:11 PM.
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Old 24th March 2016, 08:13 PM   #4
Buran81 is offline Buran81  Israel
diyAudio Member
 
Join Date: Mar 2016
The pair of output transformers for the tube300B.2A3 ,6B4G,GU-50.....
I have made them myself , having used my experience of making tube amplifiers and transformers for them.
The transformers are made on HiB (0.23mm)
C-cores ,
manufactured in China . You also can see on the photos that the devices are winded frame less . It is a very neat kind of winding whichdoes not allow any inaccuracies.

The core air gap is chosen for DC current 100mA and generates a no signal core flux density of 0.8Tesla. So it leaves a flux density swing of 0.8Tesla for the signal.The primary coil resistance is 105ohm.
The primary inductance is 64H (checked through an electrical outlet -50Hz)
Primary impedance: 5Kohm to 8ohm . 6Hz-67Khz -3dB
It is checked on tube amplifier GU50 and 6AG7 , with maximum power.!!Quality of insulation : is more then 20Gohm checked with a megger 2500V ,during 1 minute .
The insulation material is Mylar,which allows to make High Frequency Transformers!
The weight of each device is about 6Kg


The price of the pair is 455$, NOT including the shipping
Attached Images
File Type: jpg P_20160319_184924.jpg (304.5 KB, 21 views)
File Type: jpg P_20160319_184956.jpg (665.4 KB, 22 views)

Last edited by Buran81; 24th March 2016 at 08:16 PM.
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