"Classic" Audio Tube Driver - Interstage Transformers

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124 Series		126 Series

Key Features (124 Series):

• Designed for general purpose or replacement use in single ended or phase inverter tube driver circuits.
• Open style with minimum 5" long primary leads.
• Minimum frequency response 150 Hz. - 15 Khz (+/- 1db max. ref. 1 Khz.) at full rated power.
• Our part number 124B is the same as our 124A except for 49% Nickel laminations for greater fidelity.
• Our part number 124C (below) is the COIL ONLY (for those experimenters who want to use their own "iron").
• If you are looking to replace Radiola III-A audio transformers, check out our universal replacement unit.

Part No.	Audio Watts	Primary		Secondary			Drawing File Size	Reader File	Laminations	Dimensions (Inches)
		Impedance (Ohms)	D.C. Resistance (Ohms)	Impedance (Ohms)	D.C. Resistance (Ohms)	Winding				A	B	C	D	G Mtg Hole
124A	5	10K	403	90K C.T.	1,524	C.T.		209K	Grain Oriented Steel	2.38	1.35	1.43	2.00	0.187
124B	5	10K	403	90K C.T.	1,500	C.T.		209K	49% Nickel	2.38	1.35	1.43	2.00	0.187
124C	5	10K	403	90K C.T.	1,524	C.T.		215K	None-Coil Only	-	-	-	-	-
124D	5	7K C.T.	454	15.8K C.T.	681	C.T.		209K	Grain Oriented Steel	2.81	1.46	1.68	2.38	0.187
124E	5	15K C.T.	728	33.8K/135K	3,880	Dual		226K	Grain Oriented Steel	2.88	1.74	2.37	2.38	0.187

Mechanical Data (124 Series):

Schematic & Hookup Data (124E Only - see PDF drawings for other parts):

- For Parallel connected operation (33.8K Ohm Secondary): Connect the GRN/YEL wire to the GRN wire AND the BLK/YEL wire to the BLK wire.

- For Series connected operation (135K Ohm Secondary): Connect the BLK/YEL wire to the GRN (this becomes the center tap) - GRN/YEL and BLK wires are the output.

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Key Features (126 Series):

• Designed for driver use ONLY in single ended tube output amplifiers. These units replace coupling capacitor circuits for improved sound.
• Closed style with minimum 8" long leads.
• All models use bifilar wound windings for exceptional coupling and bandwidth.
• Minimum frequency response 20 Hz. - 20 Khz (+/- 1db max. ref. 1 Khz.).
• The core is gapped to support the specified D.C. bias current.
• Maximum working voltage - 400 VDC
• Units are Hi-Pot tested at 1,000 VDC
• Core uses Hi grade silicon laminations (29M6).
• Units weight - 3 lbs. 2 oz.

Part No.	Audio Watts	Primary		Secondary		Inductance	Rated D.C. Bias Current	Dimensions (Inches)
		Impedance (Ohms)	D.C. Resistance (Ohms)	Impedance (Ohms)	D.C. Resistance (Ohms)			A	B	C	D	E	G - Mtg. Slot
126A	4	5K	178	5K	178	59 Henrys	15 ma.	2.50	3.12	3.12	2.0	2.25	.203 x .38
126B	4	5K	178	5K	178	44 Henries	30 ma.	2.50	3.12	3.12	2.0	2.25	.203 x .38
126C	4	10K	375	10K	375	106 Henrys	15 ma.	2.50	3.12	3.12	2.0	2.25	.203 x .38

Mechanical Data (126 Series):

Schematic & Hookup Data (126 Series):

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