freshtapescent
Well-known member
- Joined
- Jan 25, 2014
- Messages
- 45
From Altec's famed 'Hollywood' era, here is a wonderful example of a very rare and sought-after tube output transformer from the late 1940's. Used in various Altec power amplifiers with push-pull output stages comprised of a pair of 6L6's or 807's.
Original published specifications:
Altec TL-217B Output Transformer (Same as TL-217A, except with 12" long leads)
Max Operating Level: +35dB / 19W (ref 6mW)
Frequency Response: FLAT within 1dB from 20Hz-20kHz!
6.6 kOhm center-tapped primary, Max primary current 65mA, current unbalance should not exceed 7mA
10 & 20 ohm secondary taps
3 ½” x 3 5/8” x 4 1/8” (approximately 8.9cm x 9.2cm x 10.5cm)
Approximately 6 lbs / 2.75kG
This item was purchased at the estate sale of a locally renown amplifier technician and Altec fanatic in his 90's. His license plate read "ALTEC' for over 30 years. He was a certified Altec tech going back to the 1950's, and had quite a bit of Hollywood-era equipment, including a pair of Altec A-324 amplifiers. This transformer was purchased in a plastic bag marked "TL217B - 324 Spare" and matches resistance measurements of other TL-217 transformers. That information, along with the matching dimensions, weight, and number of primary and secondary windings gives me very very high confidence in the origin and model of this vintage transformer.
Resistance measurements made with a Fluke 115 multi-meter. Resistances are consistent with measurements made of two other fully functional TL-217 transformers.
Primary
Black to Brown: 264 Ohms
Brown to Brown: 133 Ohms
Brown to Black: 132 Ohms
Secondary
Black to Yellow: 1 Ohms
Black to Grey: 1.1 Ohms
Grey to Yellow: .6 Ohms
From any primary wire to any secondary wire, resistance measures over 1megOhm, showing insulation no shorts between primary and secondary windings.
Guaranteed as-described. PM me if interested.
Original published specifications:
Altec TL-217B Output Transformer (Same as TL-217A, except with 12" long leads)
Max Operating Level: +35dB / 19W (ref 6mW)
Frequency Response: FLAT within 1dB from 20Hz-20kHz!
6.6 kOhm center-tapped primary, Max primary current 65mA, current unbalance should not exceed 7mA
10 & 20 ohm secondary taps
3 ½” x 3 5/8” x 4 1/8” (approximately 8.9cm x 9.2cm x 10.5cm)
Approximately 6 lbs / 2.75kG
This item was purchased at the estate sale of a locally renown amplifier technician and Altec fanatic in his 90's. His license plate read "ALTEC' for over 30 years. He was a certified Altec tech going back to the 1950's, and had quite a bit of Hollywood-era equipment, including a pair of Altec A-324 amplifiers. This transformer was purchased in a plastic bag marked "TL217B - 324 Spare" and matches resistance measurements of other TL-217 transformers. That information, along with the matching dimensions, weight, and number of primary and secondary windings gives me very very high confidence in the origin and model of this vintage transformer.
Resistance measurements made with a Fluke 115 multi-meter. Resistances are consistent with measurements made of two other fully functional TL-217 transformers.
Primary
Black to Brown: 264 Ohms
Brown to Brown: 133 Ohms
Brown to Black: 132 Ohms
Secondary
Black to Yellow: 1 Ohms
Black to Grey: 1.1 Ohms
Grey to Yellow: .6 Ohms
From any primary wire to any secondary wire, resistance measures over 1megOhm, showing insulation no shorts between primary and secondary windings.
Guaranteed as-described. PM me if interested.
