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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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16th Sep 2021, 5:34 pm | #1 |
Diode
Join Date: Mar 2012
Location: New York, New York, USA.
Posts: 9
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Repanco TT-49 COIL INFO NEEDED
Repanco TT-49 COIL INFO NEEDED
I am in the process of building a radio and I am trying to find a substitute for the Repanc9o TT-49 coil. The ratio of the Repanco TT-49 coil is 4.5 to 1 but I need to know the primary and secondary resistance ? I anyone know the pri and sec impedance please let me know. Frank Last edited by Radio Wrangler; 17th Sep 2021 at 12:34 am. Reason: Typo in title fixed |
17th Sep 2021, 12:27 am | #2 |
Heptode
Join Date: May 2015
Location: Chatham, Kent, UK.
Posts: 947
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Re: Repanc9o TT-49 COIL INFO NEEDED
Hi the rex lt44 is used as a compatible tx in a radio constructor design the rex lt 44 is 10k/2k available here second down https://www.esr.co.uk/electronics/transformer-audio.htm . dont know if this right as no date on radio constructor page but the ratio is about right Mick ebay.com link https://www.ebay.com/itm/26400509446...0AAOSwvl9b0LtY
Last edited by mickm3for; 17th Sep 2021 at 12:33 am. |
17th Sep 2021, 9:06 am | #3 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,173
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Re: Repanco TT-49 COIL INFO NEEDED
Hi Frank, similar transformers with that ratio should work fine in your circuit. The winding resistance is not that important in these applications
Ed |
17th Sep 2021, 10:17 am | #4 |
Octode
Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,757
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Re: Repanco TT-49 COIL INFO NEEDED
Can you post the circuit where it's used?
1963 advert I've found quotes "TT49. Interstate, 20:1, 6/-". but it doesn't state if that's the turns ratio or the impedance ratio. |
17th Sep 2021, 10:31 am | #5 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,528
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Re: Repanco TT-49 COIL INFO NEEDED
Well, 4.5x4.5 = 20.25, so given post#1 is correct, 20:1 impedance ratio sounds about right!
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17th Sep 2021, 9:04 pm | #6 |
Hexode
Join Date: Oct 2010
Location: Box End, Beds. UK.
Posts: 271
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Re: Repanco TT-49 COIL INFO NEEDED
Since I think Repanco Bartlett still exist they may (I do stress may) be able to tell you if you ask
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