Re: [AMRadio] Need help identifying National part
Just for what it's worth, I agree that it seems to be an audio transformer of some variety, and you can BALLPARK the impedances by measuring the DC Resistance and multiplying by 10. Ohm out the coils and see if there are center taps. With 5 leads, it sounds like one coil has a tap. Whether or not it's in the center will be revealed by the VOM. Then too, it may be an inductor with multiple taps on one coil. Mr. Ohm's little meter will reveal all. Bill AD5OL - Original Message From: EP Swynar To: k5...@yahoo.com; Discussion of AM Radio in the Amateur Service Sent: Friday, December 26, 2008 11:49:42 AM Subject: Re: [AMRadio] Need help identifying National part Hi John, I checked my Radio Parts Master catalogue for 1964, as well as the catalogue sections of the 1948 & 1940 ARRL RADIO AMATEUR'S HANDBOOK --- nothing, nil, zilch, nada... I wonder if that part number is really a National number, per se...? Perhaps it's the part number of the MANUFACTURER who originally purchased the part for his OEM application... Hammond Manufacturing did the same thing with their transformers: they were custom made on occasion for a specific end user in quantity, with a unique part number affixed to the transformer that meant nothing, specifically, to Hammond itself, once the contract ran out (or at least I've been told as much by a Hammond engineer). Good luck, in any event...! ~73~ Eddy VE3CUI - VE3XZ *** - Original Message - From: "John King" To: Sent: Friday, December 26, 2008 11:22 AM Subject: [AMRadio] Need help identifying National part > Have New Old Stock National part number SA1288. Appears to be a transformer with two spade bolts to bolt to chassis and has the National diamond emblem which has "NC" in the diamond. It is tar filled and has five black leads coming out of it. It is shaped like a LARGE IF can but has no adjusting screws or slots as it is completely enclosed. The dimensions are: > 4" H X 2 3/8" D X 1 15/16" W. It weighs about one pound. > > It is NEW and unused still in the National Box. > > Looks like a transformer of some sort such as an audio transformer from one of the "OLDER" National receivers that had considerable audio output for a receiver such as maybe a pair of 6V6 tubes or something of that nature. > > If you have the facilities to cross reference the part number, I would appreciate if if you would let me know what it is and which piece of National gear it was made for. > > Your help is appreciated. 73, John, K5PGW > > > > > __ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body.
Re: [AMRadio] Need help identifying National part
Hi John, I checked my Radio Parts Master catalogue for 1964, as well as the catalogue sections of the 1948 & 1940 ARRL RADIO AMATEUR'S HANDBOOK --- nothing, nil, zilch, nada... I wonder if that part number is really a National number, per se...? Perhaps it's the part number of the MANUFACTURER who originally purchased the part for his OEM application... Hammond Manufacturing did the same thing with their transformers: they were custom made on occasion for a specific end user in quantity, with a unique part number affixed to the transformer that meant nothing, specifically, to Hammond itself, once the contract ran out (or at least I've been told as much by a Hammond engineer). Good luck, in any event...! ~73~ Eddy VE3CUI - VE3XZ *** - Original Message - From: "John King" To: Sent: Friday, December 26, 2008 11:22 AM Subject: [AMRadio] Need help identifying National part > Have New Old Stock National part number SA1288. Appears to be a transformer with two spade bolts to bolt to chassis and has the National diamond emblem which has "NC" in the diamond. It is tar filled and has five black leads coming out of it. It is shaped like a LARGE IF can but has no adjusting screws or slots as it is completely enclosed. The dimensions are: > 4" H X 2 3/8" D X 1 15/16" W. It weighs about one pound. > > It is NEW and unused still in the National Box. > > Looks like a transformer of some sort such as an audio transformer from one of the "OLDER" National receivers that had considerable audio output for a receiver such as maybe a pair of 6V6 tubes or something of that nature. > > If you have the facilities to cross reference the part number, I would appreciate if if you would let me know what it is and which piece of National gear it was made for. > > Your help is appreciated. 73, John, K5PGW > > > > > __ > Our Main Website: http://www.amfone.net > AMRadio mailing list > Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ > List Rules (must read!): http://w5ami.net/amradiofaq.html > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > To unsubscribe, send an email to amradio-requ...@mailman.qth.net with > the word unsubscribe in the message body. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body.
[AMRadio] Need help identifying National part
Have New Old Stock National part number SA1288. Appears to be a transformer with two spade bolts to bolt to chassis and has the National diamond emblem which has "NC" in the diamond. It is tar filled and has five black leads coming out of it. It is shaped like a LARGE IF can but has no adjusting screws or slots as it is completely enclosed. The dimensions are: 4" H X 2 3/8" D X 1 15/16" W. It weighs about one pound. It is NEW and unused still in the National Box. Looks like a transformer of some sort such as an audio transformer from one of the "OLDER" National receivers that had considerable audio output for a receiver such as maybe a pair of 6V6 tubes or something of that nature. If you have the facilities to cross reference the part number, I would appreciate if if you would let me know what it is and which piece of National gear it was made for. Your help is appreciated. 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body.
