Re: [vcf-midatlantic] Does anyone know the substitute germanium transistor for a B1182
It’s a different package and I think in a lot of cases you can’t swap out germanium for silicon in older circuits so I’d prefer to stay with germanium. Cheers, Corey
On Jan 17, 2024, at 9:04 AM, Sentrytv via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
From: Sentrytv <sentrytv@yahoo.com> Subject: Re: [vcf-midatlantic] Does anyone know the substitute germanium transistor for a B1182 Date: January 17, 2024 at 9:04:36 AM EST To: Corey Cohen <corey@vcfed.org>, vcf-midatlantic <vcf-midatlantic@lists.vcfed.org>
According to NTE Electronics, B1182 OR 2sb1182 crosses over to an NTE 2527 PNP silicon complementary. Hi current switch. TO251 case
Sent from: My extremely complicated, hand held electronic device.
On Jan 17, 2024, at 8:46 AM, corey cohen via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
Hi,
Working on my dead ADM3a video, I realized I may need some spare parts before I start working on it.
I tried to find a cross-reference to B1182 transistor which is Q106 on the video board.
This is a Germanium transistor in what seems to be a TO-66 case.
Spent an hour Googling and can’t find a cross reference and no one seems to have them available in the correct Germanium.
Thanks, Cheers, Corey
MPS3731, which might be NTE127. “Show your work:” Tektronix used the same part in their 4023 terminal: (1) Q106 151-0483-00 TRANSISTOR:GERMANIUM,PNP 17954 B1182 The supplier code 17954 they have there is MIRATEL, DIV. BALL BROS RESEARCH CORP. … which isn’t real helpful, they didn’t make the part. But the Tektronix part number appears in their “Common Design Parts” catalog (2) https://w140.com/tekwiki/images/0/06/Semiconductors_Common_Design_Parts_Cata... <https://w140.com/tekwiki/images/0/06/Semiconductors_Common_Design_Parts_Catalog_1982.pdf> On page 9-14 they have a cross-reference that lists it as MPS3731. Page 6-22 has at least some of its specs to help match up. They say it’s a TO-3 case, which is similar but chonkier than a TO-66. The other specs imply that you do have to be careful matching it up… it’s good for 6 amps, 320 volts, but has a middling gain of 25, so the rest of the circuit was designed around that. That page says “do not use in new design!” so it was well obsolete by the time this catalog was printed in 1982. (1) https://bitsavers.org/pdf/tektronix/402x/070-1617-00_4023_Computer_Display_T... <https://bitsavers.org/pdf/tektronix/402x/070-1617-00_4023_Computer_Display_Terminal_Service_Manual_May81.pdf> — Jameel Akari
On Jan 17, 2024, at 10:02 AM, corey cohen via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
It’s a different package and I think in a lot of cases you can’t swap out germanium for silicon in older circuits so I’d prefer to stay with germanium.
Cheers, Corey
On Jan 17, 2024, at 9:04 AM, Sentrytv via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
From: Sentrytv <sentrytv@yahoo.com> Subject: Re: [vcf-midatlantic] Does anyone know the substitute germanium transistor for a B1182 Date: January 17, 2024 at 9:04:36 AM EST To: Corey Cohen <corey@vcfed.org>, vcf-midatlantic <vcf-midatlantic@lists.vcfed.org>
According to NTE Electronics, B1182 OR 2sb1182 crosses over to an NTE 2527 PNP silicon complementary. Hi current switch. TO251 case
Sent from: My extremely complicated, hand held electronic device.
On Jan 17, 2024, at 8:46 AM, corey cohen via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
Hi,
Working on my dead ADM3a video, I realized I may need some spare parts before I start working on it.
I tried to find a cross-reference to B1182 transistor which is Q106 on the video board.
This is a Germanium transistor in what seems to be a TO-66 case.
Spent an hour Googling and can’t find a cross reference and no one seems to have them available in the correct Germanium.
Thanks, Cheers, Corey
Thanks, I’ll start seeing if the data sheets match in spec once I can find a good copy of the B1182 since it is not officially listed as a cross with NTE127 of MPS3731 in any of my quick good searches. I wonder if the note about don’t use the newer design is related to silicon vs germanium. I think NTE is the only ones to still make germanium transistors. Cheers, Corey corey cohen uǝɥoɔ ʎǝɹoɔ Sent from my iPhone
On Jan 17, 2024, at 11:18 AM, Jameel Akari via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
MPS3731, which might be NTE127.
“Show your work:”
Tektronix used the same part in their 4023 terminal: (1)
Q106 151-0483-00 TRANSISTOR:GERMANIUM,PNP 17954 B1182
The supplier code 17954 they have there is MIRATEL, DIV. BALL BROS RESEARCH CORP. … which isn’t real helpful, they didn’t make the part.
But the Tektronix part number appears in their “Common Design Parts” catalog (2) https://w140.com/tekwiki/images/0/06/Semiconductors_Common_Design_Parts_Cata... <https://w140.com/tekwiki/images/0/06/Semiconductors_Common_Design_Parts_Catalog_1982.pdf>
On page 9-14 they have a cross-reference that lists it as MPS3731.
Page 6-22 has at least some of its specs to help match up. They say it’s a TO-3 case, which is similar but chonkier than a TO-66. The other specs imply that you do have to be careful matching it up… it’s good for 6 amps, 320 volts, but has a middling gain of 25, so the rest of the circuit was designed around that.
That page says “do not use in new design!” so it was well obsolete by the time this catalog was printed in 1982.
(1) https://bitsavers.org/pdf/tektronix/402x/070-1617-00_4023_Computer_Display_T... <https://bitsavers.org/pdf/tektronix/402x/070-1617-00_4023_Computer_Display_Terminal_Service_Manual_May81.pdf>
— Jameel Akari
On Jan 17, 2024, at 10:02 AM, corey cohen via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
It’s a different package and I think in a lot of cases you can’t swap out germanium for silicon in older circuits so I’d prefer to stay with germanium.
Cheers, Corey
On Jan 17, 2024, at 9:04 AM, Sentrytv via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
From: Sentrytv <sentrytv@yahoo.com> Subject: Re: [vcf-midatlantic] Does anyone know the substitute germanium transistor for a B1182 Date: January 17, 2024 at 9:04:36 AM EST To: Corey Cohen <corey@vcfed.org>, vcf-midatlantic <vcf-midatlantic@lists.vcfed.org>
According to NTE Electronics, B1182 OR 2sb1182 crosses over to an NTE 2527 PNP silicon complementary. Hi current switch. TO251 case
Sent from: My extremely complicated, hand held electronic device.
On Jan 17, 2024, at 8:46 AM, corey cohen via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
Hi,
Working on my dead ADM3a video, I realized I may need some spare parts before I start working on it.
I tried to find a cross-reference to B1182 transistor which is Q106 on the video board.
This is a Germanium transistor in what seems to be a TO-66 case.
Spent an hour Googling and can’t find a cross reference and no one seems to have them available in the correct Germanium.
Thanks, Cheers, Corey
-- Jameel Akari
On Jan 17, 2024, at 2:26 PM, corey cohen <coreyvcf@gmail.com> wrote:
Thanks,
I’ll start seeing if the data sheets match in spec once I can find a good copy of the B1182 since it is not officially listed as a cross with NTE127 of MPS3731 in any of my quick good searches.
Yeah I didn’t have time this morning to search the other way or match specs. It is possible there’s only a “close enough” match.
I wonder if the note about don’t use the newer design is related to silicon vs germanium. I think NTE is the only ones to still make germanium transistors.
I think what Tektronix was saying there is that while they used it and probably had spares, it was simply obsolete and/or out of production by then. It made sense when the design was new, and as part of a non-critical raster CRT assembly it wouldn’t be surprising if they (or the subassembly supplier) just kept making them the same way once they had a good-enough design. /jka
Cheers, Corey
corey cohen uǝɥoɔ ʎǝɹoɔ Sent from my iPhone
On Jan 17, 2024, at 11:18 AM, Jameel Akari via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
MPS3731, which might be NTE127.
“Show your work:”
Tektronix used the same part in their 4023 terminal: (1)
Q106 151-0483-00 TRANSISTOR:GERMANIUM,PNP 17954 B1182
The supplier code 17954 they have there is MIRATEL, DIV. BALL BROS RESEARCH CORP. … which isn’t real helpful, they didn’t make the part.
But the Tektronix part number appears in their “Common Design Parts” catalog (2) https://w140.com/tekwiki/images/0/06/Semiconductors_Common_Design_Parts_Cata... <https://w140.com/tekwiki/images/0/06/Semiconductors_Common_Design_Parts_Catalog_1982.pdf>
On page 9-14 they have a cross-reference that lists it as MPS3731.
Page 6-22 has at least some of its specs to help match up. They say it’s a TO-3 case, which is similar but chonkier than a TO-66. The other specs imply that you do have to be careful matching it up… it’s good for 6 amps, 320 volts, but has a middling gain of 25, so the rest of the circuit was designed around that.
That page says “do not use in new design!” so it was well obsolete by the time this catalog was printed in 1982.
(1) https://bitsavers.org/pdf/tektronix/402x/070-1617-00_4023_Computer_Display_T... <https://bitsavers.org/pdf/tektronix/402x/070-1617-00_4023_Computer_Display_Terminal_Service_Manual_May81.pdf>
— Jameel Akari
On Jan 17, 2024, at 10:02 AM, corey cohen via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
It’s a different package and I think in a lot of cases you can’t swap out germanium for silicon in older circuits so I’d prefer to stay with germanium.
Cheers, Corey
On Jan 17, 2024, at 9:04 AM, Sentrytv via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
From: Sentrytv <sentrytv@yahoo.com> Subject: Re: [vcf-midatlantic] Does anyone know the substitute germanium transistor for a B1182 Date: January 17, 2024 at 9:04:36 AM EST To: Corey Cohen <corey@vcfed.org>, vcf-midatlantic <vcf-midatlantic@lists.vcfed.org>
According to NTE Electronics, B1182 OR 2sb1182 crosses over to an NTE 2527 PNP silicon complementary. Hi current switch. TO251 case
Sent from: My extremely complicated, hand held electronic device.
On Jan 17, 2024, at 8:46 AM, corey cohen via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
Hi,
Working on my dead ADM3a video, I realized I may need some spare parts before I start working on it.
I tried to find a cross-reference to B1182 transistor which is Q106 on the video board.
This is a Germanium transistor in what seems to be a TO-66 case.
Spent an hour Googling and can’t find a cross reference and no one seems to have them available in the correct Germanium.
Thanks, Cheers, Corey
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Jameel Akari