| Author |
Message |
    
Drfeelgood
Junior Member
Username: Drfeelgood
Post Number: 23
Registered: 3-2003
| | Posted on Tuesday, January 04, 2005 - 9:54 am: | 
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what would be a better replacement part for the 2sa1869 audio driver. anyone have any ideals.
thanks. |
Tech808
Moderator
Username: Tech808
Post Number: 4465
Registered: 8-2002
| | Posted on Tuesday, January 04, 2005 - 1:54 pm: |
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Drfeelgood,
You can use a 2SA-1012 in place of the 2SA-1869
Hope this helps,
Lon
Tech808
CEF808
N9OSN |
Drfeelgood
Junior Member
Username: Drfeelgood
Post Number: 24
Registered: 3-2003
| | Posted on Tuesday, January 04, 2005 - 4:50 pm: |
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hello 808
i was just looking for a beter audio driver then the 2sa1869 thats in the galaxys now if there is one? i'll have to check the specs on the 2sa1012.
thanks. |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 107
Registered: 9-2004
| | Posted on Wednesday, January 05, 2005 - 2:56 pm: |
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drfeelgood, take lon's advice, the 2sa1012 is an upgrade from the 2sa1869. |
Sg569
Member
Username: Sg569
Post Number: 52
Registered: 12-2004
| | Posted on Saturday, January 22, 2005 - 1:43 pm: |
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Just wondering how good NTE transistors are?
I have been looking for finals for my XL( yes, I fried them). I found out that NTE covers both the 2sc1969 and 2sc2166 with one number( NTE 236). Would there be any problems with this swap??
I want to make sure before I go spend $10 a pop.
Thanks Walter |
Tech808
Moderator
Username: Tech808
Post Number: 4599
Registered: 8-2002
| | Posted on Saturday, January 22, 2005 - 2:33 pm: |
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Sg569,
Try:
http://www.rfparts.com/
The 2SC1969 Finals are getting harder and harder to find as they have been discontinued and some places have doubled in price in the last year.
The NTE Products are good replacements when you are unable to find others.
Lon
Tech808
CEF808
N9OSN |
Sg569
Member
Username: Sg569
Post Number: 53
Registered: 12-2004
| | Posted on Saturday, January 22, 2005 - 3:13 pm: |
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Thanks 808,
I can get the nte236 locally, so I probably will go and pick a few up on monday. Boy I miss my XL.
Walter |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 158
Registered: 9-2004
| | Posted on Saturday, January 22, 2005 - 8:53 pm: |
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how can they work if they are the same part number? this doesnt make sense to me. the gain characteristics of these transistors is different. im confused.
matt |
Sg569
Member
Username: Sg569
Post Number: 55
Registered: 12-2004
| | Posted on Sunday, January 23, 2005 - 11:06 am: |
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Kid, if you look at the specs. on the 2sc1969, 2sc2166, and the nte236. You should notice that the specs. for the c1969, and the nte236 are dang near identical, they both have an output of 10-14 watts for class ab amps. The c2166 has a power output of only 3-4 watts. The way I am seeing all this is that the c2166 is a pre-driver, and the c1969 is the true final driver. So lets say that we used two nte236 trans. the only prob. that I see would be the final bias would probly have to be tweaked a little. The end result should be (in theory) that you have a little more output. Again as I am seeing it. I suppose that if you really wanted to get closer to the c2166 one could use a nte235, yet it would be a little short.
Again Kid, look at the specs. That's all I can really say, Maybe one of the techs here could clarify this, I think that I might have muddled this up.
Hey Kid, Thanks for making me think about that one.
Walter |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 160
Registered: 9-2004
| | Posted on Sunday, January 23, 2005 - 2:31 pm: |
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i guess that makes sense. i would have thought that the nte 235 would be the propeer replacement. i have not looked at the specs of these devices, so i cant say for sure. if it were me, id go through RF parts co. they have the 1969's and 2166's. i am a fan of motorola finals and drivers. if you want some parts that will never blow on you, get the MRF 475, 476 combo. a little less gain, but a much stronger part. good to know about the nte's though. |
Chad
Intermediate Member
Username: Chad
Post Number: 101
Registered: 11-2004
| | Posted on Sunday, January 23, 2005 - 9:43 pm: |
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If I repair someting with NTE's and it comes back I know right where to look. In low stress situations they are OK but if money depends on it I try my hardest to get the original or a reputable cross. |
Sg569
Member
Username: Sg569
Post Number: 58
Registered: 12-2004
| | Posted on Wednesday, January 26, 2005 - 10:34 am: |
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KV,
Thanks for the mrf # I might really consider them
I understand about Motorola, though.I guess it all come down to availibility, cost and performance. Speed costs money, how fast do you want to go??
Chad, you don't seem to care for Nte very much, just a personal opinion? Or have you had problems with Nte parts?
Thanks,
Walter |
Sg569
Member
Username: Sg569
Post Number: 62
Registered: 12-2004
| | Posted on Wednesday, January 26, 2005 - 2:18 pm: |
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Hey Kid,
I think I'll Follow your advice, and say heck w/ it, I'm going through rf parts co.4 Trans.(2 2sc2166 and 2 2sc1969), 20ft. of 9913 coax (sorry tech 833, I couldn't find it in coppers), and 2 silver pl259s, They ship to my homefor under $50.
( Running around home naked all day long...
Priceless)
;) lol |
Grts
New member
Username: Grts
Post Number: 4
Registered: 12-2002
| | Posted on Thursday, January 27, 2005 - 10:51 am: |
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I've yet to see an export type radio with NTE transistors in the RF final section produce the correct peak power. One of the most important specs on the datasheet to compare is the Hfe number which is gain. This is especially important in the modulation and RF circuits. |
