I have this old radio and it dosent have final or driver I have 2 1969's so iput one in it but no have driver can I use a c2075 or c2078 in place of 2166 driver or a 2029 final out of a 29 to drive this 1969 ? thanks for any info....
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need info for cobra 148
- Thread starter sanjosebay21
- Start date
IIRC, the 2sc2166 is used in this chassis because the circuit is built around AB biasing. The other transistors you listed are used for class B biasing. So those other transistors may work; but are not really the right part for that radio. You can buy a real 2166 at PacificSemi or RF Parts. I would use a 2166; but there may be an exact/equivalent transistor for it. Think the NTE-235 will work.
Don't ever buy it from ebay; most of them are counterfeits.
Don't ever buy it from ebay; most of them are counterfeits.
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Don't know if RS carries NTE products; but I know that Fry's Electronics does . . .
went to the shack yes they had it luckily but the nte235 cross references to a c2078 and c2029 and c2166
Might be that the NTE-235 supersedes the 2029 & 2078. Some guys will modify Cobra 29's with a 2166/1969 set to improve output power. Go ahead and try that transistor that you got. Remember to use an insulator between the transistor and use thermal paste too. After all that, you will need to set the driver and final bias with a mA meter.
ExitThirteen and other members knows these parts far better than I do; they may yet weigh in too . . .
ExitThirteen and other members knows these parts far better than I do; they may yet weigh in too . . .
Hi, 2SC2078 = NTE235, 2SC1969 or 2SC2166 = NTE236.
Personally, I don't use replacements for outputs. Output power "could vary". In the other hand, replacement are far better than nothing. For everything else replacements are fine.
Don't use thermal paste in excess. Just the needed to cover the metal imperfections (heat sink and transistor tab).
:headbang
Greetings from the Caribbean!!!!
Personally, I don't use replacements for outputs. Output power "could vary". In the other hand, replacement are far better than nothing. For everything else replacements are fine.
Don't use thermal paste in excess. Just the needed to cover the metal imperfections (heat sink and transistor tab).
:headbang
Greetings from the Caribbean!!!!
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If you haven't installed the NTE-235 yet, please take a good close up picture of it and post it here. I can tell by the case style what it is.
A C2075 and a C2078 will not work in a SSB radio. They will get hot and/or not produce hardly any output. You cannot bias them properly with the existing bias circuitry in the radio. Your best bet is to get a genuine Mitsubishi C2166 if possible for best performance. The NTE-235 could work, depending on what they use for the actual transistor.
2SC2166 RF Power Transistor 12 5 Watts by Mitsubishi | eBay
The above link is for genuine Mitsubishi C2166 transistors.
~Cheers~
A C2075 and a C2078 will not work in a SSB radio. They will get hot and/or not produce hardly any output. You cannot bias them properly with the existing bias circuitry in the radio. Your best bet is to get a genuine Mitsubishi C2166 if possible for best performance. The NTE-235 could work, depending on what they use for the actual transistor.
2SC2166 RF Power Transistor 12 5 Watts by Mitsubishi | eBay
The above link is for genuine Mitsubishi C2166 transistors.
~Cheers~
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