I got a kit similar to this years ago, and it is missing the TIP41. No other details about the part. I see this component listed online, but various versions...not sure if any of them will work, or if I need a specific version of it (the letters following the TIP41). Would appreciate any help you can give!
The kit has a PCB similar to this, but this has different values:
$9.75 - Tesla Coil Kit 15W Soldering Kit - Tinkersphere
This is the diagram for the actual kit I have:
Thanks!
The kit has a PCB similar to this, but this has different values:
$9.75 - Tesla Coil Kit 15W Soldering Kit - Tinkersphere
This is the diagram for the actual kit I have:

Thanks!
There are several different voltage ratings, but the price is about the same.
I would just get the 100V version (CG).
tip41 | Octopart
https://docs.rs-online.com/81c9/0900766b811a6603.pdf
I would just get the 100V version (CG).
tip41 | Octopart
https://docs.rs-online.com/81c9/0900766b811a6603.pdf
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There are several different voltage ratings, but the price is about the same...
I distinctly recall same base TIP number was A=$3, B=$4, and C=$7 if you could get it.
But things change over 45+ years....
TIP41A $1.20 NTE Electronics, Inc
TIP41B $0.92 NTE Electronics, Inc
TIP41C $1.04 NTE Electronics, Inc
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Mouser sells TIP41C for 81 cents each or 72 cents in lots of ten. Lower if you buy large amounts.
TIP42B is sold at same price.
TIP42B is sold at same price.
These were always the same part, just graded based on sample testing of the wafers. The process is inherently capable of 100+ volts theses days. The only reason to use the other grades is if production documentation REQUIRES the A or B version, and too many auditors are looking.
Or if you happen to find NOS for pennies on the dollar, AND can verify then as real before bulk purchase. Do not do this if you just need one or two or even a dozen, or if you’re in serious production - add them to a Mouser order.
Or if you happen to find NOS for pennies on the dollar, AND can verify then as real before bulk purchase. Do not do this if you just need one or two or even a dozen, or if you’re in serious production - add them to a Mouser order.
Time fliesI distinctly recall same base TIP number was A=$3, B=$4, and C=$7 if you could get it.
But things change over 45+ years....

I remember when resistors could be ordered in 20 - 10 - 5 % tolerance there was a significant difference between them.
5% was PREMIUM.
1%?
Unheard of outside Labs. 😱😱
Metal film is very repeatable, so 1% is normal, 0.1% isn't too tricky. Metal oxide and carbon were inherently less repeatable as they are made from a slurry and rely on particle-particle contact.
TIP41 is a TIP41
Pretty basic Medium Power General purpose Transistor made by Texas Instruments Back in the day.
Texas Instruments Power ( TIP )
Usually any other prefix might be modern if its PB free or not.
Otherwise Original A, B, C Suffix shows voltage tolerance.
As mentioned go for the 100 volt
Tip41 = 40 volt
Tip41A = 60 volt
Tip41B = 80 volt
Tip41C =100 volt
Pretty basic Medium Power General purpose Transistor made by Texas Instruments Back in the day.
Texas Instruments Power ( TIP )
Usually any other prefix might be modern if its PB free or not.
Otherwise Original A, B, C Suffix shows voltage tolerance.
As mentioned go for the 100 volt
Tip41 = 40 volt
Tip41A = 60 volt
Tip41B = 80 volt
Tip41C =100 volt
Well, yes, today.
Way back then we were proud about having left carbon composition resistors behind 😉
Way back then we were proud about having left carbon composition resistors behind 😉
Back in those days they were very proud of power transistors over 60 volts too. B and C types were priced accordingly, as were “real” types good for over 100. They quickly got ridiculous, especially the PNP’s. And places that sold the higher voltage types wouldn’t typically do retail business so we were stuck with the crap.
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