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palomar 400 high drive
- Thread starter donemad
- Start date
This is what is shown on cbtricks
http://www.cbtricks.com/Amp/palomar_other/400/palomar_400_sch.pdf
http://www.cbtricks.com/Amp/palomar_other/elite/pal_hd400.gif
http://www.cbtricks.com/Amp/palomar_other/400/palomar_400_sch.pdf
http://www.cbtricks.com/Amp/palomar_other/elite/pal_hd400.gif
I would try to keep the forward drive below 30 watts pep. You could drive it with a little more but it will damage the resistors used on the hi/med/low switch and will over drive the amplifier anyway.
Not unless the 3749's are a close match to the 2879, no it's not common practice to mis-match devices like that.
No, thats not gonna work at all. Some one has swapped in a 2879 for a 3749 and thats not a good idea. Good luck with that one. I don't even think 3749s are correct.
" That would work if the 2879 is being used to drive the 3 other transistors."
Say what?? No such thing as a one pill driving three. Sorry.
" That would work if the 2879 is being used to drive the 3 other transistors."
Say what?? No such thing as a one pill driving three. Sorry.
That would require a very large wattage resistor to balance the output stage with the single resistor, cheaper to just add another transistor.lol
Schematics shown for this amp and I believe dwb showed us 2 show that amp using either sd-1446 or MRF455 transistors so obviously it has already been modified or is another version that we've not seen a schematic for.
I made a 3 pill one time with 3 1 pill sections like the 1 toshiba specs for a test circuit and combined it with wilkinson style combiners.
Yea, I could have stated that different since a skilled person could build something like that. It seems as a general rule amplifiers have even numbers of pills at the final stage.
Bottom line on that Palomar is none of those pills were there when it was new. I did have a Galaxy 225 once that had two 3749's.
Bottom line on that Palomar is none of those pills were there when it was new. I did have a Galaxy 225 once that had two 3749's.
i can honestly say thats the first time ive ever heard of that transistor
but 1 driving 3 REALLY come on that should set off alarms in everyones head as something is AFU
but 1 driving 3 REALLY come on that should set off alarms in everyones head as something is AFU
...runna pile-up on 6m SSB