[Boatanchors] 1625 osc xmtr Why not 6AG7 osc and 1625 P.A. ?

BLIMPY blimpboy at sonic.net
Mon Nov 17 18:02:02 EST 2008


Any of the osc type transmitters in old ARRL handbooks ( 5''s and 60's ) 
designed for 6v6, 6L6, or 6AG7  can be used with 807  or 1625.. without much 
difficulty.

but " low power "  with a 1625 ?

as an oscillator that  tube will run way more than 60 watts depending on the 
power supply.
a keyed oscillator is never a very wonderful cw rig...simple and effective, 
sure.

May I ask why not use the Total Classic aproach ...  a 6AG7 osc driving a 
1625 / 807   as a class C final ?

only a few more parts... still could be built on a pine board if you had 
to... but miles better transmitter.
no chirp, no clicks.

These were marketed as Johnson Adventurer, Knight Kit 50 Watt Transmitter, 
with a 5U4 rectifier.
you can use diodes cheaply today for the recitfier to save money... or you 
could run it off a heathit hp-23 supply.
the 300v will run it fine at 35+ watts input.

BAMA has docs for Johnson Adventurer
and probably also for the Ameco novice transmitter.. a classic keyed 
oscillator xmtr using 6v6 / 6L6.

btw.. 6L6 will run 17 watts output on cw.  used metal ones can be found 
cheaply still.

Not that I dont love 1625's cause I do.




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