[BC] How would you build it?

James Potter jpotter at jpotter.com
Thu Jul 31 14:27:28 CDT 2014


Don:
Sounds like a tube compliment from the ARRL Radio Amateur's Handbook circa 1935.  I especially appreciate the link-coupling suggestion.  What about the neutralizing wire adjacent to the tube envelopes?

Re: 833s -- The Chicoms are very good imitators.  Wonder if there is a domestic requirement for them for those bottles?

However!  The 4CS250Bs made in China really stink. Their service life is weeks. 

I understand Romania or Bavaria (one of those -ia countries) makes a credible 807. That's advanced technology over there. They're skipping solid-state entirely and going directly to thermionic emission amplification devices that glow in the dark.  Reduces their heating and lighting bills in their transmitter shacks.

/J 

>-------- Original Message --------
>From: Donald Chester <k4kyv at hotmail.com>
>Pair of 849s in link-coupled push-pull final, modulated by another pair of 849s in class B.  Etc.

>BTW, you can still get new 833As, made in China (just like everything else). Reportedly, Chinese tube manufacturers have about made it through the learning curve and greatly improved QC; some of the Chinese tubes made now are said to be pretty good.



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