[Milsurplus] Re: BC375 805s for 211 modulators
Unserviceable but Repairable
cosmoline at ba-watch.org
Wed Jun 8 07:44:36 EDT 2005
Was: More on BC375 Tube Subbing*
211 a lo amp-factor (10) critter per '57 hdbk.
805 is same. But has plate cap which is no impediment in modulators.
Just paint caps black & run poly wire to 'em behind the tubes. EXACT
electrical swap.
838 amp factor not given there but fine grid-pitch makes them
look like hi-mu 811s or 572Bs. And someone here proposed they might
be sub'd for 211s running at zero rather than neg. bias (as pot 1113
sets in BC-191). So conditionally a good modulator 211 exchanger.
There were a blue mil 805s in surplus & outside of scarce T350XM, don't
know where they went. 838s were finals in giant shipboard 'Battle Announcer'
Stromberg built for Navy & fewer in circulation than 805s.
Anyway - Tempe place advertises these prices
211/VT4C $195
805 $105
838 $61
& DaveS sez Chinese 211 clones $30. If ya gotta buy 'em, nolo contendere.
Note all are 10V 3.25A filaments. Much needed with all series
resistors to get 'em going off 14 or 28VDC in a '191 or '375.
'rm
* for the dyslexic, consider "moron tube subbing"
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