[Boatanchors] DX-35 help needed

[Clarke, Tom AIR4.0P NATOPS]

Hi Doc,
My guess is that the Oscillator and buffer are in "series" B+ wise.  B+ to the buffer then goes to the oscillator via the cathode of the buffer.  Clever way to eliminate low B+ supply.  Just a wag at this end as I am not familiar with the -35. 
73 Tom/W4OKW

Tom Clarke
Wyle Labs,  Aeronautics
NATOPS Program Support Specialist
USN/USMC National Airworthiness Office
Naval Air Systems Command, AIR-4.0P
(301) 995-3793/DSN 995-3793
Fax: (301) 757-6599
Cell (301) 904-2053
frederic.clarke at navy.mil


-----Original Message-----
From: WØQFC [mailto:erastber at tampabay.rr.com] 
Sent: Sunday, March 08, 2009 14:51
To: FLBOATANCHORS at yahoogroups.com; boatanchors at mailman.qth.net
Subject: [Boatanchors] DX-35 help needed




Looking at the schematic, the filament wiring for the 12BY7(buffer) shows
that pins 1, 3, 4 & 5 are tied together and go to "X" on the power tranny;
also goes thru a 47K to pin 2, thru a 470 to the switch & 40M coil, thru a
27K to pin 8 of the 12BY7 oscillator and thru a 47K to pin 7 of the
oscillator.

Questions:

 Why would the filament be tied to the cathode and grid of the buffer?
 Why would the filament be tied to the grid and plate of the oscillator?
 How would the oscillator get it's plate and screen voltages?

I am unable to dip the final and I believe it is because there is no drive
to the final grid because there is no plate and screen voltage on the
oscillator..

Your help and thoughts will be appreciated!

TIA
Gene, WØQFC

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