[Collins] Collins PTO/T-368

[Gerald]

On Tue, 2005-05-31 at 11:12 -0500, Gerald wrote:
> On Tue, 2005-05-31 at 07:25 -0300, David Knepper wrote:
> > I picked up two of these PTOs that are used in the T-368.
> > 
> > Looking for a schematic, particularly, the pin connections, i..e., voltages
> > required.
> > 
> > I see that there is a conversion article on the Internet to retrofit the
> > unit to solid-state.
> > Any other ideas on their use.  Thought that I would try to get one working
> > with my Collins 20V-3, which incidentally is for sale.
> > 
> > Thank you.
> > 
> > David, W3ST
> 
> There might be a T368 schematic on line. I've never looked. By the
> tables I've downloaded (that match a document I have) the T368 PTO is a
> 70H-9. Tunes 1.5 to 3 MHz, takes 6.3 for heater, ten turns, B+ 150 volts
> 12 ma. 28 volts for the oven. One sheet says 5 volts open circuit
> output. That might be low for driving a vintage crystal oscillator.
> 
> There should be minimal resistance (100 ohms or so) between the screen
> or plate pins of the output tube to the B+ feed, and none from the
> ungrounded heater pin to the hot heater wire (both tubes pulled).

http://bama.edebris.com/manuals/military-kg7bz/t368/

or http://bama.sbc.edu
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer