[Milsurplus] PRC-47

Sun, 28 Apr 2002 01:34:59 -0500

Hi,

There is a special cooling unit (fan) that goes on the PRC-47 to keep things
cool when using RTTY.  It does look as if Collins is pushing the tube a bit
though.  Especially in RTTY mode where the duty cycle is so hi.  Just a
thought.  Left the other data on in case some one is just getting this
thread.

73s  John  WD5ENU/A45XV

-----Original Message-----
From: Don Reaves W5OR [mailto:[email protected]]
Sent: Sunday, April 28, 2002 9:12 AM
To: H. O. Tyler; [email protected]
Subject: RE: [Milsurplus] PRC-47

H.O.,

From "Transmitting Tubes for Linear Amplifier Service", a paper presented 
at the the 1956 National Convention of Institute of Radio Engineers:
zero-supressor-voltage type beam pentode
PL-177  Fil. [email protected] 75W Max. Plate  Class AB1 Output 96W at1KV, 
140(ICS)@1.5KV, 200(ICS)@2.0KV.

If Collins designed the transmitter for low duty cycle that could explain
running 1500 volts on the plate!

Sorry I don't have a full data sheet from Penta.   

Sibley says PL-177 is 4-125 format but all glass,
alternate to Westinghouse 6549

Don W5OR

> for a source of data on the tube line-up in the PRC-47:  5907, 7761, 7905
> and PL-177.

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