[Drake] TR-4C power output on 10m?

[Garey Barrell]

Dave -

A TR-4/C with good output tubes,

6JB6, Sylvania, RCA or GE

a good power supply

650 VDC under load, 260 VDC LV

and normal line voltage

120 - 125 VAC

Should put out

80M = 200W

40M = 200W

20M = 200W

15M = 175W

10M = 150W

Full power, (200W,) on the low bands but much lower than the above 
typically means soft finals.  I'm not sure just how you are measuring 
PEP, but the two-tone PEP output should be very close to the CW output 
if measured on an oscilloscope.  A meter that READS "PEP" is subject to 
too many variables to say.

Another possibility of course is a weak Driver tube, or any of several 
other tubes.  The only way to tell for sure is to substitute known good 
tubes, _one at a time_,  and confirm alignment.  IF your PEP figures ARE 
accurate, I'd check into the transmit ALC tube/circuit.

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B, C-Line&  TR-4/C Service Supplement CDs
<www.k4oah.com>


David Walker wrote:
> Hi folks,
>
> I have a Drake TR-4C.  The 10m band was not working so I used deoxit to
> clean the band switches and it seems to be working again.  I have only
> had this radio for 12 months or so.   What is the power output I should
> expect on 10m?
>
> I tune up with about 80w max and it puts out about 40w PEP and I have to
> use a fair bit of drive.  On the lower bands it tunes up to 200w and on
> SSB it puts out about 80w PEP.  Is that about right for this radio?
>
> Cheers,
>
> Dave
> VK2NA
> Newcastle, Australia
>
>