[Hallicrafters] HT37 plate voltage

[Mark Bell]

Both my HT-37 and HT-32 manuals give values of 70 
to 100 W output on CW.

A year or so ago, I made the following measurements
(according to my notes...)

HT-37 (85W measured output):
    Key Up - 730V
           Dn - 580V

If one uses a figure of 70% efficiency, that would
be about 210 ma of plate current.

HT-32 (90W measured output)
    Key Up - 755V
           Dn - 640V

If one uses a figure of 70% efficiency, that would
be about 200 ma of plate current.

Msmts were with an 11M input VTVM, power measured
via an HM-102,  50 Ohm Cantanna for the load.

73 Mark K3ZX

> You should be taking the voltage reading when in the
> CW "key down" position so that the final amplifier
> tubes are drawing the most current.  I think that 6K
> ohm will be way too much.  You should have around 750
> to 800 volts under load (144 watts input on CW if I
> remember my HT-37 specifications).
> 
> Glen, K9STH
> 
> 
> --- Randy & Jazz <ve7hrg at uniserve.com> wrote:
> 
> I had 850vdc on the plate choke in mox mode. A 6K 5
> watt res. brought the voltage down to 750vdc(in the
> mox mode). Is this the mode I should be taking the
> voltage readings in?
> 
> Second Question;With all that voltage available ,
> could 6146As be used?
> 
> 
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Sports - Coverage of the 2002 Olympic Games
> http://sports.yahoo.com
> _______________________________________________
> List Administrator: Duane Fischer, W8DBF **for assistance**
> dfischer at usol.com
> ----
> Hallicrafters Collectors International: http://www.w9wze.org
> ----
> http://mailman.qth.net/mailman/listinfo/hallicrafters
>