[Heathkit] Hot Water 101 Final Question

[Michael Waldrop]

Have you tried adjusting the bias control to lower the idle plate current to zero?
If so, what were the results? If the plate current now shows zero in TUNE
and sideband mode, you now have control over the finals.

Have you put the original tubes back in the radio? If so, do you have the
same problem? If not then one or both of the replacement tubes are bad.

These steps should be taken first.

I also wonder what the meter is pointing at to indicate 90ma. Is the meter
pointing to number "9"? If so, that's not 90ma but rather 150ma. This is
based on the metering resistors, both 470 ohm resistors on the meter
switch, checking good.

73
Mike
W5RKL


Bwana Bob <wb2vuf at gti.net> wrote: Bill:

6146A should work fine.  Supposedly, at one time there were problems 
with the 6146B. First do the bias adjustment to get the idling plate 
current down to 50 mA, then do the neutralization adjustment.  My guess 
is that the finals are oscillating.  Neutralization should fix that.


     73,

     Bob WB2VUF

William Aycock wrote:
> Fellow Heathkittens,
> I have a HW 101 and just replaced some bad 6146 finals with some 6146As 
> from Sylvania.  With the 6146As, the plate current is all haywire.  When 
> you place it in Tune, the plate current is about 90 milliamps with no 
> drive.  Key the mike and the plate current pegs the needle. Has anyone 
> experienced anything like this?  The only thing that I can think of is 
> that the 6146A is not a direct replacement for the 6146 although the 
> Heathkit manual for the HW 101 said that either may be used.
> 
> Help!!!! and Thanks,
> Bill KC5MN
> 
>